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Roger J Smith

Daily C.E.T. Average Values 1772-2011

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With 240 years of daily Central England Temperature (C.E.T.) data (except for missing Dec 1786), I have constructed a computer file that can generate many items of interest.

First up, the mean daily C.E.T. values for the entire 240-year period, rounded to 2 decimals.

DATE ... MONTH

<<>> ... JAN .... FEB .... MAR .... APR .... MAY .... JUN .... JUL .... AUG .... SEP .... OCT .... NOV .... DEC**

01 ..... 3.28 .... 3.90 .... 4.56 .... 6.79 .... 9.49 .. 13.29 .. 15.48 .. 16.11 .. 14.65 .. 11.83 .... 7.98 .... 5.04

02 ..... 3.28 .... 3.85 .... 4.78 .... 6.98 .... 9.74 .. 13.56 .. 15.60 .. 16.08 .. 14.82 .. 11.65 .... 7.93 .... 4.96

03 ..... 3.13 .... 3.97 .... 4.74 .... 6.95 .... 9.82 .. 13.57 .. 15.56 .. 16.10 .. 14.67 .. 11.54 .... 7.74 .... 5.00

04 ..... 3.33 .... 3.99 .... 4.67 .... 7.07 .... 9.90 .. 13.72 .. 15.67 .. 16.10 .. 14.51 .. 11.39 .... 7.42 .... 5.05

05 ..... 3.20 .... 4.10 .... 4.76 .... 7.11 .. 10.15 .. 13.72 .. 15.83 .. 16.17 .. 14.49 .. 11.14 .... 7.45 .... 5.12

06 ..... 3.32 .... 4.13 .... 4.93 .... 7.29 .. 10.31 .. 13.70 .. 15.73 .. 16.02 .. 14.47 .. 11.22 .... 7.08 .... 4.78

07 ..... 3.13 .... 4.24 .... 4.95 .... 7.43 .. 10.51 .. 13.75 .. 15.78 .. 15.99 .. 14.42 .. 11.14 .... 6.89 .... 4.55

08 ..... 3.20 .... 3.98 .... 4.84 .... 7.36 .. 10.56 .. 13.78 .. 15.75 .. 15.99 .. 14.28 .. 10.92 .... 6.79 .... 4.34

09 ..... 3.32 .... 3.94 .... 4.64 .... 7.25 .. 10.45 .. 13.92 .. 15.77 .. 16.00 .. 14.11 .. 10.74 .... 6.56 .... 4.16

10 ..... 3.41 .... 3.94 .... 4.84 .... 7.52 .. 10.56 .. 13.84 .. 15.88 .. 16.08 .. 13.98 .. 10.91 .... 6.63 .... 4.25

11 ..... 3.29 .... 3.81 .... 5.07 .... 7.65 .. 10.79 .. 13.94 .. 16.09 .. 16.10 .. 13.93 .. 10.63 .... 6.78 .... 4.14

12 ..... 3.07 .... 3.72 .... 4.96 .... 7.72 .. 11.12 .. 14.04 .. 16.23 .. 16.19 .. 13.67 .. 10.37 .... 6.49 .... 4.32

13 ..... 3.32 .... 3.63 .... 5.03 .... 7.65 .. 11.11 .. 14.19 .. 16.29 .. 16.11 .. 13.57 .. 10.11 .... 6.32 .... 4.44

14 ..... 3.35 .... 3.71 .... 5.26 .... 7.99 .. 11.17 .. 14.18 .. 16.28 .. 16.02 .. 13.45 .. 10.13 .... 6.03 .... 4.43

15 ..... 3.24 .... 3.96 .... 5.44 .... 8.27 .. 11.15 .. 14.27 .. 16.24 .. 15.89 .. 13.37 .... 9.93 .... 5.86 .... 4.34

16 ..... 3.39 .... 3.89 .... 5.63 .... 8.21 .. 11.29 .. 14.31 .. 16.18 .. 15.73 .. 13.40 .... 9.63 .... 5.72 .... 4.26

17 ..... 3.38 .... 3.74 .... 5.67 .... 8.12 .. 11.35 .. 14.47 .. 16.12 .. 15.70 .. 13.51 .... 9.72 .... 5.48 .... 4.34

18 ..... 3.34 .... 3.73 .... 5.75 .... 8.19 .. 11.33 .. 14.50 .. 16.18 .. 15.75 .. 13.27 .... 9.62 .... 5.58 .... 4.30

19 ..... 3.48 .... 3.75 .... 5.73 .... 8.32 .. 11.35 .. 14.54 .. 16.19 .. 15.69 .. 13.01 .... 9.54 .... 5.57 .... 3.97

20 ..... 3.32 .... 3.72 .... 5.96 .... 8.54 .. 11.62 .. 14.68 .. 16.20 .. 15.64 .. 12.84 .... 9.36 .... 5.46 .... 3.85

21 ..... 3.50 .... 4.14 .... 5.90 .... 8.92 .. 11.77 .. 14.73 .. 16.12 .. 15.51 .. 12.54 .... 9.41 .... 5.57 .... 3.88

22 ..... 3.57 .... 4.36 .... 5.92 .... 8.95 .. 11.96 .. 14.87 .. 16.10 .. 15.47 .. 12.59 .... 9.27 .... 5.45 .... 3.85

23 ..... 3.52 .... 4.49 .... 6.05 .... 8.95 .. 12.23 .. 14.81 .. 16.11 .. 15.21 .. 12.52 .... 9.00 .... 5.48 .... 3.79

24 ..... 3.54 .... 4.46 .... 6.23 .... 8.96 .. 12.44 .. 14.90 .. 16.10 .. 15.29 .. 12.46 .... 8.79 .... 5.39 .... 3.72

25 ..... 3.42 .... 4.52 .... 6.24 .... 8.95 .. 12.36 .. 15.07 .. 16.14 .. 15.19 .. 12.34 .... 8.50 .... 5.29 .... 3.42

26 ..... 3.50 .... 4.49 .... 6.13 .... 9.00 .. 12.32 .. 15.18 .. 16.13 .. 15.17 .. 12.30 .... 8.21 .... 5.32 .... 3.40

27 ..... 3.63 .... 4.63 .... 6.27 .... 8.92 .. 12.48 .. 15.12 .. 15.97 .. 15.03 .. 12.25 .... 8.29 .... 5.03 .... 3.41

28 ..... 3.54 .... 4.52 .... 6.37 .... 9.00 .. 12.64 .. 15.27 .. 16.07 .. 15.00 .. 12.01 .... 8.29 .... 5.19 .... 3.41

29 ..... 3.72 .... 4.48* ... 6.47 .... 9.04 .. 12.69 .. 15.28 .. 16.19 .. 14.90 .. 12.03 .... 7.98 .... 5.06 .... 3.63

30 ..... 3.77 .... xxxxx .... 6.67 .... 9.41 .. 12.76 .. 15.24 .. 16.23 .. 14.89 .. 11.92 .... 8.13 .... 5.05 .... 3.58

31 ..... 3.93 .... xxxxx .... 6.77 .... xxxxx .. 12.92 .. xxxxxx .. 16.16 .. 14.65 .. xxxxxx .... 8.13 .... xxxxx .... 3.42

Month . 3.40 .... 4.05 .... 5.52 .... 8.05 .. 11.30 .. 14.35 .. 16.01 .. 15.67 .. 13.38 .... 9.85 .... 6.15 .... 4.16

<<>> ... JAN .... FEB .... MAR .... APR .... MAY .... JUN .... JUL .... AUG .... SEP .... OCT .... NOV .... DEC**

* leap year day, 58 cases (1800, 1900 not leap years) ... Feb monthly .01 lower than mean of the 29 days to allow for weighting the less frequent higher values of leap year day.

** Dec daily means adjusted 0.01 down to account for missing Dec 1786 which had monthly of 2.8.

To derive actual averages of 239 years of data, add .01 to each day in Dec.

___________________________________________________________

I will add other files gradually, the next one will show a recent 30-year average for these data with a comparison to the long-term.

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DATE ... MONTH

<<>> ... JAN .... FEB .... MAR .... APR .... MAY .... JUN .... JUL .... AUG .... SEP .... OCT .... NOV .... DEC

01 ..... 4.45 .... 4.44 .... 4.97 .... 8.26 .. 10.74 .. 13.38 .. 15.97 .. 16.82 .. 15.38 .. 12.77 .... 9.40 .... 5.49

02 ..... 4.58 .... 4.52 .... 4.79 .... 8.01 .. 10.35 .. 13.69 .. 15.99 .. 16.80 .. 15.44 .. 12.35 .... 9.06 .... 5.61

03 ..... 4.34 .... 4.70 .... 5.05 .... 7.30 .. 10.38 .. 13.27 .. 15.89 .. 16.93 .. 15.38 .. 12.17 .... 9.11 .... 5.96

04 ..... 4.38 .... 5.09 .... 4.75 .... 7.05 .. 10.36 .. 13.15 .. 16.09 .. 16.88 .. 14.82 .. 11.94 .... 8.64 .... 6.11

05 ..... 4.64 .... 5.29 .... 5.42 .... 7.19 .. 10.51 .. 13.30 .. 16.45 .. 17.20 .. 15.29 .. 11.75 .... 8.22 .... 6.26

06 ..... 4.61 .... 5.49 .... 6.32 .... 7.43 .. 10.93 .. 13.75 .. 16.41 .. 17.13 .. 15.12 .. 11.95 .... 8.08 .... 5.07

07 ..... 3.45 .... 4.89 .... 6.55 .... 7.30 .. 10.90 .. 14.08 .. 16.25 .. 16.74 .. 15.08 .. 11.83 .... 8.32 .... 4.85

08 ..... 3.99 .... 4.45 .... 6.47 .... 7.06 .. 10.77 .. 13.99 .. 16.42 .. 16.67 .. 15.07 .. 11.95 .... 8.76 .... 4.36

09 ..... 4.31 .... 4.02 .... 6.27 .... 7.30 .. 10.70 .. 14.09 .. 16.19 .. 16.87 .. 14.79 .. 11.97 .... 8.18 .... 4.34

10 ..... 4.45 .... 4.13 .... 6.83 .... 8.12 .. 10.72 .. 14.32 .. 16.60 .. 16.80 .. 14.63 .. 12.22 .... 8.06 .... 4.27

11 ..... 4.36 .... 4.27 .... 6.51 .... 8.01 .. 10.97 .. 13.71 .. 16.67 .. 16.73 .. 14.82 .. 11.58 .... 8.25 .... 4.19

12 ..... 4.26 .... 4.77 .... 5.90 .... 7.77 .. 11.22 .. 13.92 .. 16.49 .. 16.82 .. 14.39 .. 11.37 .... 8.18 .... 4.28

13 ..... 4.54 .... 4.00 .... 6.23 .... 7.56 .. 11.59 .. 14.02 .. 16.55 .. 16.37 .. 13.89 .. 11.22 .... 7.23 .... 4.62

14 ..... 4.49 .... 3.36 .... 6.53 .... 7.99 .. 11.63 .. 14.27 .. 16.76 .. 16.85 .. 13.74 .. 10.80 .... 6.89 .... 4.48

15 ..... 4.66 .... 3.57 .... 6.99 .... 8.25 .. 11.68 .. 14.21 .. 16.99 .. 16.91 .. 13.63 .. 10.74 .... 6.81 .... 4.57

16 ..... 4.75 .... 3.63 .... 6.89 .... 8.60 .. 11.38 .. 14.85 .. 16.72 .. 16.63 .. 13.86 .. 10.25 .... 6.79 .... 4.53

17 ..... 4.45 .... 3.66 .... 7.43 .... 8.41 .. 11.36 .. 15.04 .. 16.27 .. 16.58 .. 13.90 .... 9.87 .... 6.23 .... 4.44

18 ..... 4.35 .... 3.81 .... 7.09 .... 8.11 .. 11.53 .. 14.87 .. 16.45 .. 16.46 .. 13.80 .. 10.00 .... 6.65 .... 4.34

19 ..... 4.89 .... 4.07 .... 6.68 .... 8.11 .. 11.93 .. 15.26 .. 16.88 .. 16.88 .. 13.64 .. 10.00 .... 6.32 .... 4.30

20 ..... 5.04 .... 3.95 .... 6.54 .... 8.39 .. 12.32 .. 14.98 .. 17.08 .. 16.77 .. 14.02 .... 9.74 .... 5.99 .... 3.75

21 ..... 4.98 .... 4.23 .... 6.61 .... 9.08 .. 12.17 .. 14.50 .. 16.81 .. 16.36 .. 13.63 .... 9.77 .... 5.67 .... 4.30

22 ..... 4.35 .... 4.25 .... 6.91 .... 9.36 .. 12.19 .. 14.61 .. 16.78 .. 16.43 .. 13.69 .... 9.57 .... 5.74 .... 4.45

23 ..... 4.44 .... 4.33 .... 6.95 .... 9.64 .. 12.86 .. 14.90 .. 16.78 .. 16.11 .. 13.42 .... 9.61 .... 5.76 .... 4.69

24 ..... 4.58 .... 4.58 .... 7.41 .... 9.64 .. 13.35 .. 14.91 .. 16.47 .. 16.08 .. 12.76 .... 9.36 .... 6.00 .... 4.68

25 ..... 4.21 .... 4.21 .... 7.33 .. 10.15 .. 12.45 .. 15.31 .. 17.03 .. 15.78 .. 12.73 .... 9.39 .... 6.20 .... 4.50

26 ..... 4.16 .... 4.80 .... 7.22 .. 10.02 .. 12.50 .. 15.33 .. 17.20 .. 15.73 .. 12.79 .... 9.54 .... 6.06 .... 4.34

27 ..... 4.30 .... 5.21 .... 6.98 .. 10.03 .. 12.26 .. 15.60 .. 17.07 .. 15.42 .. 12.70 .... 9.73 .... 5.88 .... 4.08

28 ..... 4.40 .... 5.19 .... 7.19 .... 9.84 .. 12.49 .. 15.56 .. 17.28 .. 15.17 .. 13.18 .... 9.63 .... 5.57 .... 4.22

29 ..... 4.69 .... 4.43* ... 7.20 .... 9.85 .. 12.76 .. 15.95 .. 17.67 .. 15.22 .. 13.03 .... 8.73 .... 5.32 .... 4.04

30 ..... 4.28 .... xxxxx .... 7.57 .. 10.39 .. 13.09 .. 15.88 .. 17.47 .. 15.47 .. 12.73 .... 9.12 .... 5.58 .... 4.23

31 ..... 4.56 .... xxxxx .... 7.93 .... xxxxx .. 13.23 .. xxxxxx .. 17.15 .. 15.10 .. xxxxxx .... 9.18 .... xxxxx .... 4.29

 

Month . 4.45 .... 4.39 .... 6.56 .... 8.47 .. 11.66 .. 14.49 .. 16.67 .. 16.41 .. 14.04 .. 10.65 .... 7.10 .... 4.63 >> ... JAN .... FEB .... MAR .... APR .... MAY .... JUN .... JUL .... AUG .... SEP .... OCT .... NOV .... DEC

 

* leap year day, 7 cases ... Feb monthly is 4.39 whether you weight leap year day or not. ________________________________________________________________________________________ Departures from the first table (240 yrs) are from a data set that include these years. To calculate (approximately) what the increase or in a few cases decrease is from the previous years (this is approximate because 2011 is after the 30-year period) you can inflate the anomalies by one-eighth. Example, if a certain day has become 0.8 deg warmer in the recent 30-year period then it is 0.9 deg warmer than the years before the period started. I will try to post a chart of the anomalies on an annual scale below, but you can see from a visual inspection that certain periods in mid-February, early April and parts of June were actually colder in 1981-2010 than the entire series, while many other parts of the year have warmed about a degree or so. The largest single daily anomaly is +1.99 deg for 10 March followed by +1.97 for 8 November. In the graph provided in the link, the scale is 0.1 deg so read "20" as 2.0 C deg ... the graph shows the daily departures of the modern 1981-2010 "normal" period from the long-term mean of 1772-2011. As explained, you can get an approximation of the change from before 1981, by increasing the anomalies by one-eighth of their values. Example, 0.8 becomes 0.9 and -0.24 becomes -0.27. Zero stays at zero. What makes this approximate is that 2011 is part of the data set. The logic of this means that if the date you're looking at had a very warm day in 2011, then the positive departure of the 30-year period would be increased by slightly more than one-eighth to compare it to pre-1981. The biggest variation would only be about 2% (so 14%).

