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DECEMBER 2006 daily and monthly summary

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DECEMBER 2006
January 2007


Note
A total hosepipe and sprinkler ban is in effect in South East Water & Mid Kent Water supply areas until further notice.
1st - 7th
Very unsettled and wet start to the month, with a low pressure of c. 950 hPa just to W of Ireland. Passage of fronts during pre-dawn of 3rd. Increasingly stormy especially in the SW of the UK, with prolonged rain early morning of 7th. Tonbridge misses the squall line which brought a tornado to NW London.
8th - 10th
Deep low pushes across N France on the 8th with morning rain from an occlusion. The clearance brings a rare calm, sunny day on the 9th. The morning of the 10th starts sunny before turning cloudier and rain returns late in the day.
11th - 15th
Another wet and windy morning on the 11th. It remains mild and windy but turns drier for a few days as high pressure lies to the S and Lows transit to the N again bringing frequent heavy rain to Wales, NW England and W Scotland.
16th - 22nd
Passage of a cold front early hours of the 16th brings clear skies from mid morning. Ground frost 17th before another sunny day. With HP becoming dominant and calm winds, fog starts to become a regular feature from the 18th. The HP intensifies slowly over the southern UK. Prolonged sunshine and much improved visibility on the 22nd.
23rd - 27th
Worsening anticyclonic gloom with mist and poor visibility as HP centre slips slowly eastward. Finally, late on the 27th the cloud breaks before an approaching (rainless) warm front crosses overnight.
28th - 31st
Becoming increasingly stormy as LP systems reassert influence. After a sunny start the 30th is the wettest day of the year as a developing LP crosses central England. Warm and cold fronts are followed by squalls with some of the strongest wind gusts of the year here. The 31st is a near repeat.

 DECEMBER 2006 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 9.0
ºc 
(+1.3)*
 Average Minimum 5.0
ºc 
(+1.4)*
 Monthly Mean 6.9
ºc 
 
 Highest Maximum 13.6
ºc 
 (  4th)
 Lowest Minimum -3.7
ºc 
 (20th )
 Days Min <0 ºC 6
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill -3.7
ºc 
 (20th)
 Low Heat Index (THW) -3.7
ºc 
 (20th)
 High Heat Index (THW) 12.8
ºc 
 (  4th)
 High Sun Index (THSW) 13.4
ºc 
 (30th)
    
 
 RAINFALL
 Monthly Total 93.2
 mm
(126%)*
 Rainy Days (=>0.2mm) 15
(-1)*
 Inc days =>1mm) 13
 
 Dry Days 16
(+1)*
 Highest Daily Total 17.0
 mm
 (7th)
 Highest Rain Rate 107.7
 mm/hr
 (7th)
   
 EVAPO-TRANSPIRATION
 Highest Daily 1.2
 mm (7th)
 Monthly Total 15.1
 mm
 WIND
 Monthly Average 3.3  mph  
 Highest Gust 35  mph (30th)
 Dominant Directions SSW  (67%)
ESE  (  5%)
W  (  5%)
SE  (  4%)
     
 SUNSHINE†
 Sunniest Day
1.5
 hrs (9th)
 Monthly Sunshine
13.0
 Hours
 Peak Solar Rad.
282
 w/m² (8th)
 Total Solar Energy
927
 Langleys
 
   
 DEWPOINT
 Average at 14.00h 4.8 ºc
 Highest Reading 11.4 ºc   (  4th)
 Lowest Reading -4.8 ºc   (20th)
 RELATIVE HUMIDITY
 Average at 14.00h 79 %
 Lowest Reading 55 % (6th)
 Monthly Average 83 %
 BAROMETER
 Monthly Mean 1019.2  hPa  
 Highest Reading 1043.5  hPa (21st)
 Lowest Reading 981.7  hPa (  8th)
‡ 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 30% 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.
* Comparison against averages 1984 - 2005
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 DECEMBER 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
7.3 12.6 90 9.9 0.0 1015.8 f 5.1 4.2 24 SSW
2nd
9.7 10.3 79 6.4 0.5 1010.9 st 5.1 2.7 16 SSW
3rd
8.2 10.4 66 4.1 1.2 993.7 rs 14.5 7.0 33 SSW
4th
7.8 13.6 70 6.3 0.0 999.0 st 1.5 5.9 29 SSW
5th
12.3 12.7 78 8.2 0.0 991.3 st 5.6 7.9 29 SSW
6th
8.8 10.6 57 2.0 1.3 1003.9 rs 0.0 5.1 22 SSW
7th
7.1 11.6 61 3.8 0.8 987.5 fs 17.0 8.2 34 SSW
8th
5.6 7.8 84 5.2 0.2 985.3 r 4.6 2.4 20 SSW
9th
3.1 7.9 68 2.3 1.5 1013.2 r 0.0 0.8 10 SSW
10th
-1.3 8.9 66 2.8 0.7 1023.3 f 1.0 3.2 25 SSW
11th
8.8 11.6 88 7.4 0.0 1012.3 r 5.3 5.3 30 SSW
12th
1.7 10.9 72 5.4 1.2 1017.2 f 0.0 3.9 24 SSW
13th
10.4 12.2 76 7.8 0.0 1021.2 st 0.0 6.6 26 SSW
14th
11.4 12.6 76 8.1 0.0 1021.8 fs 0.0 7.1 27 SSW
15th
10.2 11.1 78 7.3 0.0 1019.2 f 0.0 5.3 21 SSW
16th
4.5 7.6 72 2.6 1.5 1022.3 st 3.0 1.7 22 SSW
17th
1.2 8.5 74 3.8 1.5 1025.4 st 0.0 0.3 7 SSW
18th
-0.3 5.8 92 4.2 0.0 1027.6 st 0.0 0.0 3 ESE
19th
-0.6 3.2 93 2.1 0.0 1037.1 st 0.0 0.0 5 WNW
20th
-3.7 2.5 93 1.5 1.3 1039.1 fs 0.3 0.1 5 W
21st
-1.3 2.7 93 0.1 0.0 1042.0 st 0.0 0.1 5 W
22nd
2.5 8.2 72 3.0 1.3 1041.3 f 0.0 0.1 6 NNW
23rd
-0.4 6.1 85 3.7 0.0 1039.4 f 0.0 0.4 6 WSW
24th
5.4 6.6 81 3.4 0.0 1036.5 fs 0.0 0.8 8 SSE
25th
4.9 5.4 82 2.5 0.0 1035.0 f 0.0 0.3 7 ESE
26th
4.2 6.2 84 3.6 0.0 1031.9 f 0.3 0.2 7 ESE
27th
2.6 4.4 84 1.3 0.0 1028.8 f 0.0 0.5 16 SE
28th
3.1 10.3 82 7.1 0.0 1024.4 f 0.0 2.8 16 SSW
29th
4.4 10.6 88 6.9 0.0 1013.9 f 4.3 4.8 31 SSW
30th
10.2 12.4 83 9.4 0.0 1006.4 f 19.8 7.7 35 SSW
31st
8.3 12.9 79 7.6 0.0 1015.2 fq 5.8 6.8 30 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 less than 50% 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