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DECEMBER 2005
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| DECEMBER 2005 - MONTHLY SUMMARY | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| * = 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. |
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DECEMBER
2005 |
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TEMPERATURE ºc |
HUMIDITY |
SOLAR RAD* |
PRESSURE |
RAINFALL |
WIND SPEED |
DIRECTION |
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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) |
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1st |
6.9 | 8.3 | 90 | 6.1 | 12 | 995.7 fs | 1.5 | 3.8 | 25 | SE |
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2nd |
6.1 | 10.3 | 71 | 5.0 | 28 | 979.7 fs | 12.7 | 4.6 | 26 | SE |
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3rd |
6.6 | 9.4 | 83 | 5.8 | 5 | 985.2 st | 7.1 | 3.9 | 20 | SSW |
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4th |
2.9 | 6.6 | 89 | 4.8 | 18 | 989.9 st | 0.0 | 0.7 | 16 | SSW |
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5th |
4.9 | 7.8 | 77 | 3.9 | 33 | 997.7 st | 0.0 | 1.4 | 11 | SSW |
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6th |
2.6 | 6.9 | 81 | 3.4 | 28 | 1005.8 rs | 0.3 | 0.5 | 8 | SSW |
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7th |
1.4 | 7.4 | 73 | 2.5 | 9 | 1015.1 fs | 4.6 | 1.0 | 18 | SSW |
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8th |
5.6 | 7.1 | 82 | 4.1 | 11 | 1018.0 rq | 0.5 | 1.0 | 13 | SSW |
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9th |
-0.6 | 3.8 | 95 | 2.7 | * | 1037.5 st | 0.3 | 0.0 | 2 | NE |
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10th |
-2.7 | 5.8 | 94 | 4.9 | * | 1040.3 fs | 0.0 | 0.0 | 2 | NNE |
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11th |
-2.9 | 4.9 | 88 | 2.4 | * | 1037.9 fs | 0.3 | 0.0 | 5 | WNW |
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12th |
1.6 | 8.5 | 70 | 3.0 | * | 1037.9 st | 0.0 | 1.7 | 16 | N |
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13th |
5.4 | 6.8 | 64 | 0.2 | * | 1038.1 fs | 0.0 | 1.1 | 10 | N |
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14th |
3.4 | 8.1 | 77 | 4.2 | * | 1031.0 fs | 0.0 | 1.5 | 16 | NNW |
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15th |
5.8 | 10.4 | 72 | 5.5 | * | 1022.1 fs | 0.0 | 1.7 | 16 | SSW |
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16th |
7.3 | 11.9 | 54 | 1.0 | * | 1011.5 rs | 0.0 | 4.6 | 25 | N |
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17th |
0.9 | 3.8 | 50 | -5.9 | * | 1020.5 rs | 0.0 | 2.5 | 17 | N |
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18th |
-3.3 | 5.2 | 52 | -5.2 | * | 1022.0 fs | 0.5 | 1.0 | 14 | SSW |
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19th |
5.1 | 8.6 | 71 | 3.5 | * | 1023.7 rs | 0.3 | 1.1 | 17 | N |
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20th |
-2.7 | 4.9 | 86 | 1.7 | * | 1029.7 st | 0.3 | 0.0 | 7 | SSW |
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21st |
2.7 | 9.9 | 80 | 6.6 | * | 1030.5 st | 0.0 | 1.1 | 12 | SSW |
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22nd |
6.6 | 9.3 | 70 | 4.1 | * | 1029.8 fs | 0.0 | 1.3 | 11 | SSW |
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23rd |
7.6 | 9.3 | 67 | 3.5 | * | 1026.0 fs | 0.0 | 1.5 | 12 | SSW |
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24th |
7.1 | 11.7 | 69 | 6.1 | * | 1023.8 fs | 0.0 | 0.6 | 8 | SSW |
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25th |
2.3 | 6.7 | 68 | 0.9 | * | 1025.2 fs | 0.0 | 0.4 | 10 | N |
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26th |
1.4 | 5.4 | 75 | 1.2 | * | 1016.6 f | 0.0 | 1.6 | 12 | NNW |
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27th |
-0.5 | 2.0 | 77 | -1.7 | * | 1012.2 fs | ** 0.3 | 2.0 | 16 | N |
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28th |
-1.7 | 1.6 | 66 | -4.1 | * | 1015.2 st | 0.0 | 2.0 | 12 | NNW |
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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 |
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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 |
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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. |