19812010.xls

Edited by Roger J Smith
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Dalton minimum 30-year averages

1795 to 1824

This table can be compared to the first two, showing how cold the winter climate can be for a 30-year period. I chose the coldest possible 30-year winter period, 1795-1824 ... the Dalton is usually held to be about 1794 to 1834 spanning three rather weak solar cycles that peaked around 1801, 1816 and 1830. This chosen period may not be the coldest for other parts of the year. However, it does give you an idea how cold a non-glacial period can become, with some days showing averages below 2.0 deg C.

DATE ... MONTH

<<>> ... JAN .... FEB .... MAR .... APR .... MAY .... JUN .... JUL .... AUG .... SEP .... OCT .... NOV .... DEC

01 ..... 2.10 .... 3.67 .... 4.31 .... 6.50 .... 9.76 .. 13.35 .. 14.87 .. 15.86 .. 14.42 .. 11.05 .... 7.98 .... 4.55

02 ..... 2.24 .... 3.66 .... 4.81 .... 6.58 .. 10.23 .. 13.57 .. 15.07 .. 15.72 .. 14.80 .. 11.33 .... 8.00 .... 3.98

03 ..... 1.83 .... 3.73 .... 5.02 .... 6.46 .. 10.21 .. 13.66 .. 14.75 .. 16.34 .. 15.14 .. 11.57 .... 6.92 .... 4.09

04 ..... 2.09 .... 3.28 .... 4.68 .... 6.51 .. 10.11 .. 13.70 .. 14.98 .. 15.65 .. 14.78 .. 11.63 .... 5.85 .... 4.73

05 ..... 2.45 .... 3.54 .... 4.14 .... 6.61 .. 10.60 .. 13.52 .. 15.00 .. 15.61 .. 14.28 .. 11.21 .... 6.06 .... 4.19

06 ..... 2.92 .... 3.68 .... 3.76 .... 6.90 .. 10.97 .. 13.22 .. 14.90 .. 15.58 .. 14.30 .. 11.19 .... 6.18 .... 3.66

07 ..... 2.38 .... 3.66 .... 3.89 .... 7.30 .. 11.35 .. 13.62 .. 15.19 .. 15.34 .. 13.90 .. 11.04 .... 6.48 .... 3.25

08 ..... 2.47 .... 3.44 .... 4.07 .... 7.43 .. 11.40 .. 13.80 .. 15.22 .. 15.75 .. 13.68 .. 10.83 .... 6.33 .... 3.01

09 ..... 2.61 .... 4.36 .... 3.84 .... 7.16 .. 10.91 .. 13.80 .. 15.47 .. 15.63 .. 13.73 .. 10.42 .... 6.07 .... 2.96

10 ..... 2.48 .... 4.53 .... 4.01 .... 7.35 .. 10.66 .. 13.69 .. 15.63 .. 15.84 .. 13.55 .. 10.07 .... 6.22 .... 2.74

11 ..... 2.39 .... 4.23 .... 4.22 .... 7.05 .. 10.64 .. 13.63 .. 15.94 .. 16.29 .. 13.66 .. 10.14 .... 6.55 .... 3.22

12 ..... 1.87 .... 3.91 .... 4.72 .... 6.98 .. 10.49 .. 13.39 .. 15.95 .. 16.13 .. 13.12 .... 9.56 .... 6.96 .... 3.30

13 ..... 2.25 .... 3.42 .... 4.47 .... 7.38 .. 10.17 .. 13.99 .. 15.98 .. 15.93 .. 13.13 .... 9.50 .... 6.08 .... 3.01

14 ..... 2.65 .... 3.02 .... 5.06 .... 7.74 .. 10.15 .. 14.43 .. 15.85 .. 15.74 .. 13.99 .... 9.48 .... 5.91 .... 3.05

15 ..... 1.73 .... 3.34 .... 5.18 .... 8.40 .. 10.65 .. 13.87 .. 15.64 .. 15.79 .. 14.23 .... 9.44 .... 5.76 .... 3.05

16 ..... 1.98 .... 3.53 .... 5.04 .... 8.29 .. 11.07 .. 13.91 .. 15.68 .. 15.53 .. 13.67 .... 8.92 .... 5.74 .... 3.51

17 ..... 2.40 .... 3.49 .... 4.99 .... 8.01 .. 11.59 .. 14.00 .. 15.82 .. 15.83 .. 13.83 .... 8.79 .... 5.57 .... 3.61

18 ..... 2.50 .... 3.53 .... 4.90 .... 7.70 .. 11.82 .. 14.26 .. 15.94 .. 15.90 .. 13.67 .... 9.47 .... 5.29 .... 3.65

19 ..... 2.95 .... 3.61 .... 4.83 .... 8.21 .. 11.69 .. 14.16 .. 16.10 .. 15.66 .. 13.16 .... 9.52 .... 4.67 .... 3.80

20 ..... 3.02 .... 3.52 .... 4.99 .... 8.49 .. 11.67 .. 14.21 .. 16.37 .. 15.32 .. 13.14 .... 9.66 .... 4.69 .... 3.19

21 ..... 2.96 .... 4.45 .... 5.47 .... 8.61 .. 11.46 .. 13.99 .. 15.54 .. 15.36 .. 12.83 .... 9.30 .... 4.80 .... 3.15

22 ..... 2.53 .... 5.01 .... 5.71 .... 8.40 .. 11.63 .. 14.24 .. 15.59 .. 15.26 .. 12.92 .... 9.19 .... 4.62 .... 2.90

23 ..... 2.29 .... 5.17 .... 5.46 .... 8.47 .. 11.75 .. 14.61 .. 15.93 .. 15.44 .. 12.53 .... 8.51 .... 4.56 .... 2.68

24 ..... 2.60 .... 4.80 .... 5.96 .... 8.75 .. 11.69 .. 15.23 .. 16.24 .. 15.38 .. 12.21 .... 8.58 .... 4.69 .... 2.24

25 ..... 2.38 .... 4.83 .... 5.67 .... 8.80 .. 12.22 .. 15.10 .. 15.91 .. 15.53 .. 11.85 .... 8.27 .... 4.85 .... 2.43

26 ..... 2.94 .... 3.99 .... 6.07 .... 9.06 .. 12.60 .. 14.66 .. 16.02 .. 14.98 .. 11.86 .... 8.29 .... 5.50 .... 2.98

27 ..... 3.74 .... 4.04 .... 6.03 .... 8.81 .. 12.64 .. 15.12 .. 15.88 .. 14.92 .. 11.70 .... 7.94 .... 4.46 .... 1.97

28 ..... 3.26 .... 3.65 .... 6.51 .... 9.28 .. 12.84 .. 14.84 .. 15.92 .. 14.80 .. 11.06 .... 7.73 .... 4.80 .... 3.41

29 ..... 3.03 .... 2.19* ... 6.68 .... 9.02 .. 12.50 .. 15.33 .. 16.35 .. 15.21 .. 11.27 .... 7.25 .... 5.45 .... 3.01

30 ..... 2.94 .... xxxxx .... 6.73 .... 9.39 .. 11.96 .. 15.02 .. 16.55 .. 15.30 .. 11.50 .... 7.67 .... 5.06 .... 3.01

31 ..... 3.38 .... xxxxx .... 6.48 .... xxxxx .. 12.54 .. xxxxxx .. 16.55 .. 14.62 .. xxxxxx .... 8.08 .... xxxxx .... 2.45

Month . 2.56 .... 3.88 .... 5.09 .... 7.85 .. 11.29 .. 14.09 .. 15.70 .. 15.56 .. 13.26 .... 9.54 .... 5.69 .... 3.28

<<>> ... JAN .... FEB .... MAR .... APR .... MAY .... JUN .... JUL .... AUG .... SEP .... OCT .... NOV .... DEC

* Leap year day had only 7 cases, as 1800 was not a leap year (so 1796, 1804,08,12,16,20,24)

____________________________________________

Not all days in the Dalton period were colder than the long-term. For example, the period 21-25 Feb ran as much as two-thirds of a degree warmer. The first ten days of May also ran warmer by about half a degree at times. The end of July ran almost a half degree warmer (although the first third of July was a degree colder at times). 15 to 23 September saw another warmer spell in the half degree range.

The colder winters were most evident in Dec-Jan rather than Feb, and the onset of these colder winters was marked by considerably colder weather around 3-6 November (over a degree below the long-term averages there). Another marked cooling took place 17-25 November which ran almost a degree lower than long-term. All of December ran consistently colder by an average of just about a full degree, the 8th-10th and 24th-27th were particularly cold. This much colder trend lasted through the January averages and faded out in February.

Edited by Roger J Smith
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Record highest and lowest for each date, January / February

01 Jan ... 10.8 (1851) ... -5.9 (1820) ... range 16.7
02 Jan ... 10.4 (1948) ... -6.1 (1786) ... range 16.5
03 Jan ... 11.6 (1932) ... -7.7 (1795) ... range 19.3
04 Jan ... 10.5 (1948) ... -9.3 (1867) ... range 19.8
05 Jan ... 11.4 (1957) ... -6.5 (1789) ... range 17.9

06 Jan ... 10.3 (1898) ... -6.9 (1894) ... range 17.2
07 Jan ... 10.3 (1890) ... -7.7 (1841) ... range 18.0
08 Jan ..... 9.9 (1848) ... -9.2 (1841) ... range 19.1
09 Jan ... 10.7 (1998) ... -5.0 (1841) ... range 15.7
10 Jan ... 11.1 (1921) ... -6.7 (1814) ... range 17.8

11 Jan ... 10.1 (1990) ... -5.5 (1838) ... range 15.6
12 Jan ..... 9.9 (1976 ..... -7.7 (1987) ... range 17.6
.. .. .. .. .. .. .. .. &2007)
13 Jan ... 10.0 (1796 ..... -6.6 (1987) ... range 16.6
.. .. .. .. .. .. .. .. &1873)
14 Jan ... 10.2 (2011) ... -7.6 (1982) ... range 17.8
15 Jan ... 10.3 (1804) ... -8.5 (1820) ... range 18.8

16 Jan ... 10.8 (1990) ... -7.7 (1881) ... range 18.5
17 Jan ... 10.2 (1908) ... -6.2 (1881) ... range 16.4
18 Jan ... 10.0 (1828) ... -6.1 (1891) ... range 16.1
19 Jan ... 11.1 (1930) ... -8.9 (1823) ... range 20.0
20 Jan ... 11.2 (2008) .. -11.9 (1838) ... range 23.1

21 Jan ... 10.8 (1796 ..... -8.1 (1881) ... range 18.9
.. .. .. .. .. .. .. .. &1898)
22 Jan ... 10.3 (1878) ... -6.4 (1881) ... range 16.7
23 Jan ... 11.6 (1834) ... -8.4 (1963) ... range 20.0
24 Jan ... 10.6 (1782) ... -8.2 (1963) ... range 18.8
25 Jan ... 11.6 (2016) ... -8.9 (1795) ... range 20.5 ... breaks previous 11.4 1846

26 Jan ... 10.0 (1834) ... -7.6 (1945) ... range 17.6
27 Jan ... 10.5 (2016) ... -6.5 (1776) ... range 17.0 ... breaks previous 10.4 2003
28 Jan ..... 9.8 (1944) ... -6.3 (1776) ... range 16.1
29 Jan ... 10.4 (1854) ... -6.8 (1776) ... range 17.2
30 Jan ... 10.2 (2000) ... -7.5 (1776) ... range 17.7

31 Jan ... 10.9 (1868) ... -7.2 (1776) ... range 18.1

01 Feb ... 11.4 (1923) ... -6.8 (1956) ... range 18.2
02 Feb ... 11.0 (1923) ... -6.5 (1956) ... range 17.5
03 Feb ... 12.2 (2004) ... -5.4 (1841 & 1956) ... r 17.6
04 Feb ... 12.8 (2004) ... -5.0 (1912) ... range 17.8
05 Feb ... 11.8 (2004) ... -6.3 (1830) ... range 18.1

06 Feb ... 10.3 (1866) ... -7.3 (1895) ... range 17.6
07 Feb ... 10.5 (1869) ... -7.2 (1895) ... range 17.7
08 Feb ... 11.4 (1903) ... -8.3 (1895) ... range 19.7
09 Feb ... 11.4 (1831) ... -8.8 (1816) ... range 20.2
10 Feb ... 12.0 (1899) ... -6.2 (1895) ... range 18.2

11 Feb ... 11.4 (1939) ... -4.2 (1986) ... range 15.6
12 Feb ... 11.4 (1998) ... -7.7 (1845) ... range 19.1
13 Feb ... 12.0 (1998) ... -7.0 (1929) ... range 19.0
14 Feb ... 10.2 (1794) ... -7.1 (1929) ... range 17.3
15 Feb ... 11.2 (1958) ... -8.0 (1929) ... range 19.2

16 Feb ... 10.0 (1928) ... -7.3 (1855) ... range 17.3
17 Feb ... 10.7 (1878) ... -7.1 (1855) ... range 17.8
18 Feb ... 11.7 (1945) ... -3.9 (1855) ... range 15.6
19 Feb ... 10.6 (1893) ... -5.0 (1777) ... range 15.6
20 Feb ... 11.3 (1990) ... -6.6 (1785) ... range 17.9

21 Feb ... 10.6 (1813) ... -4.7 (1810) ... range 15.2
22 Feb ... 10.7 (1953) ... -3.3 (1855) ... range 14.0
23 Feb ... 11.7 (2012) ... -3.5 (1947) ... range 15.2
24 Feb ... 11.4 (1846) ... -6.7 (1947) ... range 18.1
25 Feb ... 11.0 (1922) ... -5.1 (1947) ... range 16.1

26 Feb ... 11.2 (1882) ... -4.7 (1783) ... range 15.9
27 Feb ... 11.5 (1828) ... -2.8 (1929) ... range 14.3
28 Feb ... 11.4 (1959) ... -3.8 (1785) ... range 15.3
29 Feb ... 12.0 (1960) ... -2.4 (1904) ... range 14.4

Edited by Roger J Smith
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Record highest and lowest for each date, March / April

01 Mar ... 10.7 (1878) ... -3.5 (1785) ... range 14.2
02 Mar ... 11.1 (1777) ... -3.2 (1965) ... range 14.3
03 Mar ... 11.0 (1777) ... -3.9 (1965) ... range 14.9
04 Mar ... 12.3 (1859) ... -2.9 (1909) ... range 15.2
05 Mar ... 10.9 (1834) ... -2.8 (1786&1909) . r 13.7

06 Mar ... 12.0 (1989) ... -4.7 (1786) ... range 16.7
07 Mar ... 10.9 (1875) ... -3.3 (1947) ... range 14.2
08 Mar ... 12.2 (2000) ... -3.1 (1786) ... range 15.3
09 Mar ... 12.4 (1948) ... -3.0 (1917) ... range 15.4
10 Mar ... 11.6 (1957) ... -2.4 (1883) ... range 14.0

11 Mar ... 12.6 (1957) ... -1.9 (1847) ... range 14.5
12 Mar ... 13.4 (1957) ... -2.4 (1785) ... range 15.8
13 Mar ... 12.8 (1991) ... -6.5 (1845) ... range 19.3
14 Mar ... 11.5 (1805) ... -3.7 (1845) ... range 15.2
15 Mar ... 11.9 (1884) ... -1.6 (1867) ... range 13.5

16 Mar ... 13.2 (2004) ... -3.0 (1845) ... range 16.2
17 Mar ... 13.2 (2005) ... -2.2 (1845) ... range 15.4
18 Mar ... 14.1 (1990) ... -1.3 (1853) ... range 15.4
19 Mar ... 11.8 (1822) ... -0.9 (1914) ... range 12.7
20 Mar ... 12.3 (1779) ... -1.6 (1845) ... range 13.9

21 Mar ... 11.7 (1927 ..... -1.6 (1899) ... range 13.3
.. .. .. .. .. .. .. .. &1931)
22 Mar ... 12.6 (1903) ... -0.9 (1837) ... range 13.5
23 Mar ... 12.1 (1852 ..... -0.8 (1837&1899) . r 12.9
.. .. .. .. .. .. .. .. &1945)
24 Mar ... 13.4 (1776) ... -0.6 (1879) ... range 14.0
25 Mar ... 13.9 (1777) ... -1.3 (1853) ... range 15.2

26 Mar ... 14.6 (1777) ... -0.3 (1879&1901) . r 14.9
27 Mar ... 14.8 (1777)..... 0.1 (1901) ... range 14.7 _ 14.8 highest in March to 2017
28 Mar ... 12.6 (1822 ..... -0.3 (1785) ... range 12.9
.. .. .. .. .. .. .. .. &1998)
29 Mar ... 13.4 (1813) ... -0.7 (1785) ... range 14.1
30 Mar ... 15.1 (2017)..... 0.0 (1799) ... range 15.1 _ former record 13.4 (1920)

