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SEPTEMBER 2005 daily and monthly summary

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SEPTEMBER 2005
October 2005
Note A total hosepipe and sprinkler ban remains in effect in the Mid Kent Water supply area as at 23rd September
1st - 9th A hot and sunny start to the month. Lengthy - albeit hazy - sunny periods and mild, muggy nights. Two new September site records set since recording began in 1984: the 1st had the highest night-time minimum, and the 4th had the highest daytime maximum. Showers on the 5th and 6th gave way to another spell of fine, warm weather.
10th - 15th Thunderstorms in the vicinity on the evening/night of the 10th but not passing overhead. The 11th was a sunless day and the 12th and 15th also rather dull.
16th - 22nd A cold front brings an abrupt change to cool Polar Maritime air with a very marked reduction in dewpoint and fresh Northerly winds. A ridge of high pressure slowly brings settled, brighter and milder conditions, but resulted in dense fog on the mornings of the 21st and 22nd.
23rd - 30th Turning more unsettled, with sunshine and showers due to a series of lows brushing the NW of Scotland.
 SEPTEMBER 2005 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 20.9
ºc 
 ( +2.1)*
 Average Minimum 11.7
ºc 
 ( +1.4)*
 Monthly Mean 15.6
ºc 
  
 Highest Maximum 28.9
ºc 
 (4th)
 Lowest Minimum 6.7
ºc 
 (18th)
 Days with Max >25ºc 4
 
   
 
 AMBIENT TEMPERATURE
 Lowest Wind Chill 6.7
ºc 
 (18th)
 Highest Heat Index (THW) 29.4
ºc 
 (4th)
 Highest Sun Index (THSW) 36.0
ºc 
 (9th)
    
 
 RAINFALL
 Monthly Total 24.6
 mm
 (41%)
 Rainy Days (=>0.2mm) 11
±0 *
 Wet days =>10mm) 0
 
 Dry Days 19
±0 *
 Highest Daily Total 5.1
 mm
 (15th)
 Highest Rain Rate 12.7
 mm/hr
 (6th)
   
 EVAPO-TRANSPIRATION
 Highest Daily 2.65
 mm (4th)
 Monthly Total 49.0
 mm
 WIND
 Monthly Average
1.4
  mph  
 Highest Gust
19
  mph (15/16th)
 Dominant Directions SSW  (35.7%)
Calm  (21.8%)
N  (11.0%)
SE  (5.7%)
     
 SUNSHINE
 Sunniest Day
c 11
 hrs (8th)
 Maximum Solar Rad.
915
  w/m² (1st)
 Avg Daily Solar Rad.
187
  w/m²  
 DEWPOINT
 Average at 14.00h 11.9 ºc
 Highest Reading 18.3 ºc   (4th)
 Lowest Reading 1.1 ºc   (17th)
 RELATIVE HUMIDITY
 Average at 14.00h 61 %
 Lowest Reading 39 %  (17th)
 Monthly Average 77 %
 BAROMETER
 Monthly Mean 1017.6  hPa  
 Highest Reading 1028.5  hPa (3rd)
 Lowest Reading 1007.8  hPa (9th)

* = deviation from 20 year average. The monthly mean is calculated from all logged temperatures and is not the simple mean of the average minimum and maximum.
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"
   SEPTEMBER 2005
TEMPERATURE ºc
HUMIDITY
SOLAR RAD
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
DATE
Minimum
(< 09h)
Maximum
(< 21h)
RH %
at 14.00
Dewpoint ºc
at 14.00
% of max
(Noon GMT)
hPa †
at 14.00
Day Total
(mm)
Average
(mph)
High Gust
(mph)
Dominant
(Compass)
 
1st
 17.7 23.2 61 14.7 36 1014.7 fs 0.0 2.8 17 SSW
2nd
 10.9 24.5 45 11.0 40 1025.7 st 0.0 0.3 9 N
3rd
 13.7 27.4 51 14.5 77 1026.6 f  0.0 0.4 12 SE
4th
 13.0 28.9 44 14.5 69 1019.3 f  0.0 0.6 14 SE
5th
 17.7 24.1 58 14.9 44 1012.4 fs 0.8 0.8 11 SSW
6th
 14.2 21.3 81 15.3 22 1009.1 fs 4.6 0.0 5 S
7th
 10.1 25.1 52 14.4 61 1011.6 fs 0.0 1.6 17 SSW
8th
 13.5 24.1 54 14.0 71 1012.3 fs 0.0 1.4 12 SSW
9th
 13.4 26.9 61 18.0 29 1008.6 fs 0.0 0.4 11 SE
10th
 16.6 23.6 67 16.7 55 1009.1 st 1.8 0.4 8 SSW
11th
 15.4 17.7 85 14.4 19 1013.7 st 0.0 1.7 16 N
12th
 15.0 20.1 79 13.3 18 1022.0 rs 0.0 0.7 8 N
13th
 8.5 23.1 50 11.2 82 1024.4 f  0.0 1.1 12 SSW
14th
 15.4 22.4 75 15.5 16 1021.6 st 0.0 3.1 17 SSW
15th
 13.7 18.4 91 16.5 7 1013.0 f  5.1 2.6 19 SSW
16th
 10.8 15.9 54 5.5 26 1017.9 r  3.0 3.3 19 N
17th
 6.8 15.7 46 3.1 50 1025.6 st 0.0 1.1 13 N
18th
 6.7 17.2 57 7.9 53 1027.3 fs 0.0 0.3 7 SSW
19th
 11.3 19.9 55 8.8 68 1025.1 fs 0.0 0.7 12 SSW
20th
 7.7 20.4 60 11.8 82 1024.4 fs 0.0 0.5 10 SSW
21st
 12.7 20.3 68 13.0 23 1022.0 fs 0.0 0.2 7 SSW
22nd
 7.7 22.3 54 11.5 68 1018.4 fs 0.0 0.4 10 SE
23rd
 7.7 20.4 54 9.6 30 1010.9 fs 0.8 1.1 17 SSW
24th
 7.7 17.8 62 10.0 48 1017.1 f  0.0 0.3 8 SE
25th
 10.1 20.0 57 10.9 73 1009.9 st 1.0 2.3 18 SSW
26th
 8.4 17.4 62 9.9 34 1016.3 fs 0.0 3.1 19 SSW
27th
 15.2 19.1 58 9.9 35 1014.1 st 0.0 3.3 18 SSW
28th
 6.8 14.6 56 5.7 35 1019.9 fs 2.5 3.1 18 SSW
29th
 8.7 15.6 49 4.6 69 1020.6 rs 0.5 1.7 14 SSW
30th
 9.8 18.2 88 16.0 15 1016.9 fs 3.0 2.9 18 SSW
 
   
Solar Rad(iation) reading indicates the state of the sky (approximately) at just after 12h00 GMT as below:
1 - 10 = Dull overcast; 11 - 20 = overcast; 21 - 49 = cloudy; 50 - 74 = hazy or interrupted sunshine; 75 - 100 = bright uninterrupted sunshine
† Barometer trend: f = falling, st = steady, r = rising; q = quickly, s = slowly
'WIND ROSE' PLOT FOR THE MONTH
The 'petals' represent wind direction and the length represents frequency, i.e. in this case winds from the SSW were the most common, followed by the N.

The colours represent the strength of the wind, with black being weakest through blue then lighter colours (cyan, light green, yellow, magenta, red) being stronger.

This data excludes 'calm' readings.