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OCTOBER 2010 daily and monthly summary

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OCTOBER 2010
November

1st - 6th
A very wet, unsettled and dismal spell. 1st, blocking HP 1026 hPa N Sweden and Gulf of Bothnia, LP 974 hPa NW of Ireland, series of fronts across the UK, light rain from 10am becoming moderate late pm and showery evening persisting to past midnight 2nd, mist am, light rain from 13.00h through to night. 3rd, LP 989 hPa Bristol Channel, rain starts just before midday lasting about 4 hours with a dry spell then more rain late evening/night. 4th, further light/moderate rain on and off from midnight to 07.00. 5th, drizzle and light rain am, dry from early afternoon with just a glimpse of sunshine. 6th, steady rain from 01.00 to 06.00, showers later am, bright pm with sunny spells.
7th - 15th
7th, HP 1041 hPa E of Baltic states, LP 966 hPa NNE of Azores, sunny spells, light rain shower evening. 8th, light drizzle pre-dawn, fog with visibility down to 150m until 10.30am, periods of hazy sunshine rest of day. 9th, a rather murky and cloudy day. 10th, HP 1033 hPa N of Scotland, HP 1022 hPa N Poland, LP 1000 hPa Biscay, long sunny periods. 11th, uninterrupted sunshine from 09.00. 12th, sunny intervals, mainly pm. 13th, mainly cloudy with sunny intervals pm, and same again on 14th. 15th, more cloudy with short lived brightness, light rain evening/night from cold front.
16th - 22nd
16th, HP 1027 hPa stretches from 40°W to the UK, LP 1004 hPa Gulf of Genoa, drizzle after midnight, cloudy early am brighter later with sunny spells pm.17th, again mainly cloudy with some sunshine pm. 18th, once again mainly cloudy with some sunshine early pm. 19th, HP 1029 hPa Mid Atlantic, LP 993 hPa S Norway, moderate rain from cold front passage early am, sunny periods then moderate rain late pm from another cold front. 20th, a sunny day. 21st, ground frost, sunny day until cloudy late pm. 22nd, mainly cloudy with a few sunny spells.
23rd - 28th
23rd, LP 994 hPa off NE England coast, moderate rainfall just before sunrise from cold front, sunny intervals, heavy rain shower pm. 24th, mainly sunny, heavy hail shower late pm. 25th, HP 1030 hPa Southern UK, almost uninterrupted sunshine. 26th, HP to S and SE, LP 993 hPa Faeroe I, rain from warm front pm into early evening. 27th, overcast with light rain/drizzle am, brighter pm. 28th, some light drizzle early am and late pm otherwise mainly cloudy with a little brightness and sunshine.
29th - 31st
29th, LP 969 hPa Faeroe Islands, LP 980 hPa N Ireland, gloomy morning cloud thinning later with some brief weak sunshine pm. 30th, sunny spells, heavy rain showers around midday. 31st, rain am, a little brighter pm.

OCTOBER 2010 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
14.7
 ºC ( -0.3C )*
 Daily Minimum 8.4  ºC ( +0.4C )*
 Daily Mean
11.12
 ºC ( ±0.0C )*
 EXTREMES
 High Maximum
23.2
 ºC (   8th )
 Low Minimum -1.2  ºC ( 21st )
 Low Maximum
8.8
 ºC ( 20th )
 High Minimum
14.2
 ºC (   3rd )
 
   
 Days with max => 15 °C
14
  ( -2 )*
 Days with max <10 °C
1
  ( ±0 )*
 Days with air frost
1
  ( ±0 )*
 
PRECIPITATION
 Monthly Total
67.0
 mm ( 82% )
 Days with measurable precip
19
 Days ( +4 )*
   ...of which, days with >= 1.0 mm
13
 Days ( +1 )*
   
   
 Days with hail
1
 Days  
 Days with Thunder
0
 Days  
 RAIN RATE & EXTREMES
 High Rain Rate
20.6
 mm/hr ( 30th )
 High Rain Total in 1 day
15.0
 mm (   1st)
 High Rain Total in 1 hour
3.0
 mm ( 1st, 18.00h )
 EVAPO-TRANSPIRATION
 Total for month
34.8
 mm  
 High Total for 1 day
2.1
 mm ( 11th )
APPARENT TEMPERATURE
 Low Wind Chill
-1.3
 ºC ( 21st )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
-1.3
 ºC ( 21st )
 High Temp/Hum/Wind Index
23.7
 ºC ( 8th )
 High Temp/Hum/Sun/Wind Index
29.3
 ºC ( 8th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
16.4
 ºC (   8th)
 Low Dewpoint
-3.7
 ºC ( 20th )
 Average Dewpoint at 14h
68
 ºC  
 Low Relative Humidity
43
 % ( 11th )
 Average RH at 14h
8.0
 %  
WIND SPEED & DIRECTION
 Monthly Average
1.7
 mph  
 Windiest day (Average)
4.3
 mph ( 27th)
 Highest Gust
26
 mph (   1st )
 Dominant Direction
SW
 ( 28% )
 