31 Mar ... 13.8 (1815) ... -0.8 (1799) ... range 14.6


01 Apr ... 13.3 (1995) ... -0.2 (1917) ... range 13.5
02 Apr ... 13.9 (1835) ... -0.5 (1917) ... range 14.4
03 Apr ... 15.0 (1926 ..... -0.5 (1799) ... range 15.5
.. .. .. .. .. .. .. .. &1946)
04 Apr ... 15.6 (1946)..... 1.0 (1809&1830) . r 14.6
05 Apr ... 13.3 (1857) ..... 0.4 (1911) ... range 12.9

06 Apr ... 15.1 (2011) ..... 0.8 (1911) ... range 14.3
07 Apr ... 14.7 (1859) ..... 1.0 (1839) ... range 13.7
08 Apr ... 12.5 (1798) ..... 2.4 (1780) ... range 10.1
09 Apr ... 13.7 (2017) ..... 1.4 (1812) ... range 12.1 _ former record 13.5 (1778)
10 Apr ... 13.5 (1928) ..... 0.5 (1837) ... range 13.0

11 Apr ... 16.0 (1869) ..... 1.3 (1978) ... range 14.7
12 Apr ... 14.4 (1939) ..... 1.1 (1879) ... range 13.3
13 Apr ... 14.6 (1792) ..... 1.1 (1816) ... range 13.5
14 Apr ... 16.1 (1869) ..... 0.5 (1966) ... range 15.6
15 Apr ... 16.3 (1945) ..... 1.4 (1966) ... range 14.9

16 Apr ... 17.0 (1945) ..... 2.0 (1892) ... range 15.0
17 Apr ... 14.9 (1865) ..... 2.1 (1793&1812) . r 12.8
18 Apr ... 14.5 (1945) ..... 1.7 (1807) ... range 12.8
19 Apr ... 15.4 (1870) ... -0.2 (1772) ... range 15.6
20 Apr ... 16.6 (1893) ..... 2.3 (1849) ... range 14.3

21 Apr ... 16.1 (1893) ..... 2.4 (1936) ... range 13.7
22 Apr ... 15.4 (2011) ..... 3.4 (1778) ... range 12.0
23 Apr ... 15.9 (1874) ..... 2.6 (1908) ... range 13.3
24 Apr ... 15.3 (2007) ..... 0.5 (1908) ... range 14.8
25 Apr ... 15.9 (1821) ..... 1.8 (1908) ... range 14.1

26 Apr ... 16.1 (1928) ..... 3.3 (1981) ... range 11.4
27 Apr ... 16.5 (1866) ..... 2.7 (1919) ... range 14.3
28 Apr ... 16.9 (1775) ..... 3.0 (1826) ... range 15.3
29 Apr ... 19.7 (1775) ..... 0.7 (1856) ... range 19.0
30 Apr ... 17.4 (1775) ..... 2.6 (1945) ... range 14.8

_______________________________________________________

(valid to end of March 2017)

Edited by Roger J Smith
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Record highest and lowest for each date, May / June

01 May ... 16.1 (1990 ..... 4.2 (1866) ... range 11.9
.. .. .. .. .. .. .. .. &2005)
02 May ... 16.4 (1966) .... 3.8 (1979) ... range 12.6
03 May ... 17.7 (1990) .... 3.1 (1877) ... range 14.6
04 May ... 18.0 (1834) .... 3.2 (1877) ... range 14.8
05 May ... 16.7 (1800) .... 4.0 (1979) ... range 12.7

06 May ... 18.8 (1867) .... 4.4 (1831) ... range 14.4
07 May ... 16.8 (2008) .... 4.1 (1879) ... range 12.7
08 May ... 17.8 (2016) .... 2.9 (1861) ... range 14.9 ... (16.9 1867 previous)
09 May ... 17.6 (1945&2016) .. 5.7 (1837) .. range 11.9
10 May ... 18.2 (1959) .... 4.1 (1879) ... range 14.1

11 May ... 18.6 (2008) .... 4.1 (1773) ... range 14.5
12 May ... 18.8 (1945) .... 4.4 (1816) ... range 14.4
13 May ... 17.4 (1959) .... 5.0 (1915) ... range 12.4
14 May ... 18.8 (1992) .... 3.9 (1839) ... range 14.9
15 May ... 20.0 (1833) .... 4.3 (1839) ... range 15.7

16 May ... 20.0 (1808) .... 5.2 (1996) ... range 14.8
17 May ... 19.7 (1833) .... 3.6 (1935) ... range 16.1
18 May ... 19.1 (1952) .... 4.1 (1872) ... range 15.0
19 May ... 20.4 (1868) .... 5.2 (1872) ... range 15.2
20 May ... 17.8 (1916) .... 5.5 (1907) ... range 12.3

21 May ... 18.8 (1916) .... 5.7 (1894) ... range 13.1
22 May ... 19.5 (1918) .... 5.0 (1867) ... range 14.5
23 May ... 19.5 (1922) .... 4.9 (1867) ... range 14.6
24 May ... 18.8 (1953) .... 5.7 (1867) ... range 13.1
25 May ... 21.0 (1953) .... 6.5 (1814) ... range 14.5

26 May ... 18.7 (1784) .... 4.6 (1821) ... range 14.1
27 May ... 19.0 (1788) .... 6.6 (1984) ... range 12.4
28 May ... 20.6 (1847) .... 6.2 (1869) ... range 14.4
29 May ... 21.2 (1780) .... 6.2 (1869) ... range 15.0
30 May ... 21.0 (1944) .... 4.9 (1807) ... range 16.1

31 May ... 20.5 (1947) .... 6.4 (1802) ... range 14.1


01 Jun ... 20.9 (1781) .... 7.7 (1802&1962) . r 13.2
02 Jun ... 22.3 (1947) .... 7.6 (1991) ... range 14.7
03 Jun ... 23.0 (1947) .... 7.9 (1773) ... range 15.1
04 Jun ... 20.3 (1982) .... 8.0 (1871&1991) . r 12.3
05 Jun ... 21.3 (1982) .... 8.2 (1991) ... range 13.1

06 Jun ... 22.5 (1950) .... 8.4 (1909) ... range 14.1
07 Jun ... 21.6 (1846) .... 8.6 (1814) ... range 13.0
08 Jun ... 20.4 (1940) .... 8.6 (1881&1914) . r 11.8
09 Jun ... 20.9 (1970) .... 7.3 (1816) ... range 13.6
10 Jun ... 21.5 (1970) .... 8.2 (1821) ... range 13.3

11 Jun ... 21.0 (1970) .... 8.0 (1777) ... range 13.0
12 Jun ... 20.8 (2006) .... 8.6 (1841) ... range 12.2
13 Jun ... 20.5 (1818 ..... 8.5 (1901) ... range 12.0
.. .. .. .. .. .. .. .. &1989)
14 Jun ... 19.4 (1814) .... 7.9 (1903) ... range 11.5
15 Jun ... 22.9 (1858) .... 8.1 (1850) ... range 14.8

16 Jun ... 20.7 (1858 ..... 9.6 (1869) ... range 11.1
.. .. .. .. .. .. .. .. &1896)
17 Jun ... 21.4 (1917) .... 9.1 (1928) ... range 12.3
18 Jun ... 21.2 (2005) .... 8.1 (1855) ... range 13.1
19 Jun ... 22.1 (2005) .... 7.3 (1795) ... range 14.8
20 Jun ... 21.7 (1846) .... 9.0 (1795&1964) . r 12.7

21 Jun ... 22.7 (1817) .... 9.8 (1903) ... range 12.9
22 Jun ... 22.3 (1941) .... 9.0 (1823) ... range 13.3
23 Jun ... 21.8 (1935) .... 9.4 (1823) ... range 12.4
24 Jun ... 22.0 (1935) .. 10.1 (1784) ... range 11.9
25 Jun ... 21.6 (1935) .... 8.7 (1835) ... range 12.9

26 Jun ... 22.3 (1976) .... 9.7 (1835) ... range 12.6
27 Jun ... 22.8 (1826) .. 10.2 (1862) ... range 12.6
28 Jun ... 22.6 (1976) .... 9.4 (1812) ... range 13.2
29 Jun ... 22.4(1976) .... 9.7 (1839) ... range 12.7
30 Jun ... 22.1 (1976) .... 9.1 (1839) ... range 13.0

______________________________

valid through 30 June 2012 ... 26 May 2012 came close to breaking daily record at 18.4 C

Edited by Roger J Smith
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Record highest and lowest for each date, July / August

01 Jul ... 24.6 (2015) .... 10.4 (1773) ... range 14.2
02 Jul ... 22.8 (1976) ... 11.3 (1821) ... range 11.5
03 Jul ... 24.6 (1976) ... 10.1 (1907) ... range 14.5
04 Jul ... 24.7 (1976) ... 10.0 (1965) ... range 14.7
05 Jul ... 24.0 (1852) ... 10.7 (1920) ... range 13.3

06 Jul ... 23.3 (1976) ... 11.3 (1877) ... range 12.0
07 Jul ... 22.6 (1923 .... 11.1 (1877) ... range 11.5
.. .. .. .. .. .. .. .. &1976)
08 Jul ... 21.4 (1870 ..... 10.6 (1823) ... range 10.8
.. .. .. .. .. .. .. .. &1976)
09 Jul ... 21.6 (1921) ... 11.0 (1856) ... range 10.6
10 Jul ... 22.1 (1921) ... 11.2 (1993) ... range 10.9

11 Jul ... 22.6 (1783) ..... 9.4 (1888) ... range 12.8
12 Jul ... 23.7 (1923) ... 11.0 (1840) ... range 12.7
13 Jul ... 24.5 (1808) ... 10.2 (1840) ... range 14.3
14 Jul ... 24.4 (1808) ... 11.7 (1961) ... range 12.7
15 Jul ... 23.7 (1825) ... 11.5 (1883) ... range 12.2

16 Jul ... 22.7 (2003) ... 11.5 (1823) ... range 11.2
17 Jul ... 22.3 (1834) ... 11.0 (1892) ... range 11.3
18 Jul ... 23.3 (1825) ... 10.1 (1863) ... range 13.2
19 Jul ... 24.5 (2006) ... 10.6 (1892) ... range 13.9
20 Jul ... 23.5 (2016) ..... 8.7 (1836) ... range 14.8  __ MAX was 22.9 (1878)

21 Jul ... 23.1 (1868) ... 11.3 (1902) ... range 11.8
22 Jul ... 23.2 (1868) ... 11.5 (1902) ... range 11.7
23 Jul ... 22.4 (1989) ... 10.1 (1843) ... range 12.3
24 Jul ... 23.9 (1818) ... 11.1 (1843) ... range 12.8
25 Jul ... 22.7 (2006) ... 10.9 (1920) ... range 11.8

26 Jul ... 23.2 (2006) ... 11.0 (1884) ... range 12.2
27 Jul ... 21.9 (1948) ... 10.6 (1867) ... range 11.3
28 Jul ... 23.7 (1948) ... 11.8 (1886&1891) . r 11.9
29 Jul ... 25.2 (1948) ... 11.0 (1816) ... range 14.2
30 Jul ... 23.1 (1948) ... 10.6 (1786) ... range 12.5

31 Jul ... 23.4 (1943 ..... 10.9 (1841) ... range 12.5
.. .. .. .. .. .. .. .. &1995)



01 Aug ... 24.9 (1995) ... 11.9 (1888) ... range 13.0
02 Aug ... 24.6 (1995) ... 11.6 (1822) ... range 13.0
03 Aug ... 24.4 (1990) ... 10.5 (1912) ... range 13.9
04 Aug ... 23.4 (1975) ... 11.3 (1812) ... range 12.1
05 Aug ... 23.1 (2003) ... 11.3 (1812) ... range 11.8

06 Aug ... 22.5 (2003) ... 11.2 (1823&1860) . r 11.3
07 Aug ... 22.8 (1975) ... 11.6 (1898) ... range 11.2
08 Aug ... 23.7 (1975) ... 11.5 (1823) ... range 12.2
09 Aug ... 23.9 (2003) ... 11.0 (1931) ... range 12.9
10 Aug ... 22.5 (1773 ..... 10.8 (1892) ... range 11.7
.. .. .. .. .. .. .. .. &1997)

11 Aug ... 22.6 (1997) ... 10.8 (1902) ... range 11.8
12 Aug ... 22.2 (1911) ... 10.5 (1912) ... range 11.7
13 Aug ... 23.6 (1911) ... 10.5 (1881) ... range 13.1
14 Aug ... 21.3 (1911) ... 10.8 (1912) ... range 10.5
15 Aug ... 22.1 (1893) ... 10.3 (1829) ... range 11.8

16 Aug ... 21.6 (1947) ..... 9.5 (1888) ... range 12.1
17 Aug ... 22.4 (1876) ... 10.9 (1888) ... range 11.5
18 Aug ... 22.6 (1893) ... 10.3 (1830) ... range 12.3
19 Aug ... 22.8 (1932) ... 10.4 (1839) ... range 12.4
20 Aug ... 21.9 (1995) ... 10.5 (1920) ... range 11.4

21 Aug ... 21.6 (1984) ..... 9.8 (1850) ... range 11.8
22 Aug ... 22.1 (1955) ... 10.4 (1817) ... range 11.7
23 Aug ... 22.1 (1955) ... 10.3 (1877) ... range 11.8
24 Aug ... 21.5 (1990) ..... 9.1 (1864) ... range 12.4
25 Aug ... 20.9 (1899) .. 10.5 (1787,1843&64) .r 10.4

26 Aug ... 20.6 (1870) .... 8.8 (1864) ... range 11.8
27 Aug ... 22.8 (1930) ... 11.0 (1885&1890) . r 11.8
28 Aug ... 23.0 (1942) ... 10.5 (1919) ... range 12.5
29 Aug ... 20.6 (1930) ..... 9.1 (1812) ... range 11.5
30 Aug ... 19.8 (1808 ...... 9.5 (1890) ... range 10.3
.. .. .. .. .. .. .. .. &2008)

31 Aug ... 21.3 (1906) ..... 9.2 (1833) ... range 12.1

________________________________________________

 

Edited by Roger J Smith
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Record highest and lowest for each date, September / October

01 Sep ... 21.8 (1780 ..... 7.1 (1816) ... range 14.7
.. .. .. .. .. .. .. .. &1906)
02 Sep ... 22.6 (1906) .... 7.6 (1816) ... range 15.0
03 Sep ... 20.2 (1880) .... 8.2 (1816&1908) . r 12.0
04 Sep ... 20.7 (1880) .... 7.7 (1841) ... range 13.0
05 Sep ... 22.4 (1949) .... 8.1 (1841) ... range 14.3

06 Sep ... 20.8 (1898) .... 8.5 (1841) ... range 12.3
07 Sep ... 21.1 (1868) .... 8.6 (1952) ... range 12.5
08 Sep ... 21.3 (1898) .... 8.9 (1807&1931) . r 12.4
09 Sep ... 19.8 (1898) .... 9.2 (1860&1912) . r 10.6
10 Sep ... 19.2 (1865) .... 8.6 (1860) ... range 10.6

11 Sep ... 20.3 (1999) .... 8.1 (1860) ... range 12.2
12 Sep ... 20.4 (1945) .... 8.1 (1848) ... range 12.3
13 Sep ... 20.7 (2016) .... 6.7 (1807) ... range 14.0 _ was 19.4 (2006)
14 Sep ... 21.3 (2016) .... 6.7 (1807) ... range 14.6 _ was 19.3 (1934)
15 Sep ..18.8 (1947,2016) .. 7.9 (1986) ... range 10.9

16 Sep ... 19.6 (1961) .... 8.1 (1807) ... range 11.5
17 Sep ... 20.4 (1898) .... 8.1 (1807) ... range 12.3
18 Sep ... 19.7 (1926) .... 6.9 (1807) ... range 12.8
19 Sep ... 20.9 (1926) .... 7.4 (1952) ... range 13.5
20 Sep ... 18.4 (1947) .... 6.8 (1919) ... range 11.6

21 Sep ... 21.4 (2006) .... 6.5 (1872) ... range 14.9
22 Sep ... 18.7 (1956) .... 6.3 (1872) ... range 12.6
23 Sep ... 18.3 (1956) .... 6.0 (1773) ... range 12.3
24 Sep ... 18.3 (2006) .... 6.7 (1872) ... range 11.6
25 Sep ... 19.4 (1895) .... 7.4 (1812) ... range 12.0

