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Just as a benchmark for cold, these are all the sub-5.0 lowest averages for 24 to 26 April (and the daily records which belong to the coldest two -- snow fell with these for certain -- 1908 was by a wide margin the coldest):

rank _ YEAR ____ AVG CET ___ incl record (bold) for date (non- records in ital)

 1 ___ 1908 ______ 2.23 ______ 0.5, 1.8, 4.4

 2 ___ 1981 ______ 3.37 ______ 3.5, 3,3, 3.3

 3 ___ 1989 ______ 3.97 ______ 3.1, 3.6, 5.2

 4 ___ 1873 ______ 4.03 ______ 3.2, 3.2, 5.7

 5 ___ 1808 ______ 4.30 ______ 5.2, 3.2, 4.5

 6t___ 1827 ______ 4.43 ______ 3.9, 4.4, 5.0

 6t___ 1906 ______ 4.43 ______ 4.2, 5.3, 3.8

 6t___ 1950 ______ 4.43 ______ 5.3, 3.2, 4.8

 9 ___ 1853 ______ 4.83 ______ 5.7, 4.0, 4.8

10___ 1857 ______ 4.87 ______ 5.5, 5.3, 3.8, 3.3, 3.1 (colder 27th-28th).

 

(same tables, four day interval 24-27 April)

rank _ YEAR ____ AVG CET ___ incl record (bold) for date (non- records in ital)

 1 ___ 1908 ______ 2.95 ______ 0.5, 1.8, 4.4, 5.1

 2 ___ 1981 ______ 3.88 ______ 3.5, 3,3, 3.3, 5.4

 3 ___ 1808 ______ 4.15 ______ 5.2, 3.2, 4.5, 3.7

 4 ___ 1857 ______ 4.48 ______ 5.5, 5.3, 3.8, 3.3, 3.1 (colder 28th).

 5 ___ 1873 ______ 4.63 ______ 3.2, 3.2, 5.7, 6.4

 6 ___ 1989 ______ 4.68 ______ 3.1, 3.6, 5.2, 6.8 

 7 ___ 1906 ______ 4.68 ______ 4.2, 5.3, 3.8, 5.4

 8 ___ 1950 ______ 4.98 ______ 5.3, 3.2, 4.8, 6.6

 9 ___ 1853 ______ 5.23 ______ 5.7, 4.0, 4.8, 6.4

(13t___1827 ______ 5.53 ______ 3.9, 4.4, 5.0, 8.8 )

Three years not in the original table moved ahead of 1827 when the fourth day was added, those were

10. 1888 (5.38), 11. 1860 (5.45), 12. 1799 (5.50), also two others were tied with 1827 (1778, 1813)

In recent years 2016 had the lowest averages, 6.4 (24-26) and 5.93 (24-27) (the 27th was only 4.5 last year and the 28th only 3.9). The three days 26th-28th in 2016 (avg 4.5) would rank 5th coldest had they occurred three days earlier. As it happened, they ranked tied for fourth coldest with 1919 for that period behind 1857 (3.4), 1782 (4.23) and 1808 (4.47). 

(added in edit) ... the 25th to 27th averaged 5.0 (4.5, 5.0, 5.5) in 2017. The 24th at 8.3 made the comparisons with the tables above 5.93 (24-26) and 5.83 (24-27). 

As cold as that was in 2016, the first five days of May 1979 were colder (avg 4.3).

Coldest 27th to 29th was 1826 with 3.8 (from 4.6, 3.0, 3.8). 

Very cold spells at the end of the month include 28th-30th of 1782 (3.2, 3.1, 3.8). avg 3.37

... 1808 stayed cold with 5.2, 4.0, 5.5 to end the existing cold spell (see tables above). avg 4.9

... 1856 had one very cold day (29th at 0.7) and this anchored an average of 4.07 for the last three days.

... 1945 averaged 3.87 (from 4.8, 4.2 and daily record for 30th 2.6).

... In 1951 the last three days were 5.0, 5.0 and 4.4 C. (avg 4.8).

Record low for 27th was 2.7 in 1919 -- this cold spell did not quite make the tables (3d avg for 24-26 was 6.6, 4d for 24-27 was 5.6).

(record lows are all in the discussion but this will put them into easier recovery mode, I included 23rd since the 1908 cold spell began then).

23rd __ 2.6 1908

24th __ 0.5 1908

25th __ 1.8 1908

26th __ 3.3 1981

27th __ 2.7 1919

28th __ 3.0 1826

29th __ 0.7 1856

30th __ 2.6 1945

 

Edited by Roger J Smith
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9.1c here to the 22nd, 1.3c above the 1981-2010 average.

Today looks mild so 9.2c likely by tomorrow, then we see potential for 3/4 days of drops so I would imagine somewhere around 8.5c by the end of the coming week/month.

 

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If my theory of how they adjust CET values is correct, today will get a big downward correction, as the minimum is likely to fall quite a bit this evening from what it has been so far today. Something to check at the end of the month. Every downward correction of 3 deg is worth 0.1 downward adjustment, so let's say the provisional value for today is 7 and the final value is 4, that with no other changes would reduce the CET by 0.1 at end of month. Two or three days that add up to 3 deg have the same impact. The sort of day that might get an upward correction would be turning milder through the night and possibly into the evening also. However, I also think there are corrections just based on examination of all data available that don't fit these rules. 

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2 hours ago, cheeky_monkey said:

As requested by some who have asked to know.

Here it still stands at +2.6c..which is 3.4c below normal.

Good to know that someone is experiencing a below average month!

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8.9c here to the 25th, 1.1c above the 1981-2010 average.

Should see it drop slightly before month end if BBC temp forecast are accurate.

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Sunny Sheffield heading towards average 8.7C just 0.3C above average. This the 81- 00 average. Interesting if we keep around the normal 0.8C difference from the final cet value.

Edited by The PIT
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I haven't got much time for the usual updates so I'll keep this a bit short.

The 12z GFS would have a CET of about 8.9C (8.87) before corrections. Most of the minima have been higher than forecast during this cold spell, with the last 2 minima about 2C higher, so I wouldn't be surprised if we actually finish the month closer to 9C. 

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Just been explaining to my dad that temperatures for April are running somewhat above average to the 25th, and he said that he finds that hard to believe because of how cold it's been lately. I'm trying to think of a way to explain to him how it works.

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11 minutes ago, snowray said:

This spell of weather has not been anywhere near as cold as expected, not surprised though. Finnish above 9c I'd say.

Not surprised either.  Difficult to get genuine cold spells in recent years, especially from these so called 'Arctic blasts'.......

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23 minutes ago, Don said:

Not surprised either.  Difficult to get genuine cold spells in recent years, especially from these so called 'Arctic blasts'.......

It's very strange that all of our cold blasts get either shifted east of end up just to the east in the Atlantic. It's as if the models know wheat to expect but the weather does something else even at short notice. :cc_confused:

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8.8c here to the 26th, 1.0c above the 1981-2010.

Mean Temp currently at its lowest so far this month, looking like finishing around 8.6c roughly.

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