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JANUARY 2006 daily and monthly summary

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JANUARY 2006
February 2006


Note A total hosepipe and sprinkler ban remains in effect in the Mid Kent Water supply area until further notice.
1st - 10th A very dull start to 2006 with anticyclonic gloom dominating. Cooler continental air arrives on the 5th bringing some short-lived brightness although soon turning dull and gloomy again. Light rain turned to sleet then wet snow early morning 7th, light rain again on the 8th. Late on the 10th fronts sweep across from the W, bringing milder air but severe gales to the W Isles of Scotland.
11th - 17th The temperature reaches 10ºC on the 11th for the first time since 24 Dec with the first prolonged spell of sunshine of 2006. However, cooler and gloomy conditions return, then gradually turning milder but almost always overcast with spells of rain.
18th - 21st High pressure builds - starting mild and cloudy before a cold front brings light rain showers on the morning of the 20th. Then the sky clears before midday to give a sunny afternoon! Another bright day on the 21st.
22nd - 27th Mostly overcast and cooler conditions on the 22nd herald the start of another cold spell as continental air edges in from the SE and brings an easterly wind. The 23rd is sunless again, but the sky clears overnight to allow some sunshine on the following days. The 27th was another gloomy day here (although sunny in London) with three hours of continuous light snow in the evening which settled on cars but not tarmac.
28th - 31st High pressure remains over the UK, sky mostly clear with a cool wind. The month ends on a dry note, mostly cloudy but with some sunshine on the 31st.

 JANUARY 2006 - MONTHLY SUMMARY
 TEMPERATURE
 Average Maximum 6.5
ºc 
 (-0.6)*
 Average Minimum 3.0
ºc 
 (+0.3)*
 Monthly Mean 4.5
ºc 
 
 Highest Maximum 10.6
ºc 
(18th)
 Lowest Minimum -4.8
ºc 
(25th)
 Days with Min <=0ºc 5
 
   
 
 AMBIENT TEMPERATURE
 Low Wind Chill -5.0
ºc 
(25th)
 Low Heat Index (THW) -4.8
ºc 
(28th)
 High Heat Index (THW) 10.7
ºc 
(18th)
 High Sun Index (THSW) 13.7
ºc 
(21st)
    
 
 RAINFALL
 Monthly Total 20.3
 mm
(25%)*
 Rainy Days (=>0.2mm) 11
(-7)*
 Inc days =>1mm) 10
 
 Dry Days 20
(+7)*
 Highest Daily Total 5.0
 mm
 (8th)
 Highest Rain Rate 5.6
 mm/hr
 (16th)
   
 EVAPO-TRANSPIRATION
 Highest Daily 0.9
 mm (20th)
 Monthly Total 9.4
 mm
 WIND
 Monthly Average 1.4  mph  
 Highest Gust 26  mph (20th)
 Dominant Directions SSW  (24%)
N  (12%)
SE  (12%)
ESE  (10%)
     
 SUNSHINE†
 Sunniest Day
4.2
 hrs (29th)
 Monthly Sunshine
18.9
 Hours
 Peak Solar Rad.
406
 w/m² (31st)
 Total Solar Energy
1232
 Langleys
 
   
 DEWPOINT
 Average at 14.00h 2.4 ºc
 Highest Reading 9.4 ºc   (18th)
 Lowest Reading -6.7 ºc   (25th)
 RELATIVE HUMIDITY
 Average at 14.00h 78 %
 Lowest Reading 54 % (20th)
 Monthly Average 83 %
 BAROMETER
 Monthly Mean 1022.6  hPa  
 Highest Reading 1037.6  hPa (22nd)
 Lowest Reading 993.1  hPa (1st)

Sunshine Hours are approximate only and calculated from the sensor's limited exposure to direct sun, no allowance for visual only observation. As the sensor receives only 30-40% of total possible sunshine exposure this month, the figures above can be very significantly less than the actual sunshine duration.
* = 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"

   JANUARY 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
4.1 6.5 84 3.7 0.0 1003.3 r  1.8 2.4 16 NNW
2nd
5.2 7.1 84 4.4 0.0 1024.4 st 0.0 0.4 10 N
3rd
4.2 8.7 91 6.6 0.0 1027.0 fs 1.0 0.3 8 SSW
4th
6.1 6.3 89 3.6 0.0 1028.0 st 0.0 1.0 12 N
5th
1.2 3.4 72 -2.3 0.5 1018.6 fs 0.0 0.3 11 ESE
6th
1.4 4.4 69 -0.9 0.3 1020.8 st 0.0 0.2 6 WSW
7th
0.6 3.2 89 1.5 0.0 1022.9 fs 1.3 0.0 5 SE
8th
1.7 4.5 91 2.6 0.0 1022.3 fs 5.1 0.3 11 WSW
9th
2.7 6.2 93 4.9 0.0 1025.5 st 0.0 0.3 10 SSW
10th
4.4 7.4 80 3.4 0.0 1022.4 fs 0.0 4.7 24 SSW
11th
7.4 10.2 67 4.0 1.7 1021.6 rs 1.0 3.6 22 SSW
12th
-2.9 5.4 86 2.6 0.0 1028.9 fs 0.0 0.8 14 SE
13th
5.4 6.9 82 3.9 0.0 1021.1 f  0.0 1.8 17 SE
14th
5.9 8.6 81 5.1 0.0 1020.6 fs 0.0 2.2 16 SE
15th
6.3 8.5 83 4.9 0.0 1014.8 f  0.0 1.4 16 SE
16th
6.1 8.3 90 6.3 0.0 1008.0 f  2.5 2.8 19 SSW
17th
5.8 8.7 81 5.6 0.0 1003.2 rs 3.0 1.6 19 SSW
18th
5.9 10.6 93 8.6 0.0 1014.7 rs 2.0 0.5 13 SSW
19th
8.4 10.3 88 8.3 0.0 1018.9 st 0.0 2.8 18 SSW
20th
7.8 9.7 57 1.3 2.1 1015.8 rs 1.0 4.4 26 SSW
21st
3.2 9.2 64 2.7 0.8 1027.5 st 0.0 1.1 12 N
22nd
-0.8 5.7 71 0.8 0.5 1036.4 fs 0.0 0.1 7 ESE
23rd
2.2 2.3 76 -1.9 0.0 1035.0 fs 0.0 0.4 10 ESE
24th
-4.2 3.8 68 -1.6 2.7 1029.2 fs 0.0 0.0 5 ESE
25th
-4.8 6.1 73 1.4 1.3 1023.9 fs 0.0 1.0 13 N
26th
2.3 4.5 60 -2.8 0.1 1024.4 st 0.3 3.0 21 N
27th
1.6 2.7 72 -2.1 0.0 1022.7 fs * 1.3 1.6 16 N
28th
-1.7 5.8 64 -0.5 3.0 1023.6 fs 0.0 1.5 12 NE
29th
0.7 6.2 63 -0.4 4.2 1030.4 st 0.0 1.1 13 NE
30th
3.1 5.6 75 1.2 0.0 1030.5 fs 0.0 1.7 16 NE
31st
3.1 5.8 74 0.6 1.7 1025.9 fs 0.0 1.0 12 N
                     
‡ SUN: Sunshine hours are calculated approximately and solely from solar radiation readings, but note that the solar sensor's exposure to sunshine in midwinter is very limited. The sensor receives only 30-40% 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.
* Precipitation from melted snow.
† Barometer trend: f = falling, st = steady, r = rising; q = quickly, s = slowly

'WIND ROSE' PLOT FOR THE MONTH
Wind Rose January 2006
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.