Klitch's Tonbridge Weather Station
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This page contains the April 2005 monthly stats and daily summaries for my own site readings.
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APRIL 2005
Forward to May 2005

Largely a fine and settled start to April, with a warm and sunny weekend of 2nd / 3rd April thanks to high pressure sitting to the SE of the UK. A dramatic change on the 8th as low pressure systems swept past to the north, bringing a plunge of polar air with hail and even snow showers. The air frost on the 9th was the first in April for 2 years. The weather continued to be changeable, bringing much needed rain but also some fine, sunny and warm spring afternoons. The 25th was the wettest day since the 17th December 2004, but the month ended on a warm note with the 23.6ºc recorded on the 30th being the 2nd highest April maximum since recording here began in 1987..

 APRIL 2005 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 14.7
ºc 
(+1.1º)*
 Average Minimum 5.6
ºc 
(+0.5º)*
 Monthly Mean 9.6
ºc 
(+0.8º)*
 Highest Maximum 23.6
ºc 
(30th)
 Lowest Minimum -1.1
ºc 
(9th)
 Days with Minimum <0ºc 1
 
   
 
 AMBIENT TEMPERATURE
 Lowest Wind Chill -2.2
ºc 
(9th)
 Highest Heat Index (THW) 23.3
ºc 
(30th)
 Highest Sun Index (THSW) 35.7
ºc 
(30th)
    
 
 RAINFALL
 Monthly Total 43.2
 mm
(78%)* 
 Rainy Days (=>0.3mm) 16
( +3)*
 Dry Days 14

(  -3)*

 Highest Daily Total 13.2
 mm
(25th)
 Highest Rain Rate 22.9
mm/hr
(25th)
 Snow Cover 0
 days
   
 EVAPO-TRANSPIRATION
 Highest Daily 2.9
 mm (21st)
 Monthly Total 53.7
 mm
 WIND
 Monthly Average
1.8
 mph  
 Highest Gust
25
 mph (6,8th)
 Dominant Directions SSW  (35%)  
SE  (13.8%)  
N  (12.8%)  
calm  (9.3%)  
     
 SUN
 Sunniest Day
c.11
 hrs (21st)
 Maximum Solar Rad.
1100
 w/m² (27th)
 Average Solar Rad.
207
 w/m²  
 DEWPOINT
 Average at 14.00h 4.8 ºc
 Highest Reading 14.5 ºc   (30th)
 Lowest Reading -6.8 ºc   (9th)
 RELATIVE HUMIDITY
 Average at 14.00h 60
 Lowest Reading 23 %   (21st)
 Monthly Average 73 %
 BAROMETER
 Monthly Mean 1013.2  hPa  
 Highest Reading 1030.4  hPa (11th)
 Lowest Reading 992.0  hPa (18th)

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

   APRIL 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
6.8 17.4 55 7.0 47 1023.2 fs 0.0 0.4 10 SE
2nd
6.4 19.8 28 -0.1  76 1018.2 fs 0.0 0.6 14 SE
3rd
5.4 19.2 45 6.4 70 1019.0 s  0.0 1.9 18 SSW
4th
7.7 12.3 78 5.7   6 1020.2 s  0.0 1.4 13 SSW
5th
4.2 12.2 48 1.3 55 1024.8 fs 0.0 2.8 19 SSW
6th
6.3 11.3 76 5.5 20 1009.1 fs 0.3 6.1 25 SSW
7th
6.8 12.1 56 3.0 26  999.5 s 2.8 5.0 21 SSW
8th
3.2  7.1 68 0.3 20 1010.7 rs 0.5 4.8 25 N
9th
-1.1  10.3 47 -1.9  58 1024.0 s  0.0 2.9 18 N
10th
5.8 16.3 46 2.5 73 1025.8 rs 0.0 1.8 14 N
11th
3.2 17.6 46 4.4 74 1028.9 fs 0.0 0.5 10 SSW
12th
3.9 14.2 65 7.6 22 1021.0 fs 0.0 1.4 12 SSW
13th
7.1 12.6 66 5.9 34 1007.5 f  2.0 1.5 12 SSW
14th
7.1   9.7 87 5.4   7 1001.2 s  6.1 1.1 11 SSW
15th
5.7   9.1 87 4.6   9 1004.2 rs 2.5 0.2   6 SSW
16th
1.2 12.4 57 2.5 29 1009.2 s  0.0 0.9 11 N
17th
0.4 14.9 40 0.4 77 1002.5 fs 2.3 1.3 13 SSW
18th
7.3 14.7 49 3.2 19 996.4 r 3.3 3.0 19 SSW
19th
3.3 16.8 54 6.2 26 1004.2 rs 2.8 0.7 14 SE
20th
3.3 15.3 62 4.7 82 1012.9 rs 0.0 0.5 10 N
21st
6.3 17.2 28 -1.8  77 1019.0 s  0.0 0.7 12 SE
22nd
2.4 18.2 38 2.2 75 1012.8 f  0.0 1.1 18 SE
23rd
6.9 15.6 60 6.9 22 1009.1 s  0.3 0.5 12 SE
24th
6.2 17.2 63 9.1 27 1007.4 fs 2.3 0.4   8 N
25th
8.7 11.7 88 9.3 19 1008.5 rs 13.2  0.3   7 SSW
26th
7.3 13.7 86 8.7  9 1009.6 fs 0.5 2.3 19 SSW
27th
6.1 14.1 81 6.1 82 1016.0 s  2.5 3.3 21 SSW
28th
9.1 15.3 58 6.4 51 1015.2 s  1.3 3.2 21 SSW
29th
9.8 18.4 62 10.0   78 1018.8 s  0.5 1.2 11 SSW
30th
12.4   23.6 65 13.4   27 1013.2 fs 0.0 0.8 11 SE
 
   
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 SE.

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.