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January 2011 daily and monthly summary

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JANUARY 2011
February

1st - 4th
1st, LP 977 hPa Gulf of Bothnia, HP 1038 hPa Iceland, mainly dull with some light rain pm. 2nd, bright am with a little sunshine, cloudy pm. 3rd, broken cloud am becoming cloudy and dull by pm, very light sleet/snow briefly during evening. 4th, cloudy am slightly brighter pm with a little weak sunshine followed by light rain showers after dark. 5th, LP 987 & 985 hPa N Scotland, HP 1031 hPa Ukraine, sunny morning, cloudy pm outbreaks of rain later.
5th - 10th
Unsettled but becoming milder. 5th, LP 987 & 985 hPa N Scotland, HP 1031 hPa Ukraine, sunny morning, cloudy pm outbreaks of rain later into the night and the 6th, fronts from LP 990 hPa in English Channel bring steady rain from early am onwards, heavier later pm stopping aound 16h. 7th, a little rain after midnight followed by fog and then some brief but heavy rain midmorning, brighter pm and temperature reaches 10 °C for first time since 13th November, then more rain evening. 8th, LP 986 hPa NW of Ireland, LP 982 hPa E of Scotland, wet and windy night and into early am before brightening just after 10am, some brief sunny intervals after cold front clears. 9th, sunny and cloudless day. 10th, variable amounts of cloud with some sunshine pm, intermittent moderate rain starts after 21.30h. 11th, LP 993 hPa crosses N England and 995 hPa crosses S England, persistent moderate rain from around 01.00 to 05.00, staying cloudy. 12th, more light rain pre-dawn then overcast and dull with more rain early pm. 13th, overcast day with drizzle evening.
11th - 18th
11th, LP 993 hPa crosses N England and 995 hPa crosses S England, persistent moderate rain from around 01.00 to 05.00, staying cloudy. 12th, more light rain pre-dawn then overcast and dull with more rain early pm. 13th, overcast day with drizzle evening. 14th, light rain to around 03.00, more light rain from 07.30 with heavier burst around 11.20 for 1.5 hours, becoming dry but staying overcast until after sunset. 15th, another overcast day with brief outbreaks of light drizzle. 16th, LP 972 hPa between Iceland and Norway, HP 1032 hPa N Italy, light rain before dawn, bright morning with sunny spells, cloudier later. 17th, LP 1015 hPa Southern England with fronts moving east, moderate/heavy rain for 05.20 to 10.30, turning drizzly and becoming a little brighter pm with a glimpse of sunshine. Another spell of heavy rain starts after 22.30h until 02.00h 18th, followed by light rain and drizzle before dawn, bright day with sunny periods.
19th - 25th
19th, HP 1037 hPa N Wales, ground frost (precipitation from frostmelt), bright with sunny periods tempered at times by thin high cloud. 20th, mainly cloudy with a few sunny intervals. 21st, some drizzle at start and end of the day, cloudy am and sunny pm. 22nd, cloudy with a little light drizzle at first, brighter pm. 23rd, cloudy with a little brightness am, light rain shower late night. 24th, light rain shower after midnight, cloudy day with some sunny intervals am. 25th, a bright start becoming cloudy by midday with some light rain evening.
26th - 31st
26th, LP 1007 hPa over SE England moving SSW, HP 1031 hPa Atlantic at 55°N 20°W, cloudy with intermittent light drizzle am & pm, rain evening. 27th, overcast day with sleet & snow grains from shower for 20 mins before noon. 28th, cloudy morning, sunny periods pm. 29th, a cloudy day. 30th, HP 1030 hPa Azores & 1025 hPa Poland, cloudy am, sunny pm. 31st, cloudy but bright am, sunny pm.