26 Sep ... 18.4 (1895) .... 6.0 (1885) ... range 12.4
27 Sep ... 19.0 (1895) .... 6.1 (1824&1885) . r 12.9
28 Sep ... 18.9 (2011) .... 4.9 (1824) ... range 14.0
29 Sep ... 19.7 (2011) .... 5.5 (1918) ... range 14.2
30 Sep ... 20.0 (2011) .... 6.3 (1808) ... range 13.7


01 Oct ... 20.2 (1985) .... 6.1 (1808&1888) . r 14.1
02 Oct ... 17.9 (2011) .... 3.6 (1817) ... range 14.3
03 Oct ... 19.8 (2011) .... 4.7 (1817) ... range 15.1
04 Oct ... 17.7 (1959) .... 5.1 (1912) ... range 12.6
05 Oct ... 17.9 (1886) .... 4.6 (1888) ... range 13.3

06 Oct ... 19.0 (1921) .... 4.1 (1888) ... range 14.9
07 Oct ... 16.9 (1921) .... 3.5 (1829) ... range 13.4
08 Oct ... 17.7 (1995) .... 4.1 (1829) ... range 13.6
09 Oct ... 17.5 (1995) .... 3.3 (1852) ... range 14.2
10 Oct ... 17.8 (1921) .... 3.5 (1814) ... range 14.3

11 Oct ... 17.6 (1978) .... 3.9 (1860) ... range 13.7
12 Oct ... 16.5 (1978) .... 3.2 (1887) ... range 13.3
13 Oct ... 16.8 (1990) .... 2.2 (1838) ... range 14.6
14 Oct ... 16.1 (1990) .... 3.1 (1838) ... range 13.0
15 Oct ... 15.7 (1930) .... 2.5 (1843) ... range 13.2

16 Oct ... 15.8 (1818) .... 1.8 (1843) ... range 14.0
17 Oct ... 15.6 (1897) .... 2.5 (1824) ... range 13.1
18 Oct ... 16.0 (1954) .... 2.4 (1843) ... range 13.6 -- NOTE NEW RECORD 2014, 16.3 C (range now 13.9)
19 Oct ... 16.3 (1921) .... 1.5 (1813) ... range 14.8
20 Oct ... 14.9 (1795) .... 2.1 (1842) ... range 12.8

21 Oct ... 15.2 (1998) .... 1.2 (1842) ... range 14.0
22 Oct ... 16.2 (1906) .... 2.5 (1931) ... range 13.7
23 Oct ... 14.4 (1998) .... 0.9 (1859) ... range 13.5
24 Oct ... 14.3 (2009) .... 0.6 (1859) ... range 13.7
25 Oct ... 14.0 (1978) .... 2.0 (1784) ... range 12.0 -- NOTE RECORD MAX TIED 2013, 14.0 C

26 Oct ... 14.7 (1927) .... 1.5 (1785) ... range 13.2
27 Oct ... 16.7 (1888) .... 1.4 (1869) ... range 15.3 -- RANGE WAS THE EXTREME VALUE to 31st 2014
28 Oct ... 15.6 (1888) .... 0.9 (1895) ... range 14.7
29 Oct ... 14.0 (1772 ..... 0.3 (1895) ... range 13.7
.. .. .. .. .. .. .. .. &1984)
30 Oct ... 15.5 (2005) .... 0.7 (1836) ... range 14.8

31 Oct ... 14.5 (1772) .... 0.7 (1836) ... range 13.8 -- NOTE RECORD MAX BROKEN 2014, 16.9 C

............... 16.9 (2014) ... " " " " " " " " ... range 16.2

_______________________________________________

 

Edited by Roger J Smith
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Record highest and lowest for each date, November / December

01 Nov ... 13.5 (1894 ..... 1.5 (1836) ... range 12.0
.. .. .. .. .. .. .. .. &1982)
02 Nov ... 14.3 (1821) ... 0.5 (1880) ... range 13.8
03 Nov ... 15.0 (1996) .... 1.9 (1820) ... range 13.1
04 Nov ... 14.2 (1946) .... 0.8 (1845&1848) . r 13.4
05 Nov ... 15.4 (1938) .... 0.8 (1802) ... range 14.6

06 Nov ... 14.3 (2015) .... 0.6 (1868) ... range 13.7 ..... former record 13.4 (1772)
07 Nov ... 13.8 (2015) ... -0.6 (1791) ... range 14.4 ..... former record 13.4 (1772)
08 Nov ... 13.4 (1852) ... -1.2 (1812) ... range 14.6
09 Nov ... 12.5 (1988) ... -0.5 (1921) ... range 13.0
10 Nov ... 13.4 (1977) .... 0.1 (1812) ... range 13.3 ..... max 13.3 (2015) not record

11 Nov ... 13.9 (2015) .... 0.3 (1828) ... range 12.7 ..... former record 13.0 (2005)
12 Nov ... 13.8 (1938 ... -1.4 (1919) ... range 15.2
.. .. .. .. .. .. .. .. &1947)
13 Nov ... 14.6 (1938) .. -1.1 (1862) ... range 15.7
14 Nov ... 13.4 (1938) .. -1.1 (1925) ... range 14.6
15 Nov ... 13.5 (1821) .. -2.1 (1965) ... range 15.6

16 Nov ... 13.4 (1997) .. -2.9 (1901) ... range 16.3
17 Nov ... 13.1 (1997) .. -2.0 (1841) ... range 15.1
18 Nov ... 12.2 (1978) .. -1.6 (1887) ... range 13.8
19 Nov ... 12.7 (1994) .. -2.1 (1815) ... range 14.8
20 Nov ... 12.8 (2009) .. -1.2 (1829) ... range 14.0

21 Nov ... 13.7 (1947) .. -1.4 (1880) ... range 15.1
22 Nov ... 14.4 (1947) .. -2.3 (1773) ... range 16.7
23 Nov ... 13.3 (1947) .. -4.2 (1858) ... range 17.5
24 Nov ... 12.7 (1980) .. -4.6 (1904) ... range 17.3
25 Nov ... 12.1 (1964) .. -1.5 (1923) ... range 13.6

26 Nov ... 12.1 (1983) .. -1.7 (1904) ... range 13.8
27 Nov ... 11.3 (1818) .. -2.6 (1915) ... range 13.9
28 Nov ... 12.0 (1828) .. -4.0 (2010) ... range 16.0
29 Nov ... 12.2 (1818) .. -2.6 (1801) ... range 14.8
30 Nov ... 12.4 (2001) .. -1.7 (1973) ... range 14.1


01 Dec ... 12.1 (1775) .. -3.0 (1947) ... range 15.1
02 Dec ... 12.2 (1985) .. -4.7 (1796) ... range 16.9
03 Dec ... 12.2 (1985) .. -4.0 (1879) ... range 16.2
04 Dec ... 12.1 (1888) .. -3.8 (1879&1925) . r 15.9
05 Dec ... 12.6 (1898) .. -3.7 (1844) ... range 16.3

06 Dec ... 12.3 (1898) .. -5.5 (1844) ... range 17.8
07 Dec ... 12.3 (1856) .. -5.7 (1879) ... range 18.0
08 Dec ... 12.1 (1856) .. -5.4 (1807) ... range 17.5
09 Dec ... 11.8 (1934) .. -4.0 (1803) ... range 15.8
10 Dec ... 10.9 (1997) .. -4.5 (1784) ... range 15.4

11 Dec ... 12.6 (1994) .. -6.7 (1784) ... range 19.3
12 Dec ... 12.9 (1994) .. -8.5 (1981) ... range 21.4 ... 1994 all-time max broken 2015
13 Dec ... 11.6 (1918) .. -6.5 (1981) ... range 18.1
14 Dec ... 11.8 (1912) .. -5.3 (1878) ... range 17.1
15 Dec ... 11.2 (1985) .. -5.4 (1788) ... range 16.6

16 Dec ... 11.4 (2015) .. -6.6 (1859) ... range 18.0 ... former record 10.8 1842
17 Dec ... 12.5 (2015) .. -7.7 (1859) ... range 20.2 ... former record 11.6 1904
18 Dec ... 12.5 (2015) .. -7.1 (1859) ... range 19.6 ... former record 11.8 2014
19 Dec ... 13.1 (2015) .. -6.8 (2010) ... range 19.9 ... former record 11.6 1993
20 Dec ... 11.1 (1833) .. -7.0 (2010) ... range 18.1

21 Dec ... 11.4 (1971) .. -5.9 (2010) ... range 17.3
22 Dec ... 11.6 (1991) .. -6.8 (1890) ... range 18.4
23 Dec ... 11.8 (1991) .. -6.4 (1870) ... range 18.2
24 Dec ... 10.7 (1843) .. -6.9 (1870) ... range 17.6
25 Dec ... 10.4 (1824 .. -10.8 (1796) ... range 21.2
.. .. . .. .. .. .. .. &1983)

26 Dec ... 11.0 (2011) .. -5.4 (1798) ... range 16.4
27 Dec ... 10.9 (2015) .. -8.4 (1798) ... range 19.3 ... former record 10.6 1987
28 Dec ... 11.5 (1987) .. -8.2 (1798) ... range 19.7
29 Dec ... 12.0 (1987) .. -4.9 (1874) ... range 16.9
30 Dec ... 11.0 (1834) .. -6.1 (1870) ... range 17.1

31 Dec ... 11.1 (1859) .. -7.1 (1783) ... range 18.2

_______________________________________________

 

Edited by Roger J Smith
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Frequency of Record Highs and Lows

(from the daily records tabulated above in this thread)

YEAR .. Warm .. Cold

1772 ... 0.5 ... 1.0 ___ warm reduced by 1.0 (broken 2014) and by 2.0 (2015)
1773 ... 0.5 ... 5.0
1774 ... 0.0 ...
1775 ... 4.0 ...
1776 ... 1.0 ... 5.0
1777 ... 5.0 ... 2.0
1778 ... 0.0 ... 1.0 ___ warm reduced by 1.0 (broken 2017)
1779 ... 1.0 ...
1780 ... 1.5 ... 1.0

1781 ... 1.0 ...
1782 ... 1.0 ...
1783 ... 1.0 ... 2.0
1784 ... 1.0 ... 4.0
1785 ... 0.0 ... 7.0
1786 ... 0.0 ... 4.5
1787 ... 0.0 ... 0.3
1788 ... 1.0 ... 1.0
1789 ... 0.0 ... 1.0
1790 ... 0.0

1791 ... 0.0 ... 1.0
1792 ... 1.0
1793 ... 0.0 ... 0.5
1794 ... 1.0
1795 ... 1.0 ... 3.5
1796 ... 1.0*... 2.0
1797 ... 0.0 ...
1798 ... 1.0 ... 3.0
1799 ... 0.0 ... 3.0
1800 ... 1.0 ...

1801 ... 0.0 ... 1.0
1802 ... 0.0 ... 2.5
1803 ... 0.0 ... 1.0
1804 ... 1.0 ...
1805 ... 1.0 ...
1806 ... 0.0 ...
1807 ... 0.0 ... 8.5
1808 ... 3.5 ... 1.5
1809 ... 0.0 ... 0.5
1810 ... 0.0 ... 1.0

1811 ... 0.0 ...
1812 ... 0.0 ... 8.5
1813 ... 2.0 ... 1.0
1814 ... 1.0 ... 4.0
1815 ... 1.0 ... 1.0
1816 ... 0.0 ... 7.5
1817 ... 1.0 ... 3.0
1818 ... 4.5 ...
1819 ... 0.0 ...
1820 ... 0.0 ... 3.0

1821 ... 3.0 ... 3.0
1822 ... 1.5 ... 1.0
1823 ... 0.0 ... 5.5
1824 ... 0.5 ... 2.5
1825 ... 2.0 ...
1826 ... 1.0 ... 1.0
1827 ... 0.0 ...
1828 ... 3.0 ... 1.0
1829 ... 0.0 ... 4.0
1830 ... 0.0 ... 2.5

1831 ... 1.0 ... 1.0
1832 ... 0.0 ...
1833 ... 3.0 ... 1.0
1834 ... 6.0 ...
1835 ... 1.0 ... 2.0
1836 ... 0.0 ... 4.0
1837 ... 0.0 ... 3.5
1838 ... 0.0 ... 4.0
1839 ... 0.0 ... 6.0
1840 ... 0.0 ... 2.0
 

1841 ... 0.0 ... 9.5
1842 ... 0.0 ... 2.0 ___ lost one record high to Dec 2015
1843 ... 1.0 ... 5.3
1844 ... 0.0 ... 2.0
1845 ... 0.0 ... 6.5
1846 ... 3.0 ... 0.0 __ lost one record high to Jan 2016
1847 ... 1.0 ... 1.0
1848 ... 1.0 ... 1.5
1849 ... 0.0 ... 1.0
1850 ... 0.0 ... 2.0

1851 ... 1.0 ...
1852 ... 2.5 ... 1.0
1853 ... 0.0 ... 2.0
1854 ... 1.0 ...
1855 ... 0.0 ... 5.0
1856 ... 2.0 ... 2.0
1857 ... 1.0 ...
1858 ... 1.5 ... 1.0

1859 ... 3.0 ... 5.0
1860 ... 0.0 ... 4.0*

1861 ... 0.0 ... 1.0
1862 ... 0.0 ... 2.0
1863 ... 0.0 ... 1.0
1864 ... 0.0 ... 2.3
1865 ... 2.0 ...
1866 ... 2.0 ... 1.0
1867 ... 1.0 ... 6.0 ___ lost one max to 2016 
1868 ... 5.0 ... 1.0
1869 ... 3.0 ... 4.0
1870 ... 2.5 ... 3.0

1871 ... 0.0 ... 0.5
1872 ... 0.0 ... 5.0
1873 ... 0.5 ...
1874 ... 1.0 ... 1.0
1875 ... 1.0 ...
1876 ... 1.0 ...
1877 ... 0.0 ... 5.0
1878 ... 3.0 ... 1.0 ___ lost one record high to 2016
1879 ... 0.0 ... 7.0*
1880 ... 2.0 ... 2.0

1881 ... 0.0 ... 5.5
1882 ... 1.0 ...
1883 ... 0.0 ... 2.0
1884 ... 1.0 ... 1.0
1885 ... 0.0 ... 2.0*
1886 ... 1.0 ... 0.5
1887 ... 0.0 ... 2.0
1888 ... 3.0 ... 6.5
1889 ... 0.0 ...
1890 ... 1.0 ... 2.5

1891 ... 0.0 ... 1.5
1892 ... 0.0 ... 4.0
1893 ... 5.0 ...
1894 ... 0.5 ... 2.0
1895 ... 3.0 ... 6.0
1896 ... 0.5 ...
1897 ... 1.0 ...
1898 ... 7.5 ... 1.0
1899 ... 2.0 ... 1.5
1900 ... 0.0 ...

1901 ... 0.0 ... 2.5
1902 ... 0.0 ... 3.0
1903 ... 2.0 ... 2.0
1904 ... 0.0 ... 3.0 ... lost one record high to Dec 2015
1905 ... 0.0 ...
1906 ... 3.5 ...
1907 ... 0.0 ... 2.0
1908 ... 1.0 ... 3.5
1909 ... 0.0 ... 2.5
1910 ... 0.0 ...

1911 ... 3.0 ... 2.0
1912 ... 1.0 ... 5.5
1913 ... 0.0 ...
1914 ... 0.0 ... 1.5
1915 ... 0.0 ... 2.0
1916 ... 2.0 ...
1917 ... 1.0 ... 3.0
1918 ... 2.0 ... 1.0
1919 ... 0.0 ... 5.0
1920 ... 0.0 ... 3.0 ... lost one record high 30 March to 2017

1921 ... 7.0 ... 1.0
1922 ... 2.0 ...
1923 ... 3.5 ... 1.0
1924 ... 0.0 ...
1925 ... 0.0 ... 1.5
1926 ... 2.5 ...
1927 ... 1.5 ...
1928 ... 3.0 ... 1.0
1929 ... 0.0 ... 4.0
1930 ... 4.0 ...

1931 ... 0.5 ... 2.5
1932 ... 2.0 ... ... ... reduced from 3.0 as record on 18 Dec 1932 broken in 2014
1933 ... 0.0 ...
1934 ... 1.0 ... ... ... lost one record high to 2016
1935 ... 3.0 ... 1.0
1936 ... 0.0 ... 1.0
1937 ... 0.0 ...
1938 ... 3.5 ...
1939 ... 2.0 ...
1940 ... 1.0 ...

1941 ... 1.0 ...
1942 ... 1.0 ...
1943 ... 0.5 ...
1944 ... 2.0 ...
1945 ... 7.0 ... 2.0 ___ lost 0.5 max when 9 May tied by 2016
1946 ... 2.5 ...
1947 ..10.0 ... 5.0 ... ... ... lost 0.5 when 15 Sept 2016 tied 1947.
1948 ... 7.0 ...
1949 ... 1.0 ...
1950 ... 1.0 ...

