2009 Weather

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2009 Summary


2009 produced the 7th highest annual mean temperature 10.4C in 54 years records. 

March to November were milder (except for mostly cool July) and Jan, Feb and Dec colder than usual. 

Monthly mean temperatures ranked April 3rd highest, Sept 6th highest, 
May and Oct 8th highest, June 10th highest on record. 

The first two days of cool July were very warm and produced the highest min temp 21.5C on record. 
January produced the 16th coldest night -8.1C, while November's low min 1.7C was the highest on record here. December had the 10th lowest mean temp.

14.1 mean max (C)    +0.3 diff from av (C)
6.8 mean min (C)    +0.4 diff from av (C)
10.4 mean (C)   +0.3 diff from av (C)

29.3 high max (C) on 2 July 
0.2 low max (C) on 2 Feb 
21.5 high min (C) on 2 July 
-8.1 low min (C) on 6 Jan 


Annual rainfall was the 17th highest in 54 years, with July being the 2nd wettest (but not as high as 2007), 
March the 8th driest and September the 6th driest month on record.

Aggregated rainfall Jan to July was 488mm, the 9th highest on record, 
slightly below 2008 but well below 2007's 708mm for the 7 months.

821.5 rain total (mm)   105.4 % of av 
180 raindays (no. of days with 0.2mm or more)
141 wetdays (no. of days with 1.0mm or more)
27.9 most in a day (mm)
6 Jun date


January 2009 February 2009 March 2009

After a very cold and frosty start to the month, temperatures rose to normal levels after 11th, and overall the mean was 1.1 deg below normal.

While the month began almost dry, rain fell every day between 11th and 22nd, and the month's total rainfall was normal.

January brought the 16th coldest night here (-8.1 deg) in the last 53 years, the previous coldest being -9.9 deg in Jan 2002.

There have only been 3 years in the last 53 with a lower High Max temperature (in 1963, 1978 and 1979).   Both Mean and Highest Min temperatures rank 13th lowest in the last 53 years.  The most recent year with a lower January mean temperature was 1997 (with 2.1 deg).

Recent years with more January snow days were 2002 (with 5 days), 1997 (with 6) and 1996 (with 7). However snow amounts were quite modest, just 2.5cm falling overnight on the 5th, and only very light snowfall on 2nd and 6th.

5.6 mean max (C) 
-0.8 diff from av (C)
0.0 mean min (C) 
-1.4 diff from av (C)
2.8 mean (C)
-1.1 diff from av (C)
9.1 high max (C) on 12th 
0.4 low max (C) on 4th 
5.5 high min (C) on 12th 
-8.1 low min (C) on 6th 

73.5 rain total (mm),   99 % of normal 
18 raindays (days with >=0.2mm)
12 wetdays (days with >=1.0mm)
10.4 most in a day (mm) on 17th

7 days with air frost 
3 days with snow fall on 2nd, 5th and 6th
3 days with snow lying at 0900, on 5th, 6th and 8th 

3 days with fog, on 1st, 14th and 27th

A cold and snowy start to the month, with 7 snow days up to 10th (last exceeded in 1996), and having the lowest max temp of 0.2C on 2nd (the lowest since 1996).

A total of 16.5 cm of new snow was recorded in the month, only exceeded in 8 of the last
53 years here, although 26cm fell in 1991 and 27mm in 1996.

Total precipitation only 70% of normal almost all of this falling before 13th.

A dry and pleasantly mild second half of the month with max temps between 9C and 12C.

Statistically, temps for the month were "normal", although this hides the two distinctly
different halves of this February.

7.0 mean max (C) 
0.0 diff from av (C)
1.5 mean min (C) 
0.1 diff from av (C)
4.3 mean (C)
0.1 diff from av (C)
12.1 high max (C) on 21,27 
0.2 low max (C) on 2 
7.2 high min (C) on 23 
-4.7 low min (C) on 12 

36.0 rain total (mm)
70% of av 
11 raindays (with >=0.2mm)
9 wetdays (with >=1.0mm)
17.7 most in a day (mm) on 9 

12 days with air frost (air min temp < -0.1C)

7 days sleet/snow falling on 2,4,5,6,7,8,10
6 days with 50% snow cover at 0900, on 2,3,4,5,6,7

A dry month having the 8th lowest March rainfall in last 53 years.
Half this (12.3mm) fell on 3rd. 
No rain fell between 14th and 22nd.

