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DECEMBER 2005 daily and monthly summary

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DECEMBER 2005
January 2006

 DECEMBER 2005 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 7.1
ºc 
 (-0.6º)*
 Average Minimum 2.6
ºc 
 (-1.0º)*
 Monthly Mean 4.6
ºc 
 
 Highest Maximum 11.9
ºc 
(2nd)
 Lowest Minimum -3.3
ºc 
(18th)
 Days with Min<=0ºc 9
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill -3.9
ºc 
(28th)
 Low Heat Index (THW) -4.3
ºc 
(28th)
 High Heat Index (THW) 11.3
ºc 
(24th)
 High Sun Index (THSW) 14.5
ºc 
(24th)
    
 
 RAINFALL
 Monthly Total 34.3
 mm
 (47%)*
 Rainy Days (=>0.2mm) 14
 (-2)*
 Inc wet days =>10mm) 1
 Dry Days 17
  (+2)*
 Highest Daily Total 12.7
 mm
 (2nd)
 Highest Rain Rate 34.3
 mm/hr
 (2nd)
   
 EVAPO-TRANSPIRATION
 Highest Daily 1.1
 mm (16th)
 Monthly Total 10.3
 mm
 WIND
 Monthly Average
1.6
 mph  
 Highest Gust
26
 mph (2nd)
 Dominant Directions SSW  (33%)
N  (18%)
NNW  (14%)
W  ( 9%)
     
 SUNSHINE
 Sunniest Day
>6.5
 hrs (18th)
 Peak Solar Rad.
297
 w/m² (2nd)
 Avg Daily Solar Rad.
50
 w/m²  
 Tot Monthly Solar Energy.
1107
 Langleys
 
   
 DEWPOINT
 Average at 14.00h 2.3 ºc
 Highest Reading 7.2 ºc   (16th)
 Lowest Reading -8.3 ºc   (17th)
 RELATIVE HUMIDITY
 Average at 14.00h 75 %
 Lowest Reading 44 % (17th)
 Monthly Average 81 %
 BAROMETER
 Monthly Mean 1017.1  hPa  
 Highest Reading 1041.5  hPa (10th)
 Lowest Reading 977.9  hPa (2nd)
* = 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"
Note A total hosepipe and sprinkler ban remains in effect in the Mid Kent Water supply area until further notice.
1st - 3rd A deep low (963 hPa) crosses SW England into the Midlands bringing a wet and windy start to the month.
4th - 8th As the low drifts slowly northwards and fills, conditions become settled, but mostly cloudy. A front brings rain overnight on the 7th/8th but after it clears pressure starts to rise rapidly.
9th - 16th High pressure builds to the NE, the 9th has dense fog with visibility <200m for most of the day. The high slips southwards to bring frosty nights with mist and sunny days, but sunshine on the 11th was obscured late in the afternoon by smoke from the large oil depot explosion and fire at Hemel Hempstead some 55 miles away. On the 12th a weak cold front actually brought slightly higher temperatures but strengthening wind. Continuing dry - the small rainfall amounts were due to condensation from fog and dew.
17th - 19th A cold front sweeps down from the north during the night of the 16/17th bringing prolonged sunshine but cool winds. Overnight light rain on the 18/19th but both days were sunny during the daytime.
20th - 26th Rather bland weather with a lot of cloud from the 20th, and anti-cyclonic gloom on the 23rd. Long spells of sunshine on the 24th and 25th, but gradually becoming cooler as air from the NE pushes in.
27th - 30th Snow showers 27th (morning/evening) and 28th (night), just a dusting on the ground. The 29th was the first ice day here since 1997. More snow on the morning of the 30th precedes rain and less cold Atlantic air.

   DECEMBER 2005
TEMPERATURE ºc
HUMIDITY
SOLAR RAD*
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
DATE
Minimum
(21-09h)
Maximum
(09-21h)
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
6.9 8.3 90 6.1 12 995.7 fs 1.5 3.8 25 SE
2nd
6.1 10.3 71 5.0 28 979.7 fs 12.7 4.6 26 SE
3rd
6.6 9.4 83 5.8 5 985.2 st 7.1 3.9 20 SSW
4th
2.9 6.6 89 4.8 18 989.9 st 0.0 0.7 16 SSW
5th
4.9 7.8 77 3.9 33 997.7 st 0.0 1.4 11 SSW
6th
2.6 6.9 81 3.4 28 1005.8 rs 0.3 0.5 8 SSW
7th
1.4 7.4 73 2.5 9 1015.1 fs 4.6 1.0 18 SSW
8th
5.6 7.1 82 4.1 11 1018.0 rq 0.5 1.0 13 SSW
9th
-0.6 3.8 95 2.7 * 1037.5 st 0.3 0.0 2 NE
10th
-2.7 5.8 94 4.9 * 1040.3 fs 0.0 0.0 2 NNE
11th
-2.9 4.9 88 2.4 * 1037.9 fs 0.3 0.0 5 WNW
12th
1.6 8.5 70 3.0 * 1037.9 st 0.0 1.7 16 N
13th
5.4 6.8 64 0.2 * 1038.1 fs 0.0 1.1 10 N
14th
3.4 8.1 77 4.2 * 1031.0 fs 0.0 1.5 16 NNW
15th
5.8 10.4 72 5.5 * 1022.1 fs 0.0 1.7 16 SSW
16th
7.3 11.9 54 1.0 * 1011.5 rs 0.0 4.6 25 N
17th
0.9 3.8 50 -5.9 * 1020.5 rs 0.0 2.5 17 N
18th
-3.3 5.2 52 -5.2 * 1022.0 fs 0.5 1.0 14 SSW
19th
5.1 8.6 71 3.5 * 1023.7 rs 0.3 1.1 17 N
20th
-2.7 4.9 86 1.7 * 1029.7 st 0.3 0.0 7 SSW
21st
2.7 9.9 80 6.6 * 1030.5 st 0.0 1.1 12 SSW
22nd
6.6 9.3 70 4.1 * 1029.8 fs 0.0 1.3 11 SSW
23rd
7.6 9.3 67 3.5 * 1026.0 fs 0.0 1.5 12 SSW
24th
7.1 11.7 69 6.1 * 1023.8 fs 0.0 0.6 8 SSW
25th
2.3 6.7 68 0.9 * 1025.2 fs 0.0 0.4 10 N
26th
1.4 5.4 75 1.2 * 1016.6 f  0.0 1.6 12 NNW
27th
-0.5 2.0 77 -1.7 * 1012.2 fs ** 0.3 2.0 16 N
28th
-1.7 1.6 66 -4.1 * 1015.2 st 0.0 2.0 12 NNW
29th
-1.4 0.0 79 -3.9 * 1015.5 fs 0.0 0.2 5 NNW
30th
-2.7 8.4 91 1.7 * 994.9 fa 5.1 2.8 24 SE
31st
6.4 8.4 74 3.6 * 993.2 fs 0.5 4.3 18 SSW
 
   
Solar Rad(iation) reading indicates the state of the sky (approximately) at just after 12h00 GMT as below:
* Due to surrounding buildings, the sensor's exposure to sunlight is virtually zero in midwinter.
1 - 10 = Dull overcast; 11 - 20 = overcast; 21 - 49 = cloudy; 50 - 74 = hazy or interrupted sunshine; 75 - 100 = bright uninterrupted sunshine.
** snow
† Barometer trend: f = falling, st = steady, r = rising; q = quickly, s = slowly

'WIND ROSE' PLOT FOR THE MONTH
Wind Rose - Dec 2005
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.