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September 2006 daily and monthly summary

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SEPTEMBER 2006
October 2006


Note
A total hosepipe and sprinkler ban is in effect in South East Water & Mid Kent Water supply areas until further notice.
1st - 3rd
HP lies across southern Europe with LP to the N and W of the UK. Secondary LP centre crosses Solway Firth on 2nd resulting in a very dull and windy Saturday. A dull start to the Sunday turned into a bright, breezy but warm and very muggy afternoon as tropical maritime air floods in.
4th - 8th
HP is in control; very warm and humid with long sunny periods. Passage of a weak cold front overnight on the 7th brings no rain but a much fresher feel.
9th - 15th
HP then moves to SE of the UK and then further E. Prolonged sunny periods and becoming rather hot with calm conditions. Thundery shower at sunrise on 12th, early hours of 13th and thunderstorm same evening. Pressure deepens, rain early morning 15th.
16th - 21st
A rather quiet and settled spell, becoming fresher from the 18th. Brief rain shower early hours of 19th. Remnants of ex-Hurricane Gordon move toward the SW, bringing a surge of very warm air with clear skies. The 21st Sept is the latest date >= 27 ºC been recorded here since data collection began.
22nd - 29th
Intermittent rain and heavy showers from a frontal wave lasted into late afternoon on 22nd. Localised downpours on the 24th as a slow moving front tracks across S and E England, flooding in E Anglia. More showers 28th and 29th. Unsettled weather looks set to signal the onset of autumn with a 975 hPa low to the W of Ireland.

 SEPTEMBER 2006 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 22.1
ºc 
 (+2.2)
 Average Minimum 13.7
ºc 
 (+3.3)
 Monthly Mean 17.2
ºc 
 
 Highest Maximum 28.7
ºc 
 (11th)
 Lowest Minimum 7.7
ºc 
 (10th )
 Days Max >= 25º 4
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill 7.8
ºc 
 (10th)
 Low Heat Index (THW) 7.8
ºc 
 (10th)
 High Heat Index (THW) 28.1
ºc 
 (11th)
 High Sun Index (THSW) 33.8
ºc 
 (11th)
    
 
 RAINFALL
 Monthly Total 39.1
 mm
(67%)
 Rainy Days (=>0.2mm) 12
(+1)
 Inc days =>1mm) 7
 
 Dry Days 18
(-1)
 Highest Daily Total 14.8
 mm
 (22nd)
 Highest Rain Rate 47.2
 mm/hr
 (12th)
   
 EVAPO-TRANSPIRATION
 Highest Daily 2.85
 mm (4th)
 Monthly Total 55.5
 mm
 WIND
 Monthly Average 1.6  mph  
 Highest Gust 25  mph (2nd)
 Dominant Directions SSW  (49%)
SE  (12%)
N  (  8%)
NNW  (  7%)
     
 SUNSHINE†
 Sunniest Day
7.0
 hrs ( 9th)
 Monthly Sunshine
117.4
 Hours
 Peak Solar Rad.
961
 w/m² (14th)
 Total Solar Energy
6824
 Langleys
 
   
 DEWPOINT
 Average at 14.00h 12.6 ºc
 Highest Reading 17.5 ºc   (3rd)
 Lowest Reading 5.6 ºc   (7th)
 RELATIVE HUMIDITY
 Average at 14.00h 60 %
 Lowest Reading 34 % (11th)
 Monthly Average 76 %
 BAROMETER
 Monthly Mean 1012.5  hPa  
 Highest Reading 1030.9  hPa ( 8th)
 Lowest Reading 1000.5  hPa (21st)
‡ 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 60% 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 2006
 
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
13.9 22.3 45 8.9 4.5 1012.9 f 0.0 1.9 20 SSW
2nd
15.0 17.7 81 13.6 0.0 1008.5 f 1.0 4.5 25 SSW
3rd
17.0 23.1 75 16.8 4.7 1009.5 rs 0.3 5.8 22 SSW
4th
14.8 23.9 52 12.2 5.3 1023.2 st 0.0 2.3 13 SSW
5th
17.6 24.2 62 14.9 3.3 1023.2 fs 0.0 1.8 12 SSW
6th
13.2 26.4 58 16.8 5.5 1015.8 fs 0.0 1.2 13 SSW
7th
14.2 21.1 43 7.3 4.8 1021.4 rs 0.0 2.3 18 NNW
8th
9.4 21.7 49 9.2 5.8 1029.6 fs 0.0 0.6 11 WSW
9th
8.7 23.8 39 7.8 7.0 1023.8 f 0.0 0.7 14 ESE
10th
7.7 26.8 40 10.9 7.0 1020.2 fs 0.0 0.0 0 Calm
11th
10.9 28.7 38 11.8 6.5 1016.7 fs 0.0 0.4 13 SE
12th
16.2 23.9 62 15.3 5.8 1014.8 fs 0.3 0.1 7 W
13th
15.3 24.1 66 16.3 2.7 1009.1 fs 13.0 0.8 14 SE
14th
15.6 20.8 73 14.7 0.8 1003.3 rs 0.3 0.9 14 SSW
15th
14.6 20.9 69 14.2 5.0 1007.7 fs 2.0 2.4 18 N
16th
15.7 22.0 69 14.9 2.8 1009.1 st 0.0 1.4 11 N
17th
16.7 22.1 61 13.0 4.2 1011.7 st 0.0 1.0 11 SSW
18th
15.0 20.7 53 9.0 3.8 1012.1 fs 0.0 2.6 18 SSW
19th
12.8 19.8 48 7.6 5.0 1014.0 rs 0.5 2.8 20 SSW
20th
9.6 22.4 49 10.3 6.7 1011.1 fs 0.0 2.0 19 SSW
21st
13.4 27.4 46 13.5 6.2 1002.8 f 0.0 1.7 19 SE
22nd
15.9 18.0 89 14.4 1.8 1004.2 st 14.8 0.9 13 SSW
23rd
11.7 23.2 64 15.4 4.7 1008.3 f 0.0 0.3 10 SE
24th
14.3 22.0 61 12.8 1.7 1005.3 st 0.0 0.8 16 SE
25th
14.5 18.1 75 13.3 0.0 1007.9 rs 3.6 0.4 11 SSW
26th
12.3 20.9 57 11.4 6.5 1016.6 st 0.0 0.8 11 SSW
27th
10.1 19.2 63 11.9 1.5 1012.6 f 0.0 1.6 18 SSW
28th
16.2 18.8 79 14.7 0.2 1007.8 st 0.5 2.2 13 SSW
29th
16.2 20.4 75 13.5 0.8 1003.3 fs 1.8 2.4 19 SSW
30th
11.8 19.7 65 12.0 2.8 1006.4 st 1.0 1.5 14 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 only 65% 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