A bright month with 23 days having useful sunshine.
After a cool start, the month was mild after 11th, making the monthly mean temperature nearly a degree higher than normal. 

The mean temperature was the 12th highest in 53 years, although recently exceeded in 2007, 2002 and 2000). 

6 mornings had airfrost, 2nd, 4th-6th, 11th and 29th.

11.4 mean max (C) 
+1.5 diff from av (C)
3.2 mean min (C) 
+0.1 diff from av (C)
7.3 mean (C)
+0.8 diff from av (C)
15.2 high max (C) on 16th 
7.4 low max (C) on 8th 
7.6 high min (C) on 12th 
-2.8 low min (C) on 6th 

25.7 rain total (mm)
41.9 % of av 
12 raindays (days with >=0.2mm)
8 wetdays (days with >=1.0mm)
12.3 most in a day (mm) on 3rd 

6 days with air frost (air min temp <=-0.1C)
2 days with fog 

April 2009 May 2009 June 2009

A changeable month with slightly above average rainfall. 
Wet periods 6th-10th (16mm), 14th-16th (14mm) and 26th-30th (31mm). 
Thunder for 30 mins on 15th and briefly on 28th.
A mild month, having the 3rd highest mean temp in last 53 years, 
and 4th highest low min temp resulting in no recorded air frosts.

14.9 mean max (C) 
+1.5 diff from av (C)
5.6 mean min (C) 
+1.3 diff from av (C)
10.3 mean (C)
+1.4 diff from av (C)
19.6 high max (C) on 20th 
9.6 low max (C) on 16th 
9.3 high min (C) on 10th 
0.4 low min (C) on 5th 

66.1 rain total (mm)
110 % of av 
14 raindays (with >=0.2mm)
12 wetdays (with >=1.0mm)
11.0 most in a day (mm) on 26th 

0 days with air frost (air min temp <=-0.1C)

2 days when thunder heard 
15th 0745 to 0815
28th 1930 

2 days with fog 3rd and 17th

A changeable month with normal rainfall, most falling between 14th and 19th.
Minimum temps were slightly higher than normal, and maxima slightly lower, making mean around normal for May. 
Cool on 4th, and 13th-14th, but a warm finish to the month from 23rd to 31st. The highest temp recorded was 25.6C on 29th, equal 8th highest in last 53 years here. 
Very heavy showers occurred nearby on the afternoon of 20th, although little rainfall recorded at the station location.

17.2 mean max (C) 
-0.2 diff from av (C)
7.9 mean min (C) 
+0.5 diff from av (C)
12.6 mean (C)
+0.2 diff from av (C)
25.6 high max (C) on 29th 
12.1 low max (C) on 4th 
11.2 high min (C) on 10th 
3.9 low min (C) on 4th 

56.2 rain total (mm)
99 % of av 
12 raindays (days with >=0.2mm)
10 wetdays (days with >=1.0mm)
15.9 most in a day (mm) on 14th

1 day with thunder heard on 15th at 1440 and 1620 

A very warm end to June reaching 28.8C on 29th with the third highest min of 17.7C on morning of 30th, making the mean for the month the 10th highest in 54 years here. 
Rainfall totalled 99.0mm, the ninth wettest June in 54 years, mostly falling during the second week of the month,followed by two very dry weeks, bad news for my fruit and vegetables. 
A 2 hour thunderstorm with spells of heavy rain on 29th added a welcome 21.4mm to the total. 
Thundery also on 10th, with 13mm of rain falling in an hour and a half, and 27th with only light rain. 
Overall, some pleasant sunny days but becoming uncomfortably hot and humid in the final few days of the month.