1951 ... 0.0 ...
1952 ... 1.0 ... 2.0
1953 ... 3.0 ...
1954 ... 0.0 ... reduced from 1.0 as record broken 2014
1955 ... 2.0 ...
1956 ... 2.0 ... 2.5
1957 ... 4.0 ...
1958 ... 1.0 ...
1959 ... 3.0 ...
1960 ... 1.0 ...

1961 ... 1.0 ... 1.0
1962 ... 0.0 ... 0.5
1963 ... 0.0 ... 2.0
1964 ... 1.0 ... 0.5
1965 ... 0.0 ... 4.0
1966 ... 1.0 ... 2.0
1967 ... 0.0 ...
1968 ... 0.0 ...
1969 ... 0.0 ...
1970 ... 3.0 ...

1971 ... 1.0 ...
1972 ... 0.0 ...
1973 ... 0.0 ... 1.0
1974 ... 0.0 ...
1975 ... 2.5 ...
1976 .. 10.5 ...
1977 ... 1.0 ...
1978 ... 3.5 ... 1.0 ___ warm reduced 0.5 due to tie of one date in 2013

1979 ... 0.0 ... 2.0
1980 ... 1.0 ...

1981 ... 0.0 ... 3.0
1982 ... 2.5 ... 1.0
1983 ... 1.5 ...
1984 ... 1.5 ... 1.0
1985 ... 4.0 ...
1986 ... 0.0 ... 3.0
1987 ... 2.0 ... 2.0 ___ lost one record high to Dec 2015
1988 ... 1.0 ...
1989 ... 3.0 ...
1990 ... 9.5 ...

1991 ... 3.0 ... 2.5
1992 ... 1.0 ...
1993 ... 0.0 ... 1.0 ___ lost one record high to Dec 2015
1994 ... 3.0 ...
1995 ... 6.5 ...
1996 ... 1.0 ... 1.0
1997 ... 4.5 ...
1998 ... 5.5 ...
1999 ... 1.0 ...
2000 ... 2.0 ...

2001 ... 1.0 ...
2002 ... 0.0 ...
2003 ... 4.0 ... (reduced by 1.0 broken Jan 2016)
2004 ... 4.0 ...
2005 ... 4.5 ... (reduced by 1.0 broken Nov 2015)
2006 ... 6.0 ... ... ... lost one record high to 2016
2007 ... 1.5 ...
2008 ... 3.5 ...
2009 ... 2.0 ...
2010 ... 0.0 ... 4.0

2011 ... 9.0 ...
2012 ... 1.0 ...

2013 ... 0.5 ...

2014 ... 2.0 ... 0.0 ___ lost one record high to Dec 2015

2015 ... 8.0 ...

2016 ... 6.5

2017 ... 2.0 (to 30 April)
_____________________________________________________________

NOTES: Fractional totals are due to ties (one case with three, many with two years tied).

The frequency of record lows has dropped substantially in recent decades. This is easy to see, as all cases of zero record lows are left blank. Only the cold spell at the end of 2010 provides any daily record lows since 1996. The frequency of daily highs has increased at a much slower pace. Any year at random should score 1.5 for each. The average from 1772 to 1780 actually runs above that pace, then from about 1781 to 1817 there are fewer record highs. Starting in 1818 the pace begins to approach at least random, and only occasionally falls below that, for example in the 1880s. Note that 1947 and 1976 scored higher than any recent years. 2012, of course, has only had 0.6 year at time of writing to produce record highs or lows.

The frequency of record highs in the period 1982 to 2012 inclusive has seen about a quarter of all record highs (93.5) and that in about one-eighth of the total time, so we are generally seeing twice the frequency expected at random. However, this is not greatly different from 1931 to 1980 which was a longer period that produced about the same number of record highs.

The periods with the most record lows compared to random would seem to be the 1780s, 1807-1823 and 1835 to 1845. The frequency had already started to drop off considerably through the 20th century before the recent absolute decline that ended in 2010.

 

Updated through 2017 -- Apr

Edited by Roger J Smith
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Warmest and Coldest Day of each Year 1772-1830 (and coldest of each winter)

YEAR ... MAX DAILY MEAN (date)... MIN DAILY MEAN (date) ... Coldest of winter (Jan-Feb of year)

1772 ... 20.8 ... 26 June .................. -4.5 ... 06 Feb ...............-4.5 on 6 Feb .. no data Nov-Dec 1771

1773 ... 22.5 ... 10 Aug ................... -3.3 ... 09 Feb ...............-4.0 on 25 Dec 1772

1774 ... 20.2 ... 09 Aug ................... -3.2 ... 09 Dec .............. -3.0 on 4-5 Jan 1774

1775 ... 21.1 ... 21 July ................... -3.7 ... 25 Jan ............... -3.7 on 25 Jan 1775

1776 ... 20.3 ... 02 Aug ................... -7.5 ... 30 Jan ............... -7.5 on 30 Jan 1776

1777 ... 19.4 ... 16 & 17 July............ -5.0 ... 08 Jan,19 Feb ... -5.0 on 8 Jan & 19 Feb 1777

1778 ... 21.6 ... 13 July .................. -2.9 ... 27 Jan .............. -2.9 on 27 Jan 1778

1779 ... 22.0 ... 15 July ................... -5.1 ... 25 Dec ............... -1.4 on 15 Jan 1779

1780 ... 21.8 ... 01 Sep ................... -6.1 ... 13 Jan ............... -6.1 on 13 Jan 1780

1781 ... 20.9 ... 01 June .................. -2.9 ... 23 Jan ............... -2.9 on 23 Jan 1781

1782 ... 20.1 ... 26 June .................. -2.2 ... 16 Feb .............. -2.2 on 16 Feb 1782

1783 ... 22.6 ... 11 July .................... -7.1 ... 31 Dec .............. -4.7 on 26 Feb 1783

1784 ... 20.3 ... 07 July .................... -6.7 ... 12 Feb, 11 Dec.. -7.1 on 31 Dec 1783

1785 ... 19.5 ... 27 June, 26 July ..... -6.6 ... 20 Feb ............... -6.7 on 11 Dec 1784

1786 ... 20.7 ... 05 June ...................-7.6 ... 03 Jan ................ -7.6 on 3 Jan 1786

1787 ... 19.9 ... 05 July .................... -2.2 ... 28 Nov ............... -0.5 on 15 Nov 1786 & 27 Jan 1787**

1788 ... 20.4 ... 12 July .................... -5.9 ... 30 Dec .............. -2.5 on 8 March 1788

1789 ... 19.2 ... 05 Aug .................... -6.7 ... 12 Jan ............... -6.7 on 12 Jan 1789

1790 ... 21.8 ... 22 June .................. -0.6 ... 29 Dec ............... +0.6 on 20 Jan 1790

1791 ... 20.0 ... 05 June .................. -3.7 ... 12 Dec ................ -0.6 on 29 Dec 1790

1792 ... 21.8 ... 12 Aug ................... -5.4 ... 12 Jan ................. -5.4 on 12 Jan 1792

1793 ... 22.2 ... 16 July .................... -0.7 ... 30 Dec ............... -1.5 on 31 Dec 1792

1794 ... 20.6 ... 07 July .................... -2.8 ... 10 Jan ................ -2.8 on 10 Jan 1794

1795 ... 20.7 ... 12 Aug .................... -8.9 ... 25 Jan ................ -8.9 on 25 Jan 1795

1796 ... 19.6 ... 22 Aug .................. -10.8 ... 25 Dec .............. -1.4 on 6 & 7 March 1796

1797 ... 21.2 ... 14 July .................... -2.6 ... 09 Jan .............. -10.8 on 25 Dec 1796

1798 ... 21.4 ... 29 June .................. -8.4 ... 27 Dec ............... -1.6 on 19 Feb 1798

1799 ... 18.7 ... 10 June .................. -6.0 ... 31 Dec ................-8.4 on 27 Dec 1798

1800 ... 21.7 ... 02 Aug ................... -5.0 ... 01 Jan ................ -6.0 on 31 Dec 1799

1801 ... 20.2 ... 22 July ................... -3.8 ... 19 Dec ................ -1.3 on 13 Feb 1801

1802 ... 19.8 ... 06 Aug ................... -4.1 ... 13 Jan ................. -4.1 on 13 Jan 1802

1803 ... 20.8 ... 02 & 31 July ........... -5.9 ... 26 Jan ................. -5.9 on 26 Jan 1803

1804 ... 21.0 ... 01 Aug ................... -4.1 ... 24 Dec ................ -4.0 on 9 Dec 1803

1805 ... 18.9 ... 04 July ................... -3.8 ... 13 Dec ................ -4.1 on 24 Dec 1804

1806 ... 19.5 ... 10 June .................. -1.2 ... 30 Jan ................ -3.8 on 13 Dec 1805

1807 ... 21.2 ... 22 July .................... -5.4 ... 08 Dec ............... -2.5 on 18 & 19 Feb 1807

1808 ... 24.5 ... 13 July .................... -5.7 ... 22 Jan ................ -5.7 on 22 Jan 1808

1809 ... 18.5 ... 11 Aug*................... -5.1 ... 18 Jan ................ -5.1 on 18 Jan 1809

1810 ... 20.5 ... 02 Sep ................... -4.7 ... 21 Feb ................ -4.7 on 21 Feb 1810

1811 ... 18.6 ... 29 July ................... -3.6 ... 03 Jan ................. -3.6 on 3 Jan 1811

1812 ... 19.0 ... 18 July ................... -4.4 ... 08 Dec ................ -2.7 on 31 Dec 1811

1813 ... 20.2 ... 30 July ................... -3.2 ... 30 Dec ................ -4.4 on 8 Dec 1812

1814 ... 22.0 ....28 July ................... -6.7 ... 10 Jan ................. -6.7 on 10 Jan 1814

1815 ... 18.4 ... 12 July & 25 Aug..... -5.3 ... 24 Jan ................. -5.3 on 24 Jan 1815

1816 ....18.5 ... 20 July ................... -8.8 ... 09 Feb ................. -8.8 on 9 Feb 1816

1817 ... 22.7 ... 21 June ................. -2.0 ... 10 Jan .................. -4.9 on 22 Dec 1816

1818 ... 23.9 ... 24 July ................... -3.0 ... 17 Dec ................. -2.0 on 1 Jan 1818

1819 ... 21.8 ... 31 July ................... -6.0 ... 11 Dec ................. -3.0 on 17 Dec 1818

1820 ....21.9 ... 28 June .................. -8.5 ... 15 Jan ................. -8.5 on 15 Jan 1820

1821 ... 19.8 ... 05 Aug ................... -3.3 ... 02 Jan ................. -3.3 on 2 Jan 1821

1822 ....21.1 ... 10 Jun .................... -3.8 ... 28 Dec ................ +0.7 on 16 Jan 1822

1823 ... 19.2 ... 20 July & 14 Sep .... -8.9 ... 19 Jan ................. -8.9 on 19 Jan 1823

1824 ... 21.1 ... 02 Sep .................. -0.9 ... 14 Jan ................. -0.9 on 14 Jan 1824

1825 ... 23.7 ... 15 July .................. -1.2 ... 27 Dec ................. -0.7 on 4 Feb 1825

1826 ... 22.8 ... 27 June .................. -6.9 ... 15 Jan ................. -6.9 on 15 Jan 1826

1827 ... 20.7 ... 29 July ................... -4.7 ... 03 Jan ................. -4.7 on 03 Jan 1827

1828 ... 20.9 ... 03 July .................. -1.0 ... 09 Jan ................ -1.0 on 22 Nov 1827 & 9 Jan 1828

1829 ... 19.0 ... 03 June .................. -4.8.... 23 Jan ................ -4.8 on 23 Jan 1829

1830 ... 22.5 ... 30 July .................... -6.7 ... 24 Dec ................ -6.4 on 6 Feb 1830

_______________________________________________________

* worth noting that 18.4 on 19 May was just 0.1 below the annual max.

** the winter of 1786-87 has incomplete daily data; December dates are all listed as 2.8 which is the monthly mean but it's unlikely that this was the case, probably some day reached a value below the -0.5 C recorded in Nov 1786 and Jan 1787, a good estimate from the mean would be -3.5 C.

This table will be continued for the period 1831 to 1900 soon.

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Annual Daily Max and Min, Winter's coldest day ... 1831 to 1900

.... .... continued from previous post (1772-1830) .... ....

YEAR ..... MAX daily mean CET .... MIN daily mean CET .... Winter seasonal minimum (incl Jan-Feb of year)

1831 ... 20.2 ... 09 July .................... -3.0 ... 30 Jan ................. -6.7 on 24 Dec 1830

1832 ... 19.9 ... 10 Aug .................... -1.9 ... 01 Jan ................ -1.9 on 01 Jan 1832

1833 ... 20.0 ... 15 May & 28 July ..... -2.6 ... 23 Jan ............... -2.6 on 23 Jan 1833

1834 ... 22.3 ... 17 July .................... +0.4 ... 08 Feb ............... +0.4 on 8 Feb 1834

1835 ... 20.7 ... 10 & 11 Aug ............ -5.2 ... 07 Jan ................ -5.2 on 7 Jan 1835

1836 ... 22.1 ... 05 July .................... -3.5 ... 02 Jan ................ -3.5 on 2 Jan 1836

1837 ... 21.2 ... 27 July .................... -3.3 ... 01 Jan ................ -3.3 on 1 Jan 1837

1838 ... 20.3 ... 13 July .................. -11.9 ... 20 Jan ............. -11.9 on 20 Jan 1838

1839 ... 18.9 ... 03 Aug .................... -3.0 ... 30 Jan .................-3.0 on 30 Jan 1839

1840 ... 19.6 ... 06 Aug ................... -4.4 ... 25 Dec ................ -4.1 on 07 Jan 1840

1841 ... 18.8 ... 27 Aug .................... -9.2 ... 08 Jan ................ -9.2 on 8 Jan 1841

1842 ... 21.9 ... 10 Aug .................... -1.8 ... 09 Jan ................ -2.7 on 18 Dec 1841

1843 ... 20.4 ... 05 July .................... -3.5 ... 15 Feb ............... -3.5 on 15 Feb 1843

1844 ... 21.6 ... 23 June ................... -5.5 ... 06 Dec ............... -3.1 on 13 Feb 1844

1845 ... 19.6 ... 15 June ................... -7.7 ... 12 Feb ............... -7.7 on 12 Feb 1845

1846 ... 22.0 ... 22 June ................... -4.2 ... 14 & 15 Dec ....... -0.3 on 13 Dec 1845, 5 Jan 1846

1847 ... 22.5 ... 14 July .................... -5.0 ... 09 Feb ................ -5.0 on 9 Feb 1847

1848 ... 20.5 ... 06 July .................... -4.4 ... 28 Jan ................. -4.4 on 28 Jan 1848

1849 ... 19.0 ... 07 Aug .................... -3.8 ... 02 Jan & 28 Dec...-3.8 on 2 Jan 1849

1850 ... 21.3 ... 15 July .................... -2.8 ... 07 Jan ................. -3.8 on 28 Dec 1849

1851 ... 20.3 ... 27 June .................. -0.4 ... 30 Nov ................ -0.2 on 24 Jan 1851

1852 ... 24.0 ... 05 July .................... -0.5 ... 20 Feb ............... -0.5 on 20 Feb 1852

1853 ... 18.8 ... 07 July .................... -5.0 ... 28 Dec ............... -3.2 on 13 Feb 1853

1854 ... 21.2 ... 24 July .................... -4.6 ... 02 Jan ................ -5.0 on 28 Dec 1853

1855 ... 20.3 ... 23 July .................... -7.3 ... 16 Feb ............... -7.3 on 16 Feb 1855

1856 ... 22.2 ... 02 Aug .................... -3.0 ... 28 Dec ............... -4.7 on 21 Dec 1855

1857 ... 21.1 ... 28 June & 23 Aug ....-3.0 ... 29 Jan ................ -3.0 on 28 Dec 1856 & 29 Jan 1857

1858 ... 22.9 ... 15 June .................. -4.2 ... 23 Nov ................ -2.0 on 10 Mar 1858

1859 ... 22.2 ... 18 July .................... -7.7 ... 17 Dec ................-4.2 on 23 Nov 1858

1860 ... 17.2 ... 05 July .................... -3.9 ... 13 Feb ............... -7.7 on 17 Dec 1859

1861 ... 19.6 ... 12 Aug .................... -3.4 ... 29 Dec ............... -3.7 on 20 & 27 Dec 1860

