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MAY 2007 daily and monthly summary

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MAY 2007
June 2007


1st - 6th
HP to the east and LP over Iberia maintains an easterly flow. A bank of stratus moves over the UK from the North Sea leading to cloudier conditions from the 3rd.
7th - 17th
The pattern changes as LPs from the Atlantic break through the HP blocking. 'Wave' front brings overnight rain and some showers in the afternoon of the 7th. Becoming rather windy and mostly dull, with rain mostly falling from late afternoon and at night. The 11th was a fine day but the 13th was rainy from mid morning, brightening only late afternoon. Continuing dull with outbreaks of mostly light rain.
18th - 25th
Although LP remains never far away, conditions turn more settled and much brighter with the exception of the 21st which was a very dull day. From the 22nd to 24th the southern UK lies in a col with HP to east and west, LP to north and south.
26th - 31st
Conditions deteriorate as LP tracks through the English Channel and into France, the Bank Holiday weekend of the 27th and 28th being particularly awful for the time of year with 48 hours of broken, but long spells of rain. The daytime maximum for the 28th was the lowest recorded for any date in May at this site. Remaining unsettled with showers.


 MAY 2007 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 17.3
ºc 
 ( -0.1 ) *
 Average Minimum 9.0
ºc 
 ( +0.7 ) *
 Monthly Mean 12.8
ºc 
 
 Highest Maximum 25.5
ºc 
 (24th)
 Lowest Minimum 4.1
ºc 
 (15th)
 Days Max => 20 ºC 5
 
 ...inc Days Max => 25 ºC 2
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill 4.1
ºc 
 (15th)
 Low Heat Index (THW) 3.9
ºc 
 (15th)
 High Heat Index (THW) 25.3
ºc 
 (24th)
 High Sun Index (THSW) 33.4
ºc 
 (23rd)
    
 
 RAINFALL
 Monthly Total 61.4
 mm
( 135%) *
 Rainy Days (=>0.2mm) 15
( +4 ) *
 Inc days =>1mm) 14
 
 Dry Days 16
( -4 ) *
 Highest Daily Total 13.2
 mm
 (28th)
 Highest Rain Rate 24.4
 mm/hr
 (12th)
 Days with Thunder 0
 
   
 EVAPO-TRANSPIRATION
 Highest Daily 4.1
 mm (22nd)
 Monthly Total 74.0
 mm
 WIND
 Monthly Average 2.1  mph  
 Highest Gust 29  mph (8th)
 Dominant Directions SSW  (43%)
NNW  (14%)
N  (13%)
W  (  5%)
   
     
 SUNSHINE†
 Sunniest Day 10.0  hrs ( 2nd)
 Monthly Sunshine 119.0  Hours
 Peak Solar Rad. 1244  w/m² (11th)
 Total Solar Energy 10062  Langleys
 
   
 DEWPOINT
 Average at 14.00h 8.1 ºc
 Highest Reading 14.5  (25th)
 Lowest Reading -0.6  ( 2nd)
 RELATIVE HUMIDITY
 Average at 14.00h 62 %
 Lowest Reading 27 % (2nd)
 Monthly Average 73 %
 BAROMETER
 Monthly Mean 1010.1  hPa  
 Highest Reading 1023.0  hPa  (23rd)
 Lowest Reading 993.5  hPa  (11/27th)

   DAILY STATS MAY 2007
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
DATE
Minimum
(21-09h)
Maximum
(09-21h)
RH %
at 14.00
Dewpoint ºc
at 14.00
Bright
sun hrs
hPa   †
at 14.00
Day Total
(mm)
Average
(mph)
High Gust
(mph)
Dominant
(Compass)
                   
1st
8.6 21.7 35 5.3 9.9 1012.3 st 0.0 0.9 13 ENE
2nd
8.7 19.9 29 1.1 10.0 1013.7 st 0.0 1.4 16 ENE
3rd
7.5 16.2 55 6.3 5.3 1015.9 fs 0.0 1.8 13 NNW
4th
7.7 17.3 54 7.5 6.3 1014.0 st 0.0 1.9 14 N
5th
8.6 15.6 59 5.3 3.0 1019.2 st 0.0 1.1 13 NNW
6th
4.2 17.7 63 10.5 3.3 1015.0 fs 0.0 3.0 20 SSW
7th
12.8 17.2 73 11.7 2.5 1007.4 fs 2.3 5.3 27 SSW
8th
9.7 19.1 33 2.3 4.5 1009.6 st 0.0 4.3 29 SSW
9th
9.4 13.9 81 10.5 0.1 1012.6 fs 2.3 3.1 27 SSW
10th
10.1 15.8 66 7.0 2.2 1005.6 fs 4.6 5.2 26 SSW
11th
8.1 16.3 75 8.1 3.2 1005.7 st 5.1 4.7 22 SSW
12th
9.2 16.6 61 8.7 6.3 1005.2 rs 4.8 5.4 27 SSW
13th
10.4 14.2 88 11.0 0.9 996.6 f 5.1 1.5 20 SSW
14th
10.6 12.9 83 7.3 0.1 1006.3 r 2.0 2.5 19 SSW
15th
4.1 13.7 83 9.1 0.8 1011.4 f 1.5 2.0 17 SSW
16th
10.1 16.8 54 6.6 2.0 1012.2 st 2.0 1.3 13 SSW
17th
11.9 17.4 77 12.7 0.5 1013.7 r 1.5 0.8 12 NNW
18th
10.4 18.8 67 10.6 5.8 1010.5 fs 0.0 3.7 26 SSW
19th
9.0 16.5 50 5.7 6.1 1011.9 st 0.0 3.8 21 SSW
20th
5.7 19.0 52 8.1 4.5 1014.1 st 0.0 0.3 10 NNW
21st
9.4 13.3 87 10.8 0.0 1016.0 st 2.5 0.2 7 NNW
22nd
11.4 23.1 37 6.1 9.2 1020.7 st 0.0 0.7 13 N
23rd
8.6 25.0 41 10.8 6.7 1020.7 fs 0.0 0.3 12 SSW
24th
10.6 25.5 48 12.5 6.0 1014.2 f 0.0 0.2 11 SSW
25th
14.4 23.6 57 14.2 3.3 1005.9 f 0.0 0.5 14 SSW
26th
12.3 16.9 54 7.2 1.0 1003.8 f 0.0 0.2 8 N
27th
10.1 12.8 79 7.7 0.0 994.9 fs 11.4 0.3 10 ESE
28th
7.2 7.7 88 5.1 0.0 1003.7 r 13.2 4.0 22 N
29th
4.7 15.7 41 1.6 6.7 1009.1 st 0.3 1.8 16 SSW
30th
5.9 15.3 89 12.2 1.8 1002.1 fs 2.8 2.1 18 SSW
31st
7.7 19.4 52 8.6 7.0 1008.0 st 0.0 1.2 14 ESE
                     
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is rather limited. The sensor receives approx 75% of total possible sunshine exposure this month, and there is no allowance for sunshine by visual observation only, so the figures above can be very significantly less than the actual daily sunshine duration.
† Barometer trend (previous 3 hours) : f = falling, st = steady, r = rising; q = quickly, s = slowly