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JULY 2007 daily and monthly summary

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JULY 2007
August 2007

1st - 5th
Continuing unsettled with a little sunshine and showers. Thunderstorm late afternoon/evening 3rd.
6th - 14th
Becoming rather brighter with very weak ridging from the Azores high although long sunny spells still few and far between. Some showers and thunderstorms in the SE but mostly missing this area.
15th - 19th
Thunderstorm early morning of 15th but a warm and humid day follows. Sunshine and showers over the next few days, while extreme heat affects much of continental Europe.
20th - 23rd
LP develops over northern France and swings across the Channel. Heavy bursts of rain from 01.00 to noon with thunder in mid-morning give way to a fine afternoon. This system leaves Kent relatively unscathed but causes flash flooding around London, the Thames and Severn Valleys with some parts of the country receiving over 100mm rainfall in less than 24 hrs. More heavy showers on the 21st and moderate rain for several hours early morning of 23rd.
24th - 31st
Rather mediocre with predominantly cloudy skies and showers. More general overnight rain on 27th/28th and as a LP tracks across S England overnight 28th/29th. A fine end to the month however with long sunny periods on 30th and 31st.

 JULY 2007 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 20.8
ºc 
 ( -1.9C )*
 Average Minimum 13.0
ºc 
 ( -0.2C )*
 Monthly Mean 16.4
ºc 
 
 Highest Maximum 25.6
ºc 
 (15th)
 Lowest Minimum 9.9
ºc 
 (30th/31st)
 Days Max >= 25º 1
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill 9.9
ºc 
 (30th/31st)
 Low Heat Index (THW) 9.9
ºc 
 (30th/31st)
 High Heat Index (THW) 26.3
ºc 
 (15th)
 High Sun Index (THSW) 32.5
ºc 
 (15th)
    
 
 RAINFALL
 Monthly Total 87.4
 mm
( 207% )*
 Rainy Days (=>0.2mm) 17
( +3 )*
 Inc days =>1mm) 14
 
 Dry Days 14
( -3 )*
 Highest Daily Total 22.1
 mm
 (20th)
 Highest Rain Rate 103.1
 mm/hr
 (17th)
   
 EVAPO-TRANSPIRATION
 Highest Daily 4.4
 mm (7th)
 Monthly Total 90.4
 mm
 WIND
 Monthly Average 2.5  mph  
 Highest Gust 29  mph (6th)
 Dominant Directions SSW  (64%)
W  (  7%)
NNW  (  5%)
N  (  5%)
     
 SUNSHINE†
 Sunniest Day
9.0
 hrs (7th)
 Monthly Sunshine
136.2
 Hours
 Peak Solar Rad.
1266
 w/m² (6th)
 Total Solar Energy
11417
 Langleys
 
   
 DEWPOINT
 Average at 14.00h 11.1 ºc
 Highest Reading 18.4 ºc   (15th)
 Lowest Reading 4.3 ºc   (  8th)
 RELATIVE HUMIDITY
 Average at 14.00h 59 %
 Lowest Reading 34 % (31st)
 Monthly Average 72 %
 BAROMETER
 Monthly Mean 1010.7  hPa  
 Highest Reading 1020.7  hPa (31st)
 Lowest Reading 994.2  hPa (23rd)
‡ 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 JULY 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
14.3 18.6 70 11.9 3.2 1002.6 st 2.8 4.3 24 SSW
2nd
13.8 19.6 66 12.1 1.8 1002.1 st 1.0 4.4 25 SSW
3rd
12.5 19.4 61 9.9 3.3 997.8 fs 11.7 2.7 16 SSW
4th
11.2 19.4 63 10.8 5.8 1006.0 fs 1.3 3.6 20 SSW
5th
13.8 18.7 58 9.6 1.0 1012.2 fs 1.8 3.7 24 SSW
6th
13.3 20.0 49 8.7 5.7 1009.8 rs 0.0 4.9 29 SSW
7th
11.4 21.8 37 6.2 9.0 1015.4 st 0.0 2.7 19 SSW
8th
10.1 21.6 46 7.5 5.7 1015.5 fs 0.0 1.4 17 SSW
9th
11.4 19.9 69 10.4 4.5 1012.3 st 0.0 1.6 14 SSW
10th
11.4 19.6 54 9.4 4.7 1011.4 rs 0.0 0.4 7 SSW
11th
12.8 21.1 59 10.3 2.8 1013.8 st 0.0 0.7 11 SSW
12th
13.1 21.4 73 15.8 1.2 1013.0 st 0.0 2.2 16 SSW
13th
15.9 24.1 62 14.8 4.8 1011.1 fs 0.0 2.4 19 SSW
14th
16.4 22.4 54 12.4 6.8 1012.9 rs 0.0 3.8 19 SSW
15th
14.4 25.6 65 17.6 4.8 1008.4 fs 4.1 0.5 10 ESE
16th
17.2 22.8 65 14.0 3.0 1009.4 st 0.8 1.9 12 SSW
17th
14.4 19.7 79 14.2 4.5 1013.0 st 4.6 4.3 24 SSW
18th
13.4 22.0 55 11.8 6.7 1017.2 rs 0.0 2.8 19 SSW
19th
11.1 24.1 46 10.8 5.3 1016.9 fs 0.0 0.2 8 ESE
20th
14.8 19.7 70 13.8 2.7 1010.2 r 22.1 2.3 23 SSW
21st
12.3 19.1 64 11.2 5.2 1012.2 fs 5.1 2.9 17 SSW
22nd
12.3 20.6 50 9.0 7.3 1009.6 fs 0.5 1.6 13 SSW
23rd
13.2 19.4 79 13.6 0.5 995.5 f 13.5 0.8 14 ESE
24th
12.8 21.9 45 9.1 6.3 1009.8 rs 0.0 2.2 16 NNW
25th
13.2 19.4 71 12.3 2.2 1012.1 fs 0.3 3.6 24 SSW
26th
14.5 18.4 69 12.4 1.0 1003.9 f 1.8 5.5 28 SSW
27th
13.9 21.1 55 10.9 6.2 1011.6 st 5.6 4.3 22 SSW
28th
12.4 21.4 55 11.0 4.0 1015.2 rs 2.5 2.0 18 SSW
29th
11.3 20.1 54 8.4 3.0 1015.1 st 8.1 1.7 16 N
30th
9.9 20.2 43 6.4 5.0 1020.2 st 0.0 1.1 14 N
31st
9.9 22.4 38 6.8 8.2 1019.0 fs 0.0 0.5 10 SE
                     
‡ 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