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AUGUST 2007 daily and monthly summary

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AUGUST 2007
September 2007

1st - 7th
Ridging HP to the S and ex Tropical Storm Chantal to NNW allows importing of warm tropical maritime flow with plenty of sunshine. Unbroken sunshine on the 4th and most of 5th. Thundery showers evening of 7th.
8th - 13th
The ridge of HP starts to decline away to the SW although the weather remains dry and bright. Rather more cloud than during the week before.
14th - 23rd
A complex LP approaches the UK on the 14th from the W, bringing drizzle and very humid maritime air from mid-morning and heavier rain during the evening. An unsettled and windy period: rain early morning of 15th and moderate showers afternoon of 16th. Less windy but dull on 17th with rain during evening, and 18th with rain in the morning. Continuing cloudy or overcast and very dull in the SE with outbreaks of rain as the LP moves away very slowly though the rest of the country enjoyes a fine and warm spell.
24th - 31st
HP finally extends its influence over the east of the UK giving warm weather with long sunny periods from the 25th to the 27th. Increasing cloud from the 28th onwards.

 AUGUST 2007 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 21.2
ºc 
 ( -1.3C )*
 Average Minimum 12.3
ºc 
 ( -0.6C )*
 Monthly Mean 16.3
ºc 
 
 Highest Maximum 28.9
ºc 
 (  5th)
 Lowest Minimum 9.2
ºc 
 (17th)
 Days Max <20 ºC 12
 
 Days Max >25 ºC 4
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill 9.2
ºc 
 (17th)
 Low Heat Index (THW) 9.2
ºc 
 (17th)
 High Heat Index (THW) 28.7
ºc 
 (  5th)
 High Sun Index (THSW) 34.9
ºc 
 (  5th)
    
 
 RAINFALL
 Monthly Total 43.6
 mm
 ( 84% )*
 Rainy Days (=>0.2mm) 11
 ( ±0 )*
 Inc days =>1mm) 8
 
 Dry Days 20
 ( ±0 )*
 Highest Daily Total 16.8
 mm
 (14th)
 Highest Rain Rate 22.6
 mm/hr
 (  7th)
 Days with Thunder 1
 
   
 EVAPO-TRANSPIRATION
 Highest Daily 4.2
 mm (5th)
 Monthly Total 73.4
 mm
 WIND
 Monthly Average 1.7  mph  
 Highest Gust 28  mph (15th)
 Dominant Directions SSW  (34%)
N  (20%)
NNW  (19%)
W  (  5%)
   
     
 SUNSHINE†
 Sunniest Day 10.0  hrs ( 4th)
 Monthly Sunshine 131.9  Hours
 Peak Solar Rad. 1072  w/m² (27th)
 Total Solar Energy 9292  Langleys
 
   
 DEWPOINT
 Average at 14.00h 11.1 ºc
 Highest Reading 16.9  (14th)
 Lowest Reading 3.7  (  8th)
 RELATIVE HUMIDITY
 Average at 14.00h 58 %
 Lowest Reading 30 % (10th)
 Monthly Average 72 %
 BAROMETER
 Monthly Mean 1014.7  hPa  
 Highest Reading 1028.7  hPa  (26th)
 Lowest Reading 995.0  hPa  (14th)
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine is limited. The sensor receives only 75% of total possible sunshine exposure this month. 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.
THW = Shaded Heat Index calculated with cooling/warming effect of wind and humidity to give an apparent temperature.
THSW = Unshaded Heat Index calculated with cooling/warming effect of wind, humidity and full direct sunshine to give an apparent temperature.
EVAPO-TRANSPIRATION is drying effect due to sun and wind, and is equivalent to "negative rainfall"

   DAILY STATS AUGUST 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
9.8 25.1 40 10.0 6.7 1012.1 f 0.0 0.3 8 ESE
2nd
14.3 21.8 54 10.8 3.5 1012.6 rs 0.0 0.8 11 SSW
3rd
11.1 23.7 46 11.2 7.8 1021.6 st 0.0 1.6 14 SSW
4th
13.2 25.1 47 12.8 10.0 1020.0 f 0.0 2.1 16 SSW
5th
12.8 28.9 39 13.1 9.5 1008.3 f 0.0 1.2 14 SSW
6th
15.4 23.4 39 8.3 7.2 1009.7 rs 0.0 1.8 17 SSW
7th
10.3 24.7 38 8.6 5.2 1014.8 st 6.3 0.6 8 SSW
8th
11.8 21.4 39 6.1 5.8 1018.4 st 0.3 1.1 12 NNW
9th
11.1 22.0 40 7.2 6.7 1018.9 fs 0.0 1.2 16 NNW
10th
10.1 24.9 35 7.2 8.8 1017.4 fs 0.0 0.8 12 N
11th
11.1 24.2 52 12.3 5.5 1013.4 f 0.0 0.5 12 SSW
12th
10.2 21.9 67 13.4 4.2 1007.4 fs 0.0 1.9 19 SSW
13th
9.7 20.8 60 10.7 4.8 1009.8 st 0.0 2.4 19 SSW
14th
14.3 18.6 89 14.8 0.2 998.7 f 16.8 3.5 26 SSW
15th
15.8 20.6 63 12.9 3.8 996.8 st 3.3 5.8 28 SSW
16th
11.7 19.7 66 9.4 3.8 1010.8 rs 3.8 1.7 16 SSW
17th
9.2 19.0 54 8.0 2.7 1016.5 st 0.0 1.5 13 SSW
18th
14.1 19.3 64 11.8 0.5 1009.5 f 3.6 2.8 18 SSW
19th
15.1 17.4 77 12.7 0.3 1005.1 st 4.8 0.9 11 W
20th
12.0 15.6 77 11.0 0.3 1004.5 st 0.8 1.3 12 N
21st
12.4 18.4 78 13.8 0.3 1012.5 r 0.3 3.9 19 NNW
22nd
15.0 16.1 83 12.5 0.0 1012.4 st 1.8 6.3 26 N
23rd
13.8 15.6 86 12.7 0.0 1015.4 rs 1.8 3.1 19 NNW
24th
14.8 19.8 75 14.3 0.7 1024.5 rs 0.0 0.7 8 N
25th
11.1 25.5 55 15.0 9.8 1027.4 fs 0.0 0.6 10 SSW
26th
14.1 23.7 50 11.7 6.7 1028.0 fs 0.0 0.5 10 N
27th
12.0 20.8 44 7.4 7.7 1023.4 f 0.0 0.9 12 N
28th
11.4 21.3 46 8.7 4.8 1020.4 fs 0.0 0.3 10 N
29th
11.9 21.2 49 9.8 3.2 1019.2 fs 0.0 0.3 8 N
30th
10.3 18.7 70 12.6 0.1 1021.0 st 0.0 0.7 10 SSW
31st
11.7 19.3 66 11.8 1.3 1020.4 fs 0.0 1.1 10 SSW
                     
‡ 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