JANUARY 2011 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum 7.0  ºC ( -0.1C )*
 Daily Minimum 3.7  ºC ( +1.0C )*
 Daily Mean
5.09
 ºC ( c. +0.2C )
 EXTREMES
 High Maximum 12.6  ºC ( 16th )
 Low Minimum -2.6  ºC ( 10th )
 Low Maximum 2.6  ºC (   3rd  )
 High Minimum 10.8  ºC ( 13th  )
 
   
 Days with max => 10 °C 6   ( -1 )*
 Days with max <0 °C (ice days) 0   ( -1 )*
 Days with air frost 4   ( -3 )*
 
PRECIPITATION
 Monthly Total 95.9  mm ( 126% )*
 Days with measurable precip 22  Days ( +4 )
   ...of which, days with >= 1.0 mm 11  Days ( -3 )*
   ...and days with snowfall observed 2  Days  
 Days with Snow Cover 0  Days  
 Maximum Snow Depth 0  cm  
 Days with Thunder 0  Days  
 RAIN RATE & EXTREMES
 High Rain Rate 14.2  mm/hr ( 17th )
 High Rain Total in 1 day 24.9  mm ( 17th )
 High Rain Total in 1 hour 5.3  mm ( 17th, 23.50h )
 EVAPO-TRANSPIRATION
 Total for month 13.0  mm  
 High Total for 1 day 1.0  mm ( 16th )
APPARENT TEMPERATURE
 Low Wind Chill -2.6  ºC ( 10th )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index -2.7  ºC ( 10th )
 High Temp/Hum/Wind Index 12.1  ºC ( 13th )
 High Temp/Hum/Sun/Wind Index 15.2  ºC ( 16th )
 
DEWPOINT & HUMIDITY
 High Dewpoint 10.6  ºC ( 13th )
 Low Dewpoint -5.2  ºC ( 28th  )
 Average Dewpoint at 14h 3.0  ºC  
 Low Relative Humidity 61  % (   9 & 28th )
 Average RH at 14h 80  %  
WIND SPEED & DIRECTION
 Monthly Average 2.1  mph  
 Windiest day (Average) 6.9  mph ( 15th )
 Highest Gust 30  mph (   8th )
 Dominant Direction SW  ( 34% )
 
BAROMETER
 Monthly Mean 1017.2  hPa  
 High Barometer 1038.0  hPa ( 21st  )
 Low Barometer 987.6  hPa (   8th )
SUNSHINE
 Max Sensor Exposure to direct sun
3.5
 hours/day ( 8 possible )
 Calculated Monthly Sunshine Hours
21.3
 hours  
 Estimated Actual Hours (approx)
40
 hours  
 Sunniest Day Measured
3.5
 hours ( 31st )
 Days with no sunshine
10
 Days  
 
FOG
 Number of Days with Fog 1  Day  
NEW RECORDS SET THIS MONTH
 
‡ 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 up to 25% of total possible sunshine exposure this month due to obstruction. There is no allowance for sunshine by visual observation only, so the sunniest day figures above can be very significantly less than the actual daily sunshine duration.
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 JANUARY 2011
 
TEMPERATURE ºc
HUMIDITY
SUN ‡
PRESSURE
RAINFALL
WIND SPEED
DIRECTION
 WEATHER
 NOTES
DATE
Low
(21-09h)
High
(09-21h)
Temp at 14.00z
RH %
at 14.00z
Dewpoint ºc
at 14.00z
Bright
sun hrs
hPa   †
at 14.00z
Day Total
(mm)
Average
(mph)
Max Gust
(mph)
Dominant
(Compass)
 Precipitation
 type etc ‡
                       
