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September 2015 - Monthly Statistics

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A brief summary here:

 

September 2015 - overall a cooler than average autumn month with some notably below average minima. It was however fairly sunny and dry.

 

Days with:

 

Frost: 0

Rain (>1mm): 9

Strong winds (>40 mph gusts): 0

Thunder: 1

Hail: 0

No sun: 3

Snow falling: 0

Snow accumulating: 0

Fog: 1

 

Temperatures:

 

Highest maxima: 21°C (10th)

Lowest maxima: 14°C (14th)

Highest minima: 10°C (11th)

Lowest minima: 4°C (26th)

 

Mean maxima: 16.80°C

Mean minima: 7.50°C

Overall mean: 12.15°C - 1.53°C below the 1981-2010 average - coolest September on record

 

Air pressure at 18:00:

 

Highest air pressure: 1037mb (29th)

Lowest air pressure: 989mb (16th)

 

Graphs:

 

post-21671-0-88941900-1443723185_thumb.p post-21671-0-40484900-1443723185_thumb.p

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Cantley September 2015

 

A month with few days of rain but just a touch above average total; totally dry for last 10 days.

Mean T above average as was maximum. Last 4 morning’s thick fog, quite unusual for that consecutive number in any month

Mean=13.6 (13.0)

Avge Max=19.2 (17.8) Highest daytime=10th with 23.6 and coldest=14th with 14.8

Avge Min=8.1 (8.2) Coldest night=26th with 4.7 and warmest=12th with 12.8

 

Just 6 days with any rain at all, 7 with 0.2 mm or more and 6 with 1.0 mm or more. The wettest day was 15th with 7.8 mm.

No thunder or frost hail or snow but 6 days with fog at 0900 clock time

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september_zps3kdyngtg.png

 

September - Hobart, Tasmania

A mild and dry start to spring. The mean temperature was +0.7C above average ( 1981-2010 ) , rainfall less than half of the long term average ( 1882-2014 ).

 

Average maximum:  16.2 ( +0.8 )

Average minimum:  7.4 ( +0.5 )

Rainfall:  25mm ( average 53mm )

Rain days ( +1mm ):  8/from 12

 

Extensive high pressure across southern Australia with only a shower or two on weakening fronts, with quick clearance. After a cold and snowy August, only one day this month saw fresh snow about the mountain range, with a dusting to 600m level on the 22nd. Snow patches from winter remain above about 1100m. What was turning out to be a near historically dry month was broken when a cut off low developed to the west before crossing the island, to be over the Tasman Sea on the 28-29th. 14mm fell over these two days, more than half othe month's total rain count. A significant warm day occured on the 14th with a high of 26.9C - the second highest temperature recorded for the first half of September. In the valleys to the north of Hobart it was almost 1C warmer, a new Tasmanian record for this time period.

 

Extremes in daily temperature for September

Highest maximum:  26.9....14th ( Record 31.0 in 1987 )

Lowest maximum:  10.6....22nd ( Record 6.1 in 1885 )

 

Highest minimum:  15.0....15th ( Record 18.0 in 1973 )

Lowest minimum:  2.3....4th ( Record -0.8 in 1897 )

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My statistics for central Reading in September 2015:

Average maximum: 18.1
Average minimum: 9.1
Average for month: 13.6

Highest maximum: 21.6 (September 10)
Lowest maximum: 13.9 (22)
Highest minimum: 15.4 (12)
Lowest minimum: 4.1 (26)

Air frosts: none recorded.
Fog recorded at 9am on 1 day (September 20)
No thunder heard.

Rainfall: Reading University shows 45mm for the month, which is about 90% of average.
Sunshine: Reading University shows 161 and 169 hours for the month on their two recorders, about 120% of average.
 
The main feature of September 2015 was the absence of warm weather, with both maxima and minima around 1.5 deg C below the long-term mean.  The month was notable for its consistently cool temperatures and some cold nights - the highest temperature recorded all month was 21.6C on the 10th, which is exceptionally low.  September 2015 was slightly drier than average and quite sunny (in fact sunnier than the poor August we've just had), with a settled spell from the 4th to the 13th and a dry and sunny last week with none of the early fog reported in other parts of the UK.

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For YATTON, North Somerset

 

Description:

 

01st-05th

The month began with a showery northerly. Showers were heavy on the 01st with hail and thunder in the afternoon, these continued into the 02nd as rain. The 03rd to the 05th was drier but remained cool with minimal sunshine. 