1862 ... 17.3 ... 01 Aug .................... -2.6 ... 18 Jan ................ -3.4 on 29 Dec 1861

1863 ... 19.5 ... 07 Aug .................... +0.9 ... 11 Jan .............. -1.1 on 13 Nov 1862

1864 ... 19.7 ... 30 Aug .................... -6.2 ... 06 Jan ................ -6.2 on 6 Jan 1864

1865 ... 19.9 ... 04 & 24 July ............ -6.1 ... 28 Jan ................ -6.1 on 28 Jan 1865

1866 ... 20.6 ... 12 July .................... -3.2 ... 28 Feb ............... -3.2 on 28 Feb 1866

1867 ... 20.4 ... 13 Aug .................... -9.3 ... 04 Jan ................ -9.3 on 4 Jan 1867

1868 ... 23.2 ... 22 July .................... -1.4 ... 01 & 02 Jan ........ -1.4 on 1 & 2 Jan 1868

1869 ... 21.9 ... 17 July .................... -2.7 ... 28 Dec .................-0.7 on 24 Jan 1869

1870 ... 21.4 ... 08 July .................... -6.9 ... 24 Dec ................ -3.2 on 26 Jan & 11 Feb 1870

1871 ... 21.6 ... 13 Aug .................... -3.6 ... 01 Jan ................ -6.9 on 24 Dec 1870

1872 ... 22.0 ... 25 July ................... +0.7 ... 21 Mar & 11 Dec . -2.3 on 8 Dec 1871

1873 ... 22.3 ... 22 July .................... -2.9 ... 10 & 11 Dec ....... -1.5 on 1 Feb 1873

1874 ... 21.4 ... 09 July .................... -5.5 ... 22 Dec ................ -2.9 on 10 & 11 Dec 1873

1875 ... 19.2 ... 08 Aug .................... -1.7 ... 05 Dec ................ -5.5 on 22 Dec 1874

1876 ... 22.4 ... 17 Aug .................... -3.3 ... 11 Feb ............... -3.3 on 11 Feb 1876

1877 ... 19.6 ... 20 Aug .................... -1.0 ... 28 Feb ................ -1.0 on 28 Feb 1877

1878 ... 22.9 ... 20 July .................... -5.8 ... 25 Dec ................ +0.4 on 27 Dec 1877

1879 ... 18.4 ... 12 Aug .................... -5.7 ... 07 Dec .................-5.8 on 25 Dec 1878

1880 ... 20.7 ... 04 Sep .................... -4.3 ... 20 Jan ................. -5.7 on 07 Dec 1879

1881 ... 21.9 ... 05 July .................... -8.1 ... 21 Jan ................ -8.1 on 21 Jan 1881

1882 ... 18.6 ... 13 Aug .................... -3.7 ... 11 Dec ............... -1.0 on 10 Dec 1881

1883 ... 19.0 ... 30 June .................. -2.4 ... 10 Mar ............... -3.7 on 11 Dec 1882

1884 ... 22.5 ... 11 Aug .................... -1.1 ... 23 Dec ................ -0.1 on 7 Dec 1883

1885 ... 21.1 ... 26 July .................... -2.1 ... 08 Dec ................ -1.1 on 23 Dec 1884

1886 ... 20.7 ... 04 July .................... -3.3 ... 20 Dec ............... -2.7 on 7 Jan 1886

1887 ... 20.6 ... 06 Aug .................... -3.9 ... 01 Jan ................ -3.9 on 01 Jan 1887

1888 ... 19.6 ... 10 Aug .................... -1.8 ... 25 Feb ............... -2.3 on 27 Dec 1887

1889 ... 19.2 ... 12 Sep .................... -2.7 ... 10 Feb ................-2.7 on 10 Feb 1889

1890 ... 18.2 ... 05 Aug .................... -6.8 ... 22 Dec ................ -2.0 on 3 Mar 1890

1891 ... 18.8 ... 25 June ................... -6.1 ... 18 Jan ................ -6.8 on 22 Dec 1890

1892 ... 19.4 ... 03 July .................... -5.0 ... 28 Dec ............... -4.9 on 24 Dec 1891

1893 ... 22.6 ... 18 Aug .................... -5.0 ... 05 Jan ................ -5.0 on 28 Dec 1892 & 5 Jan 1893

1894 ... 20.1 ... 01 July .................... -6.9 ... 06 Jan ................ -6.9 on 6 Jan 1894

1895 ... 20.0 ... 26 June ................... -8.3 ... 08 Feb ............... -8.3 on 8 Feb 1895

1896 ... 20.7 ... 16 June ................... -0.9 ... 21 Jan & 30 Nov.. -0.9 on 21 Jan 1896

1897 ... 22.2 ... 05 Aug .................... -2.8 ... 23 Dec ................ -2.2 on 23 Jan 1897

1898 ... 21.3 ... 08 Sep ................... +0.2 ... 21 Feb ................ -2.8 on 23 Dec 1897

1899 ... 21.1 ... 20 July .................... -4.8 ... 14 Dec ............... -1.6 on 21 Mar 1899

1900 ... 22.0 ... 20 July .................... -3.4 ... 08 Feb ............... -4.8 on 14 Dec 1899

The next table will be 1901-60, then 1961-2012.

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Annual extremes for 1901-60 with coldest day of winter season

.... .... continued from above tables .... ....

YEAR ... MAX daily mean (date) .... MIN daily mean (date) .... WINTER MIN (date)

_________________________________________________________________________

1901 ... 22.6 ... 19 July .................... -3.5 ... 22 Dec ............... -2.6 on 14 Feb 1901

1902 ... 20.0 ... 28 June .................. -3.6 ... 13 Feb ............... -3.6 on 13 Feb 1902

1903 ... 20.2 ... 09 July .................... -3.3 ... 14 Jan ............... -3.3 on 14 Jan 1903

1904 ... 21.4 ... 04 Aug .................... -4.6 ... 24 Nov ............... -2.6 on 29 Dec 1903

1905 ... 19.5 ... 09,13,14 July .......... -1.8 ... 16 Jan ................ -4.6 on 24 Nov 1904

1906 ... 22.6 ... 02 Seo .................... -2.5 ... 26 Dec ............... -0.7 on 18 Nov 1905

1907 ... 18.0 ... 16 July .................... -3.4 ... 24 Jan ................ -3.4 on 24 Jan 1907

1908 ... 19.6 ... 30 Sep .................... -5.2 ... 30 Dec ............... -2.4 on 05 Jan 1908

1909 ... 20.3 ... 15 Aug .................... -2.9 ... 04 Mar ................-5.2 on 30 Dec 1908

1910 ... 18.7 ... 20 & 21 June .......... -3.6 ... 27 Jan ................ -3.6 on 27 Jan 1910

1911 ... 23.6 ... 13 Aug .................... -2.4 ... 02 Feb ............... -2.4 on 2 Feb 1911

1912 ... 22.0 ... 15 & 16 July ............ -5.0 ... 04 Feb ............... -5.0 on 4 Feb 1912

1913 ... 18.9 ... 27 Sep .................... -1.9 ... 31 Dec ............... -0.9 on 30 Nov 1912 & 13 Jan 1913

1914 ... 21.0 ... 30 June ................... -0.4 ... 23 Jan ............... -1.9 on 31 Dec 1913

1915 ... 19.5 ... 08 June ................... -2.6 ... 27 Nov ............... -0.1 on 23 Dec 1914

1916 ... 20.0 ... 12 Aug .................... -2.3 ... 16 Dec ............... -2.6 on 27 Nov 1915

1917 ... 21.4 ... 17 June ................... -7.2 ... 07 Feb ............... -7.2 on 7 Feb 1917

1918 ... 21.0 ... 22 Aug .................... -3.3 ... 08 Jan ................ -3.3 on 8 Jan 1918

1919 ... 19.9 ... 16 Aug .................... -3.6 ... 09 Feb ................-3.6 on 9 Feb 1919

1920 ... 18.5 ... 25 May..................... -5.1 ... 13 Dec ............... -1.4 on 12 Nov 1919

1921 ... 22.3 ... 18 July .................... -0.5 ... 09 Nov ................ -5.1 on 13 Dec 1920

1922 ... 19.5 ... 23 May .................... -2.8 ... 06 Feb ............... -2.8 on 6 Feb 1922

1923 ... 24.0 ... 13 July ...,,............... -2.2 ... 27 Nov ......,......... +1.2 on 20 Feb 1923

1924 ... 21.2 ... 12 July .................... -1.7 ... 09 Jan ................ -2.2 on 27 Nov 1923

1925 ... 22.3 ... 22 July .................... -3.8 ... 04 Dec ................ +0.9 on 13 Mar 1925

1926 ... 22.1 ... 14 July .................... -4.8 ... 16 Jan ................. -4.8 on 16 Jan 1926

1927 ... 19.3 ... 06 Aug .................... -4.4 ... 19 Dec ................ -1.9 on 11 & 12 Feb 1927

1928 ... 19.2 ... 24 July .................... -1.5 ... 15 Dec ................ -4.4 on 19 Dec 1927

1929 ... 20.8 ... 16 July .................... -8.0 ... 15 Feb .................-8.0 on 15 Feb 1929

1930 ... 22.8 ... 27 Aug .................... -1.7 ... 17 Nov ................ -1.0 on 20 Mar 1930

1931 ... 18.7 ... 04 Aug .................... -2.1 ... 07 Mar ................ -2.1 on 7 Mar 1931

1932 ... 22.8 ... 19 Aug .................... -2.0 ... 10 Feb ............... -2.0 on 10 Feb 1932

1933 ... 22.2 ... 04 Aug ................... -3.0 ... 24 Jan ................ -3.0 on 24 Jan 1933

1934 ... 20.9 ... 07 July .................... -0.2 ... 02 Feb ................ -0.4 on 6 & 10 Dec 1933

1935 ... 22.0 ... 24 June ................... -4.0 ... 23 Dec ................ -0.2 on 9 & 28 Jan 1935

1936 ... 21.6 ... 21 June ................... -1.6 ... 13 Feb ............... -4.0 on 23 Dec 1935

1937 ... 21.4 ... 03 July .................... -1.1 ... 29 Jan & 18 Dec . -1.1 on 29 Jan 1937

1938 ... 20.8 ... 01 Aug .................... -4.2 ... 20 Dec ................ -1.1 on 18 Dec 1937

1939 ... 20.6 ... 07 June ................... -2.3 ... 30 Dec .................-4.2 on 20 Dec 1938

1940 ... 20.4 ... 08 & 09 June .......... -7.1 ... 21 Jan ................. -7.1 on 21 Jan 1940

1941 ... 22.5 ... 12 July .................... -3.6 ... 16 Jan ................ -3.6 on 16 Jan 1941

1942 ... 23.0 ... 28 Aug .................... -5.0 ... 21 Jan ................ -5.0 on 21 Jan 1942

1943 ... 23.4 ... 31 July .................... -1.4 ... 14 Dec ................ -0.9 on 4 Jan 1943

1944 ... 21.1 ... 29 May .................... -1.9 ... 26 Dec ............... -1.4 on 14 Dec 1943

1945 ... 21.0 ... 15 July .................... -7.6 ... 26 Jan ................ -7.6 on 26 Jan 1945

1946 ... 19.8 ... 02 July .................... -3.7 ... 20 Jan ................ -3.7 on 20 Jan 1946

1947 ... 23.0 ... 03 June ................... -6.7 ... 24 Feb ............... -6.7 on 24 Feb 1947

1948 ... 25.2 ... 29 July .................... -2.7 ... 21 Feb ............... -3.0 on 1 Dec 1947

1949 ... 22.4 ... 05 Sep .................... -0.6 ... 04 Feb ................-1.8 on 26 Dec 1948

1950 ... 22.5 ... 06 June ................... -2.8 ... 26 Jan ................ -2.8 on 26 Jan 1950

1951 ... 19.5 ... 21 July .................... -1.6 ... 29 Jan ................ -2.6 on 15 Dec 1950

1952 ... 22.5 ... 01 July .................... -3.7 ... 27 Jan ................ -3.7 on 27 Jan 1952

1953 ... 22.0 ... 12 Aug .................... -0.9 ... 05 Jan ................ -1.4 on 25 Nov 1952

1954 ... 18.2 ... 01 Sep .................... -5.0 ... 02 Feb ................ -5.0 on 2 Feb 1954

1955 ... 22.1 ... 22 & 23 Aug ............ -3.3 ... 20 Feb ............... -3.3 on 20 Feb 1955

1956 ... 18.7 ... 08 July & 22 Sep ..... -6.8 ... 01 Feb ............... -6.8 on 1 Feb 1956

1957 ... 22.3 ... 06 July ..................... -0.9 ... 16 Dec ............... -0.5 on 23 Nov 1956

1958 ... 20.0 ... 10 Aug .................... -2.8 ... 22 Jan ................ -2.8 on 22 Jan 1958

1959 ... 21.4 ... 20 Aug .................... -3.2 ... 14 & 16 Jan .........-3.2 on 14 & 16 Jan 1959

1960 ... 20.4 ... 05 June ................... -2.0 ... 14 Jan ................ -2.0 on 14 Jan 1960

... The final table in this series, 1961-2012 will appear soon ...

____________________________________________________________________

____________________________________________________________________

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Table of annual extreme values continued, 1961 to 2016-17

YEAR .... MAX DAILY MEAN (date) .... MIN DAILY MEAN (date) .... Coldest Daily Mean of Winter
_____________________________________________________________________________

1961 ... 21.6 ... 29 Aug .................... -3.5 ... 28 Dec ................ -0.7 on 13 Dec 1960
1962 ... 18.0 ... 09 July .................... -4.9 ... 01 Jan ................ -4.9 on 01 Jan 1962
1963 ... 19.1 ... 30 July .................... -8.4 ... 23 Jan ................ -8.4 on 23 Jan 1963
1964 ... 19.4 ... 17 July .................... -2.3 ... 26 Dec ................ -2.3 on 23 Dec 1963
1965 ... 18.6 ... 12 Aug .................... -3.9 ... 03 Mar ................ -3.9 on 3 Mar 1965
1966 ... 19.5 ... 09 June ................... -4.9 ... 19 Jan ................ -4.9 on 19 Jan 1966
1967 ... 20.6 ... 17 July .................... -2.2 ... 08 Dec ................ -1.8 on 08 Jan 1967
1968 ... 21.8 ... 01 July .................... -2.5 ... 10 Jan ................ -2.5 on 10 Jan 1968
1969 ... 21.4 ... 16 July .................... -3.5 ... 08 Feb ................-3.5 on 8 Feb 1969
1970 ... 21.6 ... 07 July .................... -3.7 ... 07 Jan ................ -3.7 on 7 Jan 1970

1971 ... 19.9 ... 09 July .................... -3.4 ... 04 Jan ................ -3.4 on 4 Jan 1971
1972 ... 19.2 ... 18 July .................... -4.5 ... 31 Jan ................ -4.5 on 31 Jan 1972
1973 ... 20.9 ... 16 Aug .................... -1.7 ... 30 Nov ............... -1.5 on 15 Feb 1973
1974 ... 18.6 ... 15 Aug .................... -1.6 ... 01 Jan ................ -1.7 on 30 Nov 1973
1975 ... 23.7 ... 08 Aug ...................... 0.0 ... 14 Dec ............... +1.7 on 09 Feb 1975
1976 ... 24.7 ... 04 July .................... -2.0 ... 04 Dec ............... -1.2 on 30 Jan 1976
1977 ... 20.0 ... 05 July .................... -1.8 ... 12 Jan ................ -2.0 on 04 Dec 1976
1978 ... 19.6 ... 01 June ................... -3.5 ... 31 Dec ............... -3.3 on 11 Feb 1978
1979 ... 19.5 ... 12 Aug .................... -4.3 ... 28 Jan ................ -4.3 on 28 Jan 1979
1980 ... 20.7 ... 05 June ................... -1.9 ... 14 Jan ............... -1.9 on 14 Jan 1980

1981 ... 20.1 ... 05 Aug .................... -8.5 ... 12 Dec ................ -0.7 on 14 Feb 1981
1982 ... 21.3 ... 05 June ................... -7.6 ... 14 Jan ................ -8.5 on 12 Dec 1981
1983 ... 22.7 ... 13 July ..................... -1.5 ... 23 Nov ............... -1.0 on 10 Feb 1983
1984 ... 21.6 ... 21 Aug .................... -1.9 ... 15 Feb ............... -1.9 on 15 Feb 1984
1985 ... 20.2 ... 01 Oct ..................... -4.4 ... 17 Jan ................ -4.4 on 17 Jan 1985
1986 ... 21.9 ... 28 June ................... -4.6 ... 10 Feb ............... -4.6 on 10 Feb 1986
1987 ... 20.9 ... 20 Aug .................... -7.7 ... 12 Jan ................ -7.7 on 12 Jan 1987
1988 ... 19.3 ... 07 Aug .................... -0.1 ... 22 Nov ................ -0.7 on 10 Dec 1987
1989 ... 23.1 ... 22 July .................... -0.3 ... 26 Nov .................-0.1 on 22 Nov 1988
1990 ... 24.4 ... 03 Aug .................... +0.5 ... 15 Dec ............... -0.3 on 26 Nov 1989