20.6 mean max (C) 
+0.4 diff from av (C)
10.7 mean min (C) 
+0.4 diff from av (C)
15.7 mean (C)
+0.4 diff from av (C)
28.8 high max (C) on 29th 
10.1 low max (C) on 6th 
17.7 high min (C) on 30th 
3.9 low min (C) on 12th 

99.0 rain total (mm)
160 % of av 
14 raindays (days with >=0.2mm)
10 wetdays (days with >=1.0mm)
21.4 most in a day (mm) on 29th

1 days with fog at morning observation hour

3 days thunder heard :
10th from 1530-1600 
27th at 1700 
29th from 1645-1830 

July 2009 August 2009 September 2009

Generally a disappointing and quite un-summery month. 
Although starting well, it turned into a cool and very wet July, the second wettest in the last 54 years, just exceeding 1988 and 1957 although far short of 2007. 
Aggregated rainfall for Jan-July of 488mm ranks 9th, slightly below 2008 but well below 2007's 708mm at this point of the year. 
21.4mm of rain on 29th from lunchtime onwards led to much surface water lying, and 18.3mm heavy rain fell during the later half of 19th. Over 10mm fell on each of 11th, 16th and 26th. 
Although maximum temperatures were depressed, this July still managed to rank the 15th highest max and the 17th highest mean temperature at the start of the month before they started to drop down to their unseasonably low values.

20.8 mean max (C) 
-1.5 diff from av (C)
12.7 mean min (C) 
+0.1 diff from av (C)
16.8 mean (C)
-0.7 diff from av (C)
29.3 high max (C) on 2nd 
15.6 low max (C) on 29th 
21.5 high min (C) on 2nd 
7.9 low min (C) on 10th

131.0 rain total (mm)
261% of av 
22 raindays (days with >=0.2mm)
20 wetdays (days with >=1.0mm)
21.4 most in a day (mm) on 29th

Some brighter days but disappointing for August with many days remaining stubbornly cloudy for much of the time.
Mean temperature was 0.3C above normal (11th highest August mean in 54 years).
The mean min was 0.9C higher than normal while mean max 0.2C lower than normal. 
A cool night on 29th, min temp 8.5C, but only 5.0C on my more exposed allotment site 2.5 miles away. 
Quite a dry month (17th driest August), although interestingly the cumulative rainfall Jan to Aug now totals 534.2mm (the 18th wettest cumulatively) because of the higher rainfall in some earlier months. 
Not the best end to summer weatherwise.

21.0 mean max (C) 
-0.2 diff from av (C)
13.0 mean min (C) 
+0.9 diff from av (C)
17.0 mean (C)
+0.3 diff from av (C)
26.4 high max (C) on 19th 
16.6 low max (C) on 1st 
16.7 high min (C) on 20th 
8.5 low min (C) on 29th 

46.5 rain total (mm)
68 % of av 
14 raindays (with >=0.2mm)
10 wetdays (with >=1.0mm)
8.0 most in a day (mm) on 1st


A mild and very dry month, staring with thunder and rain as ex-hurricane Danny passed over, then settling down to an uneventful mixture of dull days and a few more cheerful sunny days. 

This month achieved the 6th highest September mean temperature (in 53 years of records), and the 3rd mildest night. This was the 6th driest September, about the same as 2002, while the most recent year with less rain in September was 1996. What a contrast to Sept 2008 with 123mm ! 

Pressure remained high, having the 8th highest mean pressure, and the 2nd highest max pressure for the month just exceeding 1986). The steady pressure drop between 0900 on 2nd and 0230 on 3rd was of interest, falling
by 19mb in 17 hours, with rainfall starting 1600 on 2nd until 0600 on 3rd.