 

06th-11th

A more settled period ensued. At first it was very sunny with maximum hours of sun on the 06th and 07th with chilly night (07.3C on the 06th), but cloudy quickly became an issue by the 08th. The 09th continued with sunny 'intervals' rather than lengthy periods. The 10th was sunnier and, with a more southeasterly feed, achieved 23.6C, the highest temperature of the month. The 11th continued warm with increasing cloud from the southwest.

 

12th-18th

Unsettled conditions returned with overnight rain clearing to showers on the 12th followed by a brighter afternoon with a strong breeze. The 13th was calmer but cloudy with intermittent spells of light rain. A deep low arrived on the 14th with its attendant weather conditions. Very heavy downpours continued throughout the day; torrential rain led to flooding locally in the afternoon along with strong winds. 31.4mm was recorded on this day. Early showers moved through on the 15th before clearing later with sunny intervals. This location was on the edge of an active weather system affecting the southeast on the 16th; the day was dull and breezy with period of light rain later. This moved away with a showery westerly on the 17th and 18th. It became sunnier throughout the 18th.

 

19th-20th

A brief ridge of high pressure brought a settled weekend. The 19th dawned foggy but legnthy sunny spells lifted the temperature to 22.6C in the afternoon. A southerly breeze picked up on the 20th with increasing cloud throughout the day.

 

21st-24th

Rain returned on the 21st, albeit light at first. Heavier rain moved through early on the 22nd, a squall line bringing temporarily strong winds to the region. The afternoon was brighter. It was a cool start on the 23rd with 05.9C but the day was predominantly dry and bright with a brisk westerly wind. Showers became very heavy on the 24th as winds were straight off the Severn Estuary. It was windy in the afternoon.

 

25th-30th

The final leg of the month brought a much quieter spell of weather with warm days of sunshine and cool nights. It was misty early on the 25th. An easterly breeze picked up throughout the day on the 29th and was most prevalent on the 30th.

 

Overall

A very typical September with the month split 50/50 between settled and unsettled. The month was notable by its cool nights which contributed to the overall CET value across the country. The month was also more enjoyable due its variety. Oddly, it came out sunnier than August.

 

Stats:

 

Average Max: 19.5C

Average Min: 09.9C

 

Highest Max: 23.6C (10th)

Highest Min: 13.0C (12th)

Lowest Max: 15.5C (22nd)

Lowest Min: 05.9C (23rd)

 

Total Rain: 65.9mm (78%)

Wettest Day: 31.4mm (14th)

 

Longest Period of Consecutive Wet Days: 4 days (14th-17th)

Longest Period of Consecutive Dry Days: 9 days (03rd-11th)

 

Total Sunshine: 156.7 hours

Sunniest Day: 11.0 hours (06th)

Dullest Day: 00.5 hours (03rd) 

 

Highest Gust: 26mph (14th)

Average Barometer: 1017.2mm

 

Days with Rain: 10

Days with Snow falling: 0

Days with Snow lying: 0

Days with Hail: 1

Days with Thunder: 1

Days with a Thunderstorm: 0

Days with Frost: 0

Days with Fog: 2

 

Days <15C: 0

Days <20C: 16

Days >20C: 14

Days >25C: 0

Days >30C: 0

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September 2014 Statistics

 

Below are the statistics for my weather station during the month of September

 

Mean Maximum: 18.2C

Mean Minimum: 10.1C

Overall Mean: 14.15C

 

Monthly Rainfall total: 55.6mm

Rainfall days: 7 days

Max rainfall in one day: 22.7mm (2nd September)

Total Snowfall: 0cm

Snowfall Days (snow falling): 0cm

Max snowfall in one day: 0cm

 

 

Highest daily maximum temperature: 22.6C (13th September)

Lowest daily maximum temperature: 13.1C (2nd September) 

Highest daily minimum temperature: 12.7C (3rd September)

Lowest daily minimum temperature: 7.5C (26th September)

 

Days with Ground Frost: 0 

Days with Air Frost: 0

Days of falling snow: 0

Days of lying snow: 0

Thunder days: 0

 

Temperature frequency breakdown

 

Maximum temperature:

10.0C to 14.9C: 1 day

15.0C to 19.9C: 23 days

20.0C to 24.9C: 6 days

 

Minimum temperature:

5.0C to 9.9C: 13 days

10.0C to 14.9C: 17 days

 

Compared to the Colwyn Bay September average (81-10 average = 14.05), my average comes in at +0.1C above the Colwyn Bay average, making it an average month

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