1st
4.6 6.4 6.3 88 4.5 0.2 1022.1 FS 0.8 0.5 7 SSW  Rain pm & eve
2nd
1.7 3.6 3.5 80 0.4 0.1 1026.8 ST 0.0 0.3 7 N  Cloudy
3rd
-0.1 2.6 2.6 80 -0.5 0.0 1022.4 F 0.0 0.0 6 SW  Cloudy
4th
-1.1 4.2 4.2 92 3.0 0.3 1010.8 F 0.5 0.6 10 SW  Rain showers pm
5th
3.3 7.2 5.7 69 0.5 1.0 997.2 F 5.8 2.9 24 SW  Rain eve.
6th
5.0 5.0 4.1 93 3.1 0.0 990.6 FS 15.2 0.4 8 N  Rain
7th
1.6 10.3 9.7 94 8.8 1.0 997.1 FS 4.3 1.9 22 SW  Rain
8th
9.2 9.8 7.6 81 4.5 0.1 998.0 R 7.6 4.1 30 SW  Rain
9th
0.8 6.3 6.2 63 -0.3 1.5 1012.4 R 0.3 0.6 11 SW  Sunny
10th
-2.6 7.7 7.7 78 4.1 1.3 1011.1 F 2.8 2.7 25 SW  Rain night pm
11th
4.3 7.9 7.2 75 3.0 0.1 1005.6 R 10.4 2.1 21 N  Rain am
12th
3.3 11.2 11.2 93 10.1 0.0 1008.7 FS 6.6 3.5 21 SW  Rain
13th
10.8 12.0 11.9 90 10.3 0.0 1009.3 FS 0.3 5.4 24 SW  Rain evening
14th
10.5 10.7 9.6 91 8.2 0.0 1007.9 FS 6.6 5.8 24 SW  Rain
15th
7.9 10.8 10.0 82 7.1 0.0 1015.5 ST 0.0 6.9 26 SW  Overcast
16th
10.3 12.6 11.6 73 6.9 0.3 1016.2 ST 0.5 6.0 24 SW  Rain night am
17th
8.6 9.6 7.2 92 6.0 0.1 1016.6 R 24.9 1.4 18 SW  Rain
18th
3.7 7.3 6.9 73 2.4 1.7 1027.1 RS 6.1 1.4 14 N  Rain am, sunny pm
19th
1.2 6.3 6.2 77 2.5 1.8 1032.6 FS 0.3 0.6 11 WNW  Sunny periods
20th
3.9 5.7 5.7 75 1.6 0.3 1034.3 ST 0.0 1.6 14 N  Cloudy
21st
2.6 4.1 3.7 73 -0.7 2.3 1036.3 FS 0.5 0.7 8 N  Drizzle
22nd
0.8 6.1 5.7 87 3.7 0.0 1033.4 F 0.0 2.0 14 N  Cloudy
23rd
4.6 7.3 7.0 85 4.6 0.1 1030.9 FS 0.3 3.2 18 N  Rain sh. night pm
24th
5.9 6.8 6.8 75 2.7 0.7 1028.0 FS 0.3 2.1 14 N  Cloudy
25th
3.3 8.2 7.8 84 5.3 0.2 1014.0 F 0.5 1.5 10 SW  Rain evening
26th
5.7 6.8 6.7 86 4.5 0.0 1007.1 ST 1.0 1.4 14 N  Rain evening
27th
2.0 3.0 2.8 69 -2.3 0.0 1019.3 ST 0.3 1.7 13 NE  Sleet/snow am
28th
0.4 2.9 2.2 64 -3.9 2.5 1020.3 F 0.0 1.6 13 NE  Sunny periods pm
29th
0.9 2.8 2.7 77 -1.6 0.0 1020.0 FS 0.0 1.6 13 N  Cloudy
30th
-0.4 6.1 5.9 63 -0.6 2.2 1020.6 FS 0.0 1.1 11 SW  Sunny pm
31st
1.2 4.4 4.4 65 -1.6 3.5 1024.1 FS 0.0 0.4 10 N  Sunny periods
                         
‡ 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 25% 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
Weather Notes use METAR codes: OVC = overcast; SHRA = rain showers; '+' = heavy; CAVOK = no cloud below 5000 ft & visibility> 10 km & no fog, precipitation or snow; SN = snow; RASN = Rain and snow