BAROMETER
 Monthly Mean
1011.8
 hPa  
 High Barometer
1028.8
 hPa ( 25th )
 Low Barometer
993.4
 hPa ( 29th )
SUNSHINE
 Max Sensor Exposure to direct sun
7.5
 hours/day (10 - 11 possible)
 Calculated Monthly Sunshine Hours
85.7
 hours  
 Estimated Actual Hours (approx)
101.0
 hours  
 Sunniest Day Measured
7.2
 hours ( 20th )
 Days with no sunshine
3
 Days  
 
FOG
 Number of Days with Fog
6
 Days  
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 65% 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 OCTOBER 2010
 
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
10.6 16.0 13.8 89 12.1 0.0 1000.6 F 15.0 2.9 26 SW  Rain
2nd
9.4 15.8 15.1 88 13.1 0.3 1003.0 7.4 1.0 18 SW  Rain
3rd
14.2 17.4 14.4 88 12.4 0.3 994.5 RS 6.6 3.1 25 SW  Rain
4th
13.3 17.5 17.1 84 14.4 0.3 996.6 FS 4.8 0.3 8 SE  Rain am
5th
11.3 16.0 15.3 91 13.8 0.1 1000.3 RS 1.8 1.5 13 SW  Rain am
6th
13.8 16.9 16.4 63 9.4 3.5 1007.5 R 7.4 2.5 22 SW  Rain am
7th
5.7 17.9 17.9 60 10.1 3.8 1015.7 F 0.3 0.3 11 SE  Rain shower eve
8th
12.6 23.2 22.6 62 14.9 4.5 1013.7 FS 0.3 0.3 11 SE  Fog am
9th
13.7 17.1 17.1 79 13.4 0.0 1011.8 FS 0.0 0.9 10 ENE  Cloudy
10th
13.5 20.1 20.0 53 10.1 6.8 1010.4 ST 0.0 1.0 12 ENE  Sunny
11th
10.9 17.8 17.5 45 5.4 7.0 1015.7 FS 0.0 1.7 16 NE  Sunny
12th
8.8 16.8 16.8 56 7.9 4.0 1018.8 FS 0.0 1.2 13 N  Sunny intervals
13th
9.8 13.1 13.1 62 5.9 1.3 1018.4 FS 0.0 2.2 13 N  Cloudy
14th
9.3 12.6 12.6 69 7.0 1.0 1019.5 FS 0.0 1.2 12 N  Cloudy
15th
9.8 12.9 12.9 68 7.1 0.2 1015.6 F 1.0 1.4 13 N  Rain eve
16th
7.3 13.7 13.1 58 5.0 3.8 1018.2 RS 0.3 2.4 17 N  Sunny spells pm
17th
6.5 13.4 12.9 49 2.4 3.0 1023.5 FS 0.0 0.7 10 N  Sunny spells pm
18th
1.8 13.9 13.5 62 6.4 2.0 1017.2 F 0.0 0.9 12 SSW  Sunny intervals
19th
7.8 12.9 11.2 66 5.0 5.3 1007.7 F 3.6 1.9 16 N  Rain pm/eve
20th
2.8 8.8 8.5 44 -3.1 7.2 1018.8 RS 0.0 1.8 17 N  Sunny
21st
-1.2 11.7 11.4 54 2.4 6.2 1021.2 F 0.0 1.3 14 SSW  Sunny periods
22nd
3.1 13.2 12.4 62 5.3 3.3 1015.9 F 0.0 1.3 12 SW  Sunny intervals
23rd
9.4 12.9 11.3 68 5.6 2.5 999.6 FS 5.3 3.1 20 SW  Rain showers
24th
3.1 10.5 10.0 62 3.0 5.8 1014.6 RS 0.5 1.6 14 N  Hail pm
25th
2.6 11.9 11.6 50 1.5 6.2 1027.8 ST 0.0 0.8 11 N  Sunny
26th
0.0  12.3 9.7 86 7.5 0.0 1021.4 F 3.3 2.7 19 SW  Rain pm
27th
12.3 15.1 14.9 84 12.3 1.3 1015.2 FS 0.8 4.3 19 SW  Rain am
28th
10.7 15.4 14.9 73 10.1 1.3 1014.7 FS 0.3 4.0 18 SW  Cloudy
29th
10.7 14.1 13.8 69 8.2 0.2 995.6 FR 3.0 3.7 25 SW  Rain eve
30th
8.3 13.8 13.3 70 7.9 3.7 997.2 FS 2.3 1.5 13 SW  Rain sh. midday
31st
8.9 11.9 11.7 92 10.5 0.8 998.0 RS 3.0 0.2 11 N  Rain am
                         
‡ 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