18.8 mean max (C) 
+1.4 diff from av (C)
10.6 mean min (C) 
+0.6 diff from av (C)
14.7 mean (C)
+1.0 diff from av (C)
23.1 high max (C) on 8th 
14.9 low max (C) on 17th 
16.2 high min (C) on 8th 
6.2 low min (C) on 10th 

16.5 rain total (mm)
23% of av 
4 raindays (with >=0.2mm)
2 wetdays (with >=1.0mm)
13.5 most in a day (mm) on 2nd

thunder heard on 1st at 1415
fog on morning of 30th

October 2009 November 2009 December 2009

A mild October having the 8th highest mean temp in last 53 years. Highest max temp on was 18.9C 6th, with lowest max of 11.0C the next day on 7th. Mean temps were about 4deg C above expected from 22nd to 31st, so exceptionally mild end to the month.
Rainfall about normal, most falling on 6th, 31st, less on 15th and between 20th and 26th, leaving some useful dry days.
Just two ground frosts on 8th, with min tem 2.5C, and 13th with min 2.7C, and one foggy morning on 15th.
Generally a pleasant October with some good cheerful sunny spells to show off the autumn foliage.

15.0 mean max (C) 
+1.3 diff from av (C)
8.6 mean min (C) 
+1.4 diff from av (C)
11.8 mean (C)
+1.3 diff from av (C)
18.9 high max (C) on 6th 
11.0 low max (C) on 7th 
12.6 high min (C) on 31st 
2.5 low min (C) on 8th 

77.9 rain total (mm)
107.3 % of av 
16 raindays (with 0.2mm or more)
12 wetdays (with 1.0mm or more)
20.8 most in a day (mm) on 31st

2 ground frosts on 8th and 13th.
1 foggy morning on 15th.

Cooler around the 9th and from 27th, but otherwise pleasant and untypically mild.

The mean temp 8.4C was the 2nd highest recorded for November in the last 53 years, beaten only in 1994. The low min 1.7C was notably the highest on record, although the high min only the 10th highest. The max temp has been 1.2C above normal, and the min temps 2.4C above normal so nights have been less cold than usual. Indeed the only brief ground frost seen was in the early hours of 9th, although it had cleared by 0900.

A wet month, with rainfall the 4th highest on record, just exceeding that of 2008.
The 26 rain days were only exceeded in 2002, and the 21 wet days were only exceeded in 1960, so soil has remained very wet, and humidity high. 

Several windy days 18th - 20th. Notably mean pressure 997.7mb was 3rd lowest recorded, beaten only by 997.1mb in 1963.

10.4 mean max (C) 
+1.2 diff from av (C)
6.3 mean min (C) 
+2.4 diff from av (C)
8.4 mean (C)
+1.8 diff from av (C)
14.3 high max on 20th 
4.9 low max on 30th 
11.5 high min on 20th 
1.7 low min on 9th 

129.2 rain total (mm)
183 % of av 
26 raindays (days with >=0.2mm)
21 wetdays (days with >=1.0mm)
20.8 most in a day (mm) on 12th

1 ground frost on 9th

1 day with fog on 11th


A cold month overall having the 10th lowest December mean temperature here in the last 54 years, the coldest since 1996.

Although mild from 5th to 10th, mean temperatures were well below normal for the rest of the month,
especially between 18th and 24th.

Air frost occurred on 10 nights, and ground frost was observed on a further 6 nights.

Precipitation was 79% of normal, half of this falling before 10th.

Snow totalling 2.5cm fell on 3 days, but our locality was spared the problems experienced elsewhere, even though there were significant falls not too far away. Snowfall on 19th did not thaw until 26th.
It made a change having lying snow on Christmas Day, not seen since 1981.

5.3 mean max (C) 
-1.6 diff from av (C)
0.7 mean min (C) 
-2.0 diff from av (C)
3.0 mean (C)
-1.8 diff from av (C)
11.6 high max (C) on 5th 
0.9 low max (C) on 18th 
7.7 high min (C) on 6th 
-6.4 low min (C) on 19th 

63.7 rain total (mm)
79% of av 
17 raindays (with >=0.2mm)
16 wetdays (with >=1.0mm)
11.7 most in a day (mm) on 29th

10 air frost (air min temp -0.1C or less)
on 1st, 18th to 24th, 28th to 29th

3 days with snow falling 
19th, 23rd and 29th, totalling 2.5cm

6 days with 50% snow cover at 0900
20th to 25th 

1 day with fog at 0900, on 11th

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