Klitch's Tonbridge Weather Station
Back to home page  |  Live updates   |  Latest satellite image |  Recent observations for British Isles | World reports

This page contains the May 2005 monthly stats and daily summaries for my own site readings.
Return to Daily Summaries Index
Back to April 2005
MAY 2005
Forward to June 2005

A warm and sunny start to May proved not to be a reliable indicator of things to come. The pattern soon settled into three weeks of domination by mainly northerly winds which brought cool conditions with little rain. Although there was a normal amount of sunshine, it didn't counteract the cooling effect of the wind and temperatures remained generally 2 - 4C below the average for the time of year. There was a sharp change on the 25th with warm southerly air pushing in from the Iberian peninsula, and a new site high temperature record for May (the hottest May day for 52 years in the UK), but the heat was short lived. A thunderstorm was largely responsible for the rainfall total on the 30th, giving nearly 14mm in little over half an hour, but water use restrictions remain a real possibility with a hosepipe ban already in effect in neighbouring North Sussex.

 MAY 2005 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 16.9
ºc 
 (-0.5º)
 Average Minimum 7.9
ºc 
 (-0.3º)
 Monthly Mean 12.0
ºc 
 (±0º)
 Highest Maximum 30.9
ºc 
 (27th)
 Lowest Minimum 1.8
ºc 
 (11th)
 Days with Max >25ºc 1    
       
 AMBIENT TEMPERATURE
 Lowest Wind Chill 1.8
ºc 
 (11th)
 Highest Heat Index (THW) 30.8
ºc 
 (30th)
 Highest Sun Index (THSW) 39.7
ºc 
 (30th)
        
 RAINFALL
 Monthly Total 36.5
 mm
(84%)
 Rainy Days (=>0.3mm) 11   (±0)
 Dry Days 20   (±0)
 Highest Daily Total 17.0
 mm
(30th)
 Highest Rain Rate 146.3
mm/hr
(30th)
 Wet days =>10mm) 1
 
     
 EVAPO-TRANSPIRATION
 Highest Daily 4.8
 mm (27th)
 Monthly Total 79.6
 mm
 WIND
 Monthly Average
2.3
 mph  
 Highest Gust
26
 mph (28th)
 Dominant Directions SSW  (35.5%)
N  (16.4%)
Calm  (10.7%)
SE  (5.7%)
     
 SUN
 Sunniest Day
c 12.5
 hrs (23rd)
 Maximum Solar Rad.
1209
 w/m²  
 Average Solar Rad.
255
 w/m²  
 DEWPOINT
 Average at 14.00h 6.4 ºc
 Highest Reading 16.7 ºc   (27th)
 Lowest Reading -3.0 ºc   (8th)
 RELATIVE HUMIDITY
 Average at 14.00h 57 %
 Lowest Reading 30 %  (8th)
 Monthly Average 70 %
 BAROMETER
 Monthly Mean 1016.4  hPa  
 Highest Reading 1026.2  hPa (11th)
 Lowest Reading 1004.4  hPa (22nd)

* = deviation from 20 year average. The monthly mean is calculated from all logged temperatures and is not the simple mean of the daily 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"

   MAY 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
13.3 24.0 43 9.6 52 1007.0 s  0.0 1.1 12 SSW
2nd
12.6 20.7 61 12.1  33 1011.6 rs 2.0 1.6 16 SSW
3rd
10.9 16.2 76 10.1  27 1010.5 fs 0.5 2.8 19 SSW
4th
10.9 13.0 80 7.6  6 1018.9 r  0.0 2.7 20 N
5th
 3.3 17.4 64 7.0 24 1021.2 f  0.0 1.4 13 N
6th
 9.3 16.4 39 1.4 54 1017.6 s  0.0 2.3 17 N
7th
 9.6 14.5 46 2.3 86 1011.4 s  0.3 3.9 21 N
8th
 5.4 14.3 36 -1.3  18 1012.1 f  1.5 1.8 18 SSW
9th
 3.4 13.6 45 1.6 27 1016.0 s  0.0 1.2 14 N
10th
 2.4 12.3 71 4.2 32 1022.2 rs 0.0 1.1 18 N
11th
 1.8 15.2 43 1.4 96 1025.5 s  0.0 0.8 12 N
12th
 2.9 14.8 48 3.6 80 1020.7 fs 0.0 1.9 17 WSW
13th
 8.3 15.7 67 5.6 45 1018.4 s  0.0 2.6 17 WSW
14th
 7.2 14.3 53 4.0 33 1016.9 rs 0.0 1.6 14 N
15th
 2.4 18.9 39 2.9 79 1017.6 fs 0.0 0.6 10 SE
16th
 5.3 16.8 59 6.7 47 1014.9 s  3.8 1.5 14 N
17th
 4.1 12.7 50 -0.3  42 1020.3 s  0.0 1.4 13 N
18th
 3.3 15.3 41 1.0 37 1021.8 s  0.0 1.7 16 SSW
19th
 9.7 13.1 89 11.1  10 1015.5 fs 4.3 3.3 17 SSW
20th
11.7 16.8 71 11.0  37 1010.3 s  2.0 4.4 25 SSW
21st
 9.8 16.2 62 8.2 27 1007.5 f  3.3 3.5 24 SSW
22nd
 8.8 16.3 57 7.1 85 1007.1 s  0.0 4.8 20 SSW
23rd
 8.3 15.7 50 4.9 51 1015.9 rs 0.8 5.0 20 SSW
24th
 9.2 13.3 88 10.2  11 1016.8 s  1.0 5.0 22 SSW
25th
10.3 22.3 62 12.2  45 1021.8 fs 0.0 2.5 14 SSW
26th
11.4 23.6 55 13.1  50 1015.8 s  0.0 1.9 16 SSW
27th
11.8 30.9 41 14.4  80 1009.8 fs 0.0 1.6 16 SE
28th
13.7 17.9 56 8.5 26 1015.8 rs 0.0 4.9 26 SSW
29th
 8.0 16.2 49 5.3 32 1020.0 s  0.0 0.4  6 SSW
30th
10.4 16.3 82 8.5 64 1022.9 r  17.0  0.5 14 SSW
31st
 5.8 19.9 45 5.5 29 1024.8 s  0.0 1.3 12 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, s = steady, r = rising; r = rapidly, 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.