1991 ... 20.6 ... 11 & 29 July ............ -4.7 ... 07 Feb ................ -4.7 on 07 Feb 1991
1992 ... 20.4 ... 29 June ................... -2.3 ... 22 Jan ................ -3.5 on 12 Dec 1991
1993 ... 19.4 ... 10 June .................. -2.9 ... 23 Nov ................ -2.4 on 29 Dec 1992
1994 ... 20.6 ... 24 July .................... -1.9 ... 14 Feb ................ -2.9 on 23 Nov 1993
1995 ... 24.9 ... 01 Aug .................... -4.7 ... 28 Dec ................ -1.2 on 3 Jan 1995
1996 ... 22.1 ... 19 Aug .................... -2.2 ... 07 Feb ................ -4.7 on 28 Dec 1995
1997 ... 22.6 ... 11 Aug .................... -2.6 ... 01 Jan ................ -2.6 on 01 Jan 1997
1998 ... 20.5 ... 11 Aug .................... -0.3 ... 06 Dec ............... +0.2 on 01 Feb 1998
1999 ... 21.7 ... 31 July .................... -2.2 ... 20 Dec ................-0.3 on 06 Dec 1998
2000 ... 21.5 ... 19 June .................. -1.9 ... 29 Dec ................ -2.2 on 20 Dec 1999

2001 ... 23.0 ... 29 July .................... -1.2 ... 16 Jan ................ -1.9 on 29 Dec 2000
2002 ... 21.6 ... 29 July .................... -1.8 ... 01 & 02 Jan ........ -1.8 on 1 & 2 Jan 2002
2003 ... 23.9 ... 09 Aug .................... -1.4 ... 07 Jan ................ -1.4 on 07 Jan 2003
2004 ... 21.7 ... 08 Aug ................... +0.5 ... 29 Jan & 20 Dec.. +0.5 on 30 Dec 2003 & 29 Jan 2004
2005 ... 22.1 ... 19 June .................. -1.0 ... 29 Dec ................ +0.4 on 23 Feb 2005
2006 ... 24.5 ... 19 July .................... -1.4 ... 02 Feb ................ -1.4 on 2 Feb 2006
2007 ... 19.7 ... 05 Aug .................... -1.5 ... 07 & 08 Feb ....... -1.5 on 7 & 8 Feb 2007
2008 ... 21.1 ... 28 July .................... -2.5 ... 31 Dec ................ -0.5 on 21 Dec 2007
2009 ... 22.5 ... 01 July .................... -3.0 ... 06 Jan .................-3.0 on 6 Jan 2009
2010 ... 19.9 ... 10 July .................... -7.0 ... 20 Dec ................ -4.6 on 7 Jan 2010

2011 ... 22.0 ... 27 June ................... -1.4 ... 29 Jan ................ -7.0 on 20 Dec 2010
2012 ... 20.3 ... 18 Aug .................... -3.0 ... 04 Feb ............... -3.0 on 4 Feb 2012
2013 ... 22.7 ... 01 Aug .................... -2.9 ... 12 Jan ................ -2.9 on 12 Jan 2013

2014 ... 21.0 ... 18 July .................... +0.8 ... 29 Dec ............... +2.5 on 23 Nov 2013

2015 ... 24.6 ... 01 July ..................... -0.3 ... 2 Feb .................. -0.3 on 2 Feb 2015

2016 ... 23,5 ... 20 July ...................... +0.3 .. 16 Jan ............... +0.3 on 16 Jan 2016

2017 ... ??? .... ???? ..........................--0.1 ... 26 Jan (so far) >> --0.1 on 26 Jan 2017

updated through 10 Mar 2017

Edited by Roger J Smith
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Summary of the Annual extremes (see last four posts for tables)

Highest Daily Mean for each of 245 years 1772 to 2016

The range of dates is 15 May (1833, tied) to 01 October (1985).

The count by month (assigning 0.5 to tied values in different months) is

MAY .. 3.5 (4)

JUN .. 46.0 (47)

JUL .. 107.5 (110)

AUG .. 75.0 (76)

SEP .. 12.0 (13)

OCT ... 1.0 (1)

The number in brackets gives the number of years in which the month at least shares in the category of highest daily mean. For example, August had two cases of dates tied with other months, so the count was 75.0, the number of cases was 76. A case where a month has more than one day does not affect this, there were about half a dozen such cases, usually consecutive days or nearby days in a warm spell. One year actually had three days tied, all in July.

Despite July coming ahead of August in this count, the highest frequency on any one date is 8 on the 12th of August. Other dates that scored five or more include 5 June (5), 5 July (7), 9, 12, 16, 17 July (all made it to five with one tie included), 20. 22, 24 and 29 July (all at 6) , and 5 Aug (5). There seems to be a little flicker of warmth near the end of September into the first of October given that one case fell in the period 15-26 September, then three from 27 Sep to 1 Oct.

Periods with very few annual extremes within the summer months include 11-14 June (zero) and from 21 to 26 August which totalled 5.0 including two ties. The frequency after that period is not much greater but given the seasonal distribution that part of August stands out a bit. There are ten cases between 27 August and 2 September.

The trend of these values is gradually increasing although the period 1975 to 2006 stands out in recent times, since 2007 (to 2012 as originally posted) of course the performance of this index is nothing out of the ordinary as the long-term average is 20.9 while the average since 1901 is 21.1 ... in the warmer period 1975 to 2006 the average was 21.9. The past six summers (meaning 2007-12) have averaged 20.9, equal to the long-term average. The period 2013-16 then warmed to 23.0 so the past ten years have continued near the 1975-2006 pace, at 21.7.

The highest extremes are probably a lot better known to weather "buffs" than the lowest annual max values, so I had a look at those. 1860 and 1862 stand out with 17.2 and 17.3 the best those years could manage. A more recent period of cool summers appears 1962-66, five years when the value 20.0 was never achieved.

 

__Annual Minimum Daily Means 1772-2017 and coldest of winter seasons__

Two notes here, 2017 is of course not yet over so the value of -0.1 in January is not "set" and this table could therefore change. It is probably settled in as the coldest of winter 2016-17. Also, 1786 could have had a value in December, the data are missing, but it is not as likely as the winter seasonal minimum for 1786-87 which I have assigned to December on probability (see the table for that period for details).

Not every annual minimum is a winter minimum, but there are two cases where a year managed to secure two different coldest of winter from tied values at either end of the year. There are numerous cases where a year claims two winters, as well as those where it claims no winters.

The following count for coldest mean daily per year follow the same logic as the max, the number includes 0.5 for ties in different months, and the number in brackets gives the number of times the month at least had a share.

NOV ... 13.5 (14)

DEC ... 74.5 (76)

JAN .. 104.5 (107)

FEB ... 49.0 (50)

MAR ... 4.5 (5)

Despite the fact that January and February CET means are often very close in 30-year periods and not that different (3, 4) over a longer term, January and even December score higher than February on this index. A small part of the reason is length of month, February has only 90% of the time available, but probably the bigger reason is solar angle, a cold February day can achieve a somewhat higher maximum.

The most frequent date for the annual minimum is 1 Jan (count 8.0, 9 instances, so twice this date tied both times with 2 Jan). 28 December had a count of 7.5 with 8 instances. 22 December scored six while 23 January scored five and otherwise the count remains fairly even at about 2-4 per day through the heart of the winter season which appears to be 15 Dec to 15 Feb.

In the heart of the winter season, the dates that did least well at scoring a coldest of year include 3 and 5 Feb around the time when the annual temperature curve shows a bit of a spike.

The range of dates is 9 Nov (1921) to 21 March 1872 (later tied on 11 Dec).

The average of this annual minimum over the entire 245-year period is -3.7, and this has risen to reach -3.0 since 1901. From 1988 to 2007 a two-decade mean of -1.6 was observed, but this has fallen back to -2.0 for the twenty-five years 1988-2012. For a ten-year period 1795 to 1804, the average was as low as -6.0 ... and this appears to be about the same value that other colder periods have had, although most of those did not last ten years, for example, 1890-95 (six years) managed an average of -6.3. The ten-year average of -4.6 from 1978 to 1987 was not often bettered in the colder 19th century or late 18th century.

Meanwhile, the winter seasonal count looks very similar, although about one-third of winter seasonal minimum values are not annual minima for their particular year. The various possibilities seem to cancel out almost equally, but February does score a bit higher.

NOV ... 14.5 (15)

DEC ... 69.0 (70)

JAN .... 99.5 (102)

FEB ... 54.0 (55)

MAR ... 9.0 (9)

The range in this variable runs from 12 Nov 1919 (for winter 1919-20) to 21 March 1899 (coldest of winter 1898-99).

Since quite a few years use up two cold annual values in the seasonal count, the long-term mean of this index is higher, at -3.5, and has risen to -2.9 since 1901. The recent winter season values are more similar to the annual values.

Edited by Roger J Smith
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wow what a lot of work Roger, I've skimmed through each post but need to spend more time. The winter data is interesting regarding the frequency of 'cold' values (taking your period as Nov-March which is a reasonable thing to do I think). It may answer some of the, at times, ill founded comments in various threads about which month is statistically colder than another?

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Thanks John, I have been extensively number-crunching for research and these tables are just a diversion from that work which takes up a good chunk of my time, as I try to compare various index values with the same kind of analysis for North American data.

Some day I hope to present some of this here (in a different thread and probably not in this forum).

The winter extremes are from a filter that is actually 1 July to 30 June so if there had been any values in October or April they would have appeared in the tables, but it would no doubt take a very mild winter to get colder days in those months into the mix. I recall seeing a close call on 30 Oct of one winter season (as defined) and there have been days in certain years in October and April that were colder than the highest extremes, but they were nowhere near qualifying in their own season.

Readers should note that I took as much time and care with this as was practical and I hope the results are very accurate but there could be one or two errors given the complexity. The values are produced by defining ranges and searching for MAX and MIN values. The dates were found manually by scrolling through the daily data (first on my file then cross-checked with the source file).

What surprised me the most was the frequency of November coldest of winter and coldest of year values, and several of them not that far back in the record. I would have guessed a lower frequency. I think that for Toronto, the frequency of November extremes in a winter season would be about 1-2 per cent. Here (CET) it comes out at 6%. I was a bit surprised by how January overpowered February although not that surprised maybe. The summer data were more like I had visualized and in terms of distribution seem quite similar to Toronto although the 1 October outlier is not matched, despite a few close calls. On the other hand, 22 April was the warmest day of 1842 in Toronto. But May is not very common as a source of warmest day there either.

If anyone spots an error in these tables, let me know, I think I could get a moderator to edit them.

Edited by Roger J Smith
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LARGEST CHANGES IN DAILY CET (from day to day)

I ran a program on the daily CET values to find out the largest changes from one day to the next, over the period 1772-present.

There were three days that warmed by more than 10 C deg, they were:

Feb 7, 1830 ... 11.2 warmer (4.8 from -6.4)

Jan 4, 1836 ... 10.7 warmer (8.2 from -2.5)

Jan 21, 1838 ... 10.5 warmer (-1.4 from coldest day on record -11.9)

These cover the largest increases for Jan and Feb. The rest of the monthly records are as follows:

Mar. 12, 1805 ... 8.2 warmer (11.5 from 3.3)

Apr. 15, 1868 ... 7.4 warmer (12.9 from 5.5)

May 17, 1854 ... 7.1 warmer (13.1 from 6.0)

June 1, 1869 ... 6.9 warmer (14.4 from 7.5)

July 9, 1903 ... 6.9 warmer (20.2 from 13.3)

Aug. 27, 1864 ... 6.2 warmer (15.0 from 8.8 )

Sep. 4, 1869 ... 7.4 warmer (18.5 from 11.1)

Oct. 21, 1833 ... 7.0 warmer (12.9 from 5.9)

Nov. 26, 1797 ... 9.6 warmer (9.8 from 0.2)

Dec. 8, 1847 ... 8.9 warmer (10.7 from 1.8 )

-------------------

Meanwhile, the largest day to day falls in CET daily means were all less than 10 degrees, the largest was 9.9 degrees in November 1836.

Monthly records are ...

Jan. 6, 1982 ... 8.5 (-0.1 from 8.4)

Feb. 26, 1780 ... 8.0 (-2.4 from 5.6)

Mar. 5, 1821 ... 8.5 (0.7 from 9.2)

Mar. 28, 1777 ... 8.5 (6.3 from 14.8 )

Apr. 16, 1779 ... 8.5 (7.3 from 15.8 )

May 11, 1773 ... 9.1 (4.1 from 13.2)

June 7, 1942 ... 8.3 (12.8 from 21.1)

Jul. 23, 1868 ... 8.5 (14.7 from 23.2)

Aug. 29, 1838 ... 7.2 (11.5 from 18.7)

Sep. 16, 1819 ... 8.6 (8.9 from 17.5)

Oct. 16, 1955 ... 9.3 (3.7 from 13.0)

Nov. 25, 1836 ... 9.9 (0.4 from 10.3)

Dec. 14, 1994 ... 8.9 (2.4 from 11.3)

----------------------------------------------------

Note that the majority of these monthly records were set before 1870 and only a few have occurred recently, and in the lifetime of most people reading this, no day has warmed more than 7 degrees (by mean CET), the largest increase since 1980 is 5.8 deg from 30 Nov. 1985, while there was a 6.4 deg rise on 6 Jan 1971.

Edited by Roger J Smith
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Longest Cold Spells

(consecutive days with means 0.0 or lower)

NOTE -- Data from 1772 to present, there were probably very long cold spells in years such as 1684, 1709 and 1740 but we don't have the daily details for those.

This table includes all cases with 10 or more such days.

DAYS ___ Duration of Days 0.0 or lower _______________ Coldest ______ Average

_________________________________________________________________

32 ... ... 27 Dec 1813 - 27 Jan 1814 ......................................... -- 6.7 ...... -- 3.2

26 ... ... 7 Jan - 1 Feb 1776 ....................................................... -- 7.5 ...... -- 3.0

22 ... ... 5 - 26 Feb 1947 ........................................................... -- 6.7 ...... -- 2.5 ****

20 ... ... 8 - 27 Jan 1881 ........................................................... -- 8.1 ...... -- 4.6

20 ... ... 7 - 26 Jan 1963 ............................................................ --8.4 ...... -- 3.6 ***

18 ... ... 6 - 23 Feb 1855 ............................................................ -- 7.5 ...... -- 3.7

18 ... ... 9 - 26 Jan 1823 ............................................................. -- 8.9 ...... -- 3.0

18 ... ... 9 - 26 Dec 1890 ............................................................. -- 6.8 ...... -- 2.1

17 ... ... 10 - 26 Jan 1795 ........................................................... -- 8.9 ...... -- 4.0

15 ... ... 21 Dec 1868 - 4 Jan 1869 ............................................. -- 6.9 ...... -- 3.6

15... ... 10-24 Jan 1940 .............................................................. -- 7.1 ...... -- 3.3

15 ... ... 24 Dec 1892 - 7 Jan 1893 ............................................ -- 5.0 ...... -- 3.3

15 ... ... 18 Jan - 1 Feb 1784 ....................................................... -- 3.7 ...... -- 2.1

14 ... ... 8 - 21 Jan 1838 ............................................................ -- 11.9 ...... -- 5.1

14 ... ... 5-18 Feb 1895 ............................................................... -- 8.3 ...... -- 4.8**

14 ... ... 3-16 Jan 1820 ............................................................... -- 8.5 ...... -- 3.6

14 ... ... 21 Jan - 3 Feb 1780 ...................................................... -- 3.6 ...... -- 1.0

13 ... ... 26 Jan - 7 Feb 1946 ...................................................... -- 5.0 ...... -- 2.5

13 ... ... 17 - 29 Dec 1860 ............................................................ -- 3.7 ...... -- 2.1

13 ... ... 6 - 18 Feb 1986 ............................................................. -- 4.6 ...... -- 1.6

13 ... ... 14 - 26 Feb 1956 ............................................................ -- 3.2 ...... -- 1.6

13 ... ... 29 Dec - 10 Jan 1811 ..................................................... -- 3.6 ...... -- 1.5

