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SEPTEMBER 2007 daily and monthly summary

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SEPTEMBER 2007
October 2007

1st - 7th
The month begins with HP to the WSW and a ridge extending eastwards, bringing fine and dry but often cloudy conditions. Light showers early morning of the 3rd., then continuing mostly bright with sunny periods with a brief warmer spell as more humid air arrives.
8th - 14th
More of the same as the UK remains largely under the influence of the mid Atlantic HP. Calm and dry with variable amounts of cloud and sunshine. Cold front sweeps down from the NW on the 14th but with no rainfall and making no difference to the weather conditions.
15th - 22nd
Situation over the UK changes subtly, but a weak ridge of HP to the S means periods of heavy rain in the NW from fronts continue to die out before reaching the SE corner, giving just short periods of light rain or showers from the 17th to 20th.
23rd - 30th
Passage of LP brings a northerly airsteam from the arctic seas and a drop in temperature. Cold front and trough on the 23rd brings some heavy rain in the early hours and mid-morning. More rain during the middle of the day on 28th and overnight on 29th.

 SEPTEMBER 2007 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 19.3
ºc 
 ( +0.2C )*
 Average Minimum 10.8
ºc 
 ( +0.3C)*
 Monthly Mean 14.6
ºc 
 
 Highest Maximum 24.2
ºc 
 (  6th)
 Lowest Minimum 6.3
ºc 
 (30th)
 Days Max <20 ºC 15
 
 Days Max >25 ºC 0
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill 5.7
ºc 
 (25th)
 Low Heat Index (THW) 5.7
ºc 
 (25th)
 High Heat Index (THW) 24.5
ºc 
 (  6th)
 High Sun Index (THSW) 30.2
ºc 
 (  6th)
    
 
 RAINFALL
 Monthly Total 22.2
 mm
( 39% )*
 Rainy Days (=>0.2mm) 10
( -1 )*
 Inc days =>1mm) 3
 
 Dry Days 20
( +1 )*
 Highest Daily Total 11.4
 mm
 (24th)
 Highest Rain Rate 18.5
 mm/hr
 (24th)
 Days with Thunder 0
 
   
 EVAPO-TRANSPIRATION
 Highest Daily 2.7
 mm (11th)
 Monthly Total 57.3
 mm
 WIND
 Monthly Average 1.9  mph  
 Highest Gust 24  mph (24th)
 Dominant Directions SSW  (25%)
N  (25%)
SW  (14%)
NNW  (13%)
   
     
 SUNSHINE†
 Sunniest Day 8.3  hrs (11th)
 Monthly Sunshine 116.2  Hours
 Peak Solar Rad. 1065  w/m² (  5th)
 Total Solar Energy 7246  Langleys
 
   
 DEWPOINT
 Average at 14.00h 9.5 ºc
 Highest Reading 15.6  (  9th)
 Lowest Reading -0.5  (18th)
 RELATIVE HUMIDITY
 Average at 14.00h 57 %
 Lowest Reading 34 % (12th)
 Monthly Average 72 %
 BAROMETER
 Monthly Mean 1019.8  hPa  
 Highest Reading 1031.4  hPa  (  6th)
 Lowest Reading 1003.4  hPa  (24th)
* Compared to average since 1984
‡ 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 SEPTEMBER 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
14.8 21.3 58 12.2 1.6 1020.4 fs 0.0 1.1 12 SSW
2nd
12.1 21.3 52 10.7 3.2 1016.1 fs 0.0 1.8 18 SSW
3rd
12.8 19.1 45 5.9 5.5 1019.1 rs 0.5 1.7 18 NNW
4th
10.9 19.2 41 5.1 7.2 1028.0 st 0.0 0.9 14 SSW
5th
8.2 23.1 61 14.4 3.3 1028.4 fs 0.0 0.4 10 SSW
6th
15.2 24.2 59 14.9 2.5 1030.2 st 0.0 0.3 10 N
7th
15.9 23.3 58 13.8 4.2 1029.7 fs 0.0 0.1 6 SE
8th
13.2 20.7 66 12.8 1.5 1025.4 f 0.0 0.6 8 NNW
9th
14.3 21.9 53 11.5 4.2 1023.5 fs 0.0 0.3 8 NNW
10th
12.8 21.2 42 7.5 5.3 1017.8 fs 0.0 1.6 21 NNW
11th
9.9 20.5 41 5.9 8.3 1025.0 st 0.0 0.7 13 NNW
12th
7.3 23.2 41 8.7 7.2 1026.5 fs 0.0 0.0 10 NNW
13th
8.2 21.7 50 10.6 6.0 1023.3 f 0.0 0.5 8 SE
14th
7.7 20.3 63 12.2 3.3 1018.8 rs 0.0 1.1 17 N
15th
7.7 20.5 53 8.9 5.5 1023.3 f 0.0 0.7 13 SW
16th
8.8 19.9 54 10.3 4.3 1010.6 f 0.0 3.1 21 SSW
17th
13.0 17.1 58 7.6 0.2 1009.7 st 0.5 1.6 14 N
18th
7.2 15.2 36 -0.5 7.0 1023.5 st 0.0 2.6 14 N
19th
7.7 17.3 65 10.2 0.3 1019.1 f 0.3 3.6 19 SSW
20th
14.2 18.6 73 12.5 1.5 1016.5 fs 0.3 5.6 21 SSW
21st
15.2 18.4 60 10.1 3.5 1016.0 st 0.0 4.3 20 SSW
22nd
12.4 20.7 68 13.2 3.7 1020.2 fs 0.0 1.0 10 SSW
23rd
10.4 20.8 62 12.1 4.8 1016.7 f 0.8 2.6 18 SW
24th
11.8 17.2 47 5.8 6.3 1009.4 rs 11.4 4.9 24 SW
25th
9.2 17.1 59 7.7 4.5 1011.8 fs 0.5 2.0 19 SSW
26th
7.9 12.7 52 2.7 3.3 1018.7 st 0.3 4.2 24 N
27th
7.3 14.2 66 7.4 3.3 1016.9 f 0.0 4.6 21 N
28th
10.1 13.4 89 11.4 0.0 1008.0 st 3.3 3.3 20 N
29th
12.5 16.1 72 10.5 0.7 1013.2 rs 4.3 0.5 12 NNW
30th
6.3 17.4 62 9.7 4.0 1021.3 st 0.0 0.4 10 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