12 ...... 6-17 Jan 1987 ................................................................... -- 7.7 ...... -- 2.6

12 ... ... 23 Dec 1962 - 3 Jan 1963 ............................................... -- 3.6 ...... -- 2.2 ***

12 ... ... 18 - 29 Jan 1880 .............................................................. -- 4.3 ...... -- 2.1

12 ... ... 3 - 14 Feb 1991 ............................................................... -- 4.7 ...... -- 1.9

12 ... ... 25 Dec 1861 - 5 Jan 1862 ............................................. -- 5.0 ...... -- 1.8

12 ... ... 30 Nov - 11 Dec 1796 .................................................... -- 4.7 ...... -- 1.8

12 ...... 17 - 28 Feb 1955 ............................................................. -- 3.3 ...... -- 1.7

11 ...... 17 - 27 Dec 2010 ............................................................. -- 7.0 ...... -- 3.9

11 ...... 11 - 21 Jan 1867 ................................................................ -- 5.0 ...... -- 2.9

11 ... ... 1 - 11 Feb 1917 ................................................................ -- 7.2 ...... -- 2.8 *

11 ... ... 9 - 19 Feb 1985 .............................................................. -- 4.1 ...... -- 2.7

11 ... ... 2-12 Jan 1877 ................................................................. -- 4.8 ...... -- 2.3

11 ... ... 6 - 16 Jan 1850 ............................................................... -- 2.8 ...... -- 1.4

11 ... ... 25 Dec 1820 - 4 Jan 1821 .............................................. -- 3.3 ...... -- 1.3

11 ... ... 11 - 21 Feb 1853 ............................................................. -- 3.2 ...... -- 1.2

11 ... ... 9 - 19 Feb 1940 ............................................................... --2.5 ........ -- 1.1

10 ...... 6-15 Jan 1982 ................................................................... --7.6 ...... -- 4.0

10 ... ... 8 - 17 Jan 1826 ................................................................-- 6.9..... -- 3.7

10 ... ... 20 - 29 Jan 1945 .............................................................. -- 7.6 ...... -- 3.5

10 ... ... 5 - 14 Dec 1844 ............................................................... .-- 5.5 ...... -- 2.7

10 ... ... 8 - 17 Dec 1876 ................................................................ -- 5.3 ...... -- 2.9

10 ... ... 16 - 25 Jan 1829 ............................................................... -- 4.8 ...... -- 2.8

10 ... ... 14 - 23 Jan 1809 ............................................................... -- 5.1 ...... -- 2.4

10 ... ... 24 Dec 1836 - 2 Jan 1837 ................................................. -- 3.3 ...... -- 1.3

10 ... ... 23 Dec 1837 - 1 Jan 1838 ................................................. -- 2.7 ...... -- 1.4

10 ... ... 21 - 30 Jan 1917 ............................................................... -- 1.8 ...... -- 1.1 *

__________________________________________________

* Except for +0.3 on 31 Jan 1917, a 22 day spell avg --1.8 C lasting 21 Jan to 11 Feb.

** A longer spell of 24 days with +0.4 as warmest, 26 Jan - 18 Feb 1895, avg --3.7 C.

*** Although there were only two spells in winter 1962-63 that qualified for this list, note that the period of 35 days that includes the two, 23 Dec to 26 Jan, averaged -2.7 C and 70 days to 2 March averaged -- 1.5 C.

**** The 45-day period 23 Jan to 8 Mar 1947 averaged --1.9 C.

>> RECENT NEAR MISSES & EXPANSION OF 1986 FROM LIST <<

25 Nov to 4 Dec 2010 averaged -- 1.7 C and 25 Nov to 8 Dec averaged -- 1.7 C but these periods failed by a slight margin to make the list (25 Nov was +0.3 and 5 Dec was +0.4).

The 26-day period from 6 Feb to 3 Mar 1986 averaged -- 1.2 C.

1 to 10 Jan 2010 averaged --1.9 C but failed to make the list because 2 Jan was +0.3 C.

8-26 Dec 1981 averaged -- 2.3 C.

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Longest Hot Spells

 

This table lists all spells with mean daily CET values at or above 20.0 C lasting at least seven days, in the period 1772 to 2012. Rank by length and as second determinant max value.Actual values in brackets are not in the qualifying period but added at either end to illustrate longevity of warm spell when these end days are  >19C. Where end days are cooler than 19, no entries appear in brackets.

 

The duration of the qualifying hot spells refers to the dates not in brackets, those dates can be derived from counting backward or forward from end dates.

 

Rank __ Period ___________________ Actual values with warmest in bold

 

1 ___ 14d __ 25 June to 8 July 1976

_______ (20.7,19.2) 21.0,22.3,22.5,22.6,22.4,22.1,22.9,22.8,24.6,24.7,23.9,23.3,22.6,21.4 (19.4)

_________and seven further very warm days mainly above 18, a total spell of 24 very warm days.

2 ___ 10d __ 8 Jul to 17 Jul 1983

_______(19.1,19.3,19.7) 20.3,20.6,20.3,21.6,22.6,22.7,22.1,22.4,22.5,21.2 (19.8.)

_________ a total of 14 very warm days.

3 ____ 9d __ 4 Aug to 12 Aug 2003

_______20.5,23.1,22.5,21.5,21.1,23.9,22.4,21.4,21.4 (19.1) (a total of 10d)

4 ____ 8d __ 28 Jul to 4 Aug 1995

_______ (20.5,20.5,19.5) 20.2,21.1,21.2,23.4,24.9,24.6,23.4,20.5 (total of 11d)

5 ____ 8d __ 12 Jul to 19 Jul 1808

________22,4,24.5,24.4,20.7,22.0,20.2,21.2,21.7

6 ____ 8d __ 6 Aug to 13 Aug 1997

________ 20.1,21.5,22.0,21.7,22.5,22.6,21.5,20.6 (part of 18d spell)

7 ____ 8d __ 15 Aug to 22 Aug 1947

____ ____ (19.7,19.3) 20.4,21.6,22.0,22.1,20.9,20.0,20.1,20.0 (19.1) a total of 11 very warm days.

8 ____ 7d __ 3 Aug to 9 Aug 1975

____ ____ (19.3,19.8.) 22.0,23.4,22.1,20.8,22.8,23.7,21.0** (total of 9d)

9 ____ 7d __ 16 Aug to 22 Aug 1995

________ (19.1) 20.4,20.8,21.7,22.1,21.9,21.4,21.4 (13d starting 10 Aug to 22 Aug generally above 19)

 

These are all cases where all but one day (seven or more in total) hit 20.0, regardless of value of cooler day. Spells may contain two cooler days if total length exceeds ten. Rank by length and as second determinant max value. Ranks refer to the length of qualifying period. By definition, all six day spells of consecutive 20+ days are included. That would extend the ranking of the above list as follows. Spell 1 below ranks 10, spell 3 ranks 11, spell 4 ranks 12, and spell 7 ranks 13th for consecutive 20+ days.

 

Rank __ Period ___________________ Actual values with warmest in bold

 

1 ___ 11d __ 17 Jul to 27 Jul 2006 ____

________(19.3) 20.9,22.1,24.5,22.7,21.7,21.9,19.6,20.0,22.7,23,2,21,2 (19.8,19.5,19.0) 15 days in total

2 ___ 11d __ 6 Jul to 16 Jul 1793

________20.0,21.9,20.0,17.6,20.6,20.3,20.7,20.3,18.8,20.6,22.2,(19.8.) (12d incl 17th)

3 ____ 7d __ 14 Jul to 20 Jul 1825

___ _____ (19.2,19.6),20.0,23.7,21.3,21.2,23.3,23.5,19.7

4 ____ 7d __ 20 Jul to 26 Jul 1989

_________ 20.5,22.7,23.1,22.4,22.1,21.3,19.1

5 ____ 7d __ 12 Aug to 18 Aug 1893

_________ 20.2,19.8,21.1,22.1,21.0,22.0,22.6 (19.6)*

6 ____ 7d __ 16 Aug to 22 Aug 1997

_________ (19.0,19.2) 20.3,20.6,20.8,22.1,21.2,19.4,20.3 (19.7) (see above, 18d spell in total)

7 ____ 7d __ 6 Jul to 12 Jul 1934

_________ 20.2,20.9,20.4,20.4,20.3,20.2,19.3

 

_________________________________________________

 

14 days from 26 June to 9 July 1826 were warmer than 19.3, the spell failed to qualify above, max 22.8 on 27 June.

 

14 days from 7 to 20 July 1921 were warmer than 18.0, the spell failed to qualify above, max 22.3 on 18 July.

 

13 days from 4 July to 16 July 1852 were warmer than 18.5, the spell failed to qualify above, max 24.0 on 5 July.

 

*12 days from 8 Aug to 19 Aug 1893 were warmer than 18.4, the spell produced a 7d qualifying period above.

 

** 20 days from 27 July to 15 Aug 1995 were warmer than 18.2 and the 7 days 3-9 Aug qualified with consecutive days above 20, other separate periods would not have qualified for the "almost" section.

 

Not all hot summers have lengthy spells above 19, for example, July 1868 had numerous days above 19.0 but spells of only 5 or 6 days with interruptions. Then July and August 1911 had many hot days but again, no qualifying spells, the closest was 8 days 7-14 August where five were above 20 but not consecutively.A nine day spell in July 1923 (6-14 Jul) also failed to qualify despite six (non-consecutive) days above 20 and a max of 24.0 on the 13th. The hottest day on record in late July 1948 (25.2, 29th) was part of five conseutive days above 20 but that spell failed to start and end with qualifying days and was relatively isolated otherwise. A similar outcome was found the next July (1949) from 23rd to 27th although this was a less intense hot spell. The hot spell in August 1990 was only four days of 20+ days and two others over 18. Five hot days 10-14 July 2005 also fell short.

 

An early summer period that failed to qualify was seven days from 29 May to 4 June 1947, there were five non-consecutive days above 20 in that spell.

Edited by Roger J Smith
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From the above and other investigations, I have estimated that the probability of at least one spell of 20.0 C or higher mean CET would be close to the following (more of a smoothed distribution than actual towards the higher values):

 

1 day .... 80%

2 days ... 45%

3 days ... 22%

4 days ... 10%

5 days ... 7%

6 days ... 5%

7 days ... 3%

 

10 days ... about 1%

 

15 days ... about 0.2% or one in 500.

 

The climate seems to be able to sustain 30-day periods with all CET averages above 17 or 18 but would be hard pressed to manage 20 consecutive days at 20.0 C or higher.

 

It is noticeable that the longer spells seem to settle into very similar values, not to each other but within the spells.

 

The frequency of long hot spells has obviously increased and was very low from about 1830 to 1970. It peaked quite anomalously in the period 1975 to 2006 but was also well represented in the much earlier period 1793 to 1825 which is more or less the Dalton minimum, oddly enough. This may illustrate that a cold, dry climate regime has a tendency to gather some hot, dry summer analogues in somewhat similar patterns.

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Longest Hot Spells This table lists all spells with mean daily CET values at or above 20.0 C lasting at least seven days, in the period 1772 to 2012. Rank by length and as second determinant max value.Actual values in brackets are not in the qualifying period but added at either end to illustrate longevity of warm spell when these end days are  >19C. Where end days are cooler than 19, no entries appear in brackets. The duration of the qualifying hot spells refers to the dates not in brackets, those dates can be derived from counting backward or forward from end dates. Rank __ Period ___________________ Actual values with warmest in bold 1 ___ 14d __ 25 June to 8 July 1976_______ (20.7,19.2) 21.0,22.3,22.5,22.6,22.4,22.1,22.9,22.8,24.6,24.7,23.9,23.3,22.6,21.4 (19.4)_________and seven further very warm days mainly above 18, a total spell of 24 very warm days.2 ___ 10d __ 8 Jul to 17 Jul 1983_______(19.1,19.3,19.7) 20.3,20.6,20.3,21.6,22.6,22.7,22.1,22.4,22.5,21.2 (19.8.)_________ a total of 14 very warm days.3 ____ 9d __ 4 Aug to 12 Aug 2003_______20.5,23.1,22.5,21.5,21.1,23.9,22.4,21.4,21.4 (19.1) (a total of 10d)4 ____ 8d __ 28 Jul to 4 Aug 1995_______ (20.5,20.5,19.5) 20.2,21.1,21.2,23.4,24.9,24.6,23.4,20.5 (total of 11d)5 ____ 8d __ 12 Jul to 19 Jul 1808________22,4,24.5,24.4,20.7,22.0,20.2,21.2,21.76 ____ 8d __ 6 Aug to 13 Aug 1997________ 20.1,21.5,22.0,21.7,22.5,22.6,21.5,20.6 (part of 18d spell)7 ____ 8d __ 15 Aug to 22 Aug 1947____ ____ (19.7,19.3) 20.4,21.6,22.0,22.1,20.9,20.0,20.1,20.0 (19.1) a total of 11 very warm days.8 ____ 7d __ 3 Aug to 9 Aug 1975____ ____ (19.3,19.8.) 22.0,23.4,22.1,20.8,22.8,23.7,21.0** (total of 9d)9 ____ 7d __ 16 Aug to 22 Aug 1995________ (19.1) 20.4,20.8,21.7,22.1,21.9,21.4,21.4 (13d starting 10 Aug to 22 Aug generally above 19) These are all cases where all but one day (seven or more in total) hit 20.0, regardless of value of cooler day. Spells may contain two cooler days if total length exceeds ten. Rank by length and as second determinant max value. Ranks refer to the length of qualifying period. By definition, all six day spells of consecutive 20+ days are included. That would extend the ranking of the above list as follows. Spell 1 below ranks 10, spell 3 ranks 11, spell 4 ranks 12, and spell 7 ranks 13th for consecutive 20+ days. Rank __ Period ___________________ Actual values with warmest in bold 1 ___ 11d __ 17 Jul to 27 Jul 2006 ____________(19.3) 20.9,22.1,24.5,22.7,21.7,21.9,19.6,20.0,22.7,23,2,21,2 (19.8,19.5,19.0) 15 days in total2 ___ 11d __ 6 Jul to 16 Jul 1793________20.0,21.9,20.0,17.6,20.6,20.3,20.7,20.3,18.8,20.6,22.2,(19.8.) (12d incl 17th)3 ____ 7d __ 14 Jul to 20 Jul 1825___ _____ (19.2,19.6),20.0,23.7,21.3,21.2,23.3,23.5,19.74 ____ 7d __ 20 Jul to 26 Jul 1989_________ 20.5,22.7,23.1,22.4,22.1,21.3,19.15 ____ 7d __ 12 Aug to 18 Aug 1893_________ 20.2,19.8,21.1,22.1,21.0,22.0,22.6 (19.6)*6 ____ 7d __ 16 Aug to 22 Aug 1997_________ (19.0,19.2) 20.3,20.6,20.8,22.1,21.2,19.4,20.3 (19.7) (see above, 18d spell in total)7 ____ 7d __ 6 Jul to 12 Jul 1934_________ 20.2,20.9,20.4,20.4,20.3,20.2,19.3 _________________________________________________ 14 days from 26 June to 9 July 1826 were warmer than 19.3, the spell failed to qualify above, max 22.8 on 27 June. 14 days from 7 to 20 July 1921 were warmer than 18.0, the spell failed to qualify above, max 22.3 on 18 July. 13 days from 4 July to 16 July 1852 were warmer than 18.5, the spell failed to qualify above, max 24.0 on 5 July. *12 days from 8 Aug to 19 Aug 1893 were warmer than 18.4, the spell produced a 7d qualifying period above. ** 20 days from 27 July to 15 Aug 1995 were warmer than 18.2 and the 7 days 3-9 Aug qualified with consecutive days above 20, other separate periods would not have qualified for the "almost" section. Not all hot summers have lengthy spells above 19, for example, July 1868 had numerous days above 19.0 but spells of only 5 or 6 days with interruptions. Then July and August 1911 had many hot days but again, no qualifying spells, the closest was 8 days 7-14 August where five were above 20 but not consecutively.A nine day spell in July 1923 (6-14 Jul) also failed to qualify despite six (non-consecutive) days above 20 and a max of 24.0 on the 13th. The hottest day on record in late July 1948 (25.2, 29th) was part of five conseutive days above 20 but that spell failed to start and end with qualifying days and was relatively isolated otherwise. A similar outcome was found the next July (1949) from 23rd to 27th although this was a less intense hot spell. The hot spell in August 1990 was only four days of 20+ days and two others over 18. Five hot days 10-14 July 2005 also fell short. An early summer period that failed to qualify was seven days from 29 May to 4 June 1947, there were five non-consecutive days above 20 in that spell.

interesting that only 1 year 1995 shows two such periods?
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