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JUNE 2010 daily and monthly summary

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JUNE 2010
July
1st - 6th
1st, HP 1018 hPa North Sea and 1021 hPa W of Biscay, developing LP 1014 hPa in SW England moving to the SE, brings light rain from late am through the afternoon. 2nd, early mist clears to give long sunny periods. 3rd, clear skies and unbroken sunshine. 4th, HP 1027 hPa between Iceland/Norway, near unbroken sunshine. 5th, long sunny periods. 6th, LP 1011 hPa developes S England moving eastward, thunderstorm with very heavy rainfall just after midnight, mist am, thunderstorm pm with hail.
7th - 11th
7th, rather cloudy with light rain late evening and heavier shower later. 8th, LP 998 hPa S of Ireland, occluded fronts bring moderate rain intermittently through the night into the morning, rain shower pm. 9th, cloudy with just a few brief sunny intervals. 10th, a dull day with outbraesk of drizzle. 11th, LP 1001 hPa Biscay, LP 1002 hPa N of Netherlands, occluded front gives persistent heavy rain from 05.00 to 08.00 with a maximum of 8.4mm in one hour.
12th - 20th
Situation returns to HP in mid-Atlantic and LP over the near continent giving northerly flow, bright but not especially warm, with cool breeze 14th and 15th. 16th, cloud breaks up midmorning to give sunshine for remainder of day. Developing LP Gulf of Genoa gives exceptionally heavy rainfall in SE France. 17th, HP 1029 hPa NE of Azores extending to 1026 hPa North Sea and 1024 hPa Poland. 19th, some light and brief rain showers pm giving trace of rainfall. 20th, another cloudy day with sunny intervals from late pm.
21st - 30th
21st, a more westerly influence returns, still mainly cloudy. 22nd, HP 1026 hPa near Channel Islands, cloudy spells with sunnier pm. 23rd, long sunny periods. 24th & 25th mainly cloudy but sunny spells too. 26th & 27th, mainly sunny with some high cloud. 28th, HP ridge from Azores 1023 hPa, HP to east and south, LPs to W and NW. 29th, occlusion gives short-lived but heavy rainfall around 9am, sunnier later. 30th, cloudy am, sunnier pm.
JUNE 2010 MONTHLY SUMMARY
ACTUAL TEMPERATURE
 AVERAGE
 Daily Maximum
22.5
  ºC ( + 2.0C )
 Daily Minimum
11.6
  ºC ( + 0.5C )*
 Daily Mean
16.62
  ºC ( + 0.9C )*
 EXTREMES
 High Maximum
30.1
  ºC ( 27th )
 Low Minimum
7.9
  ºC (  3rd )
 Low Maximum
13.4
  ºC (  1st )
 High Minimum
16.7
  ºC ( 30th )
 
   
 Days with max => 25 °C
10
   ( + 6 )*
 Days with max =>15 °C < 25 °C
19
   ( - 6 )*
 Days with max <15 °C
1
   ( ± 0 )*
 
PRECIPITATION
 Monthly Total
37.2
  mm ( 89% )*
 Days with measurable precip
7
  Days ( - 4 )*
   ...of which, days with >= 1.0 mm
6
  Days ( - 2 )*
   ...and days with hail observed
1
  Days  
 
   
 Days with Thunder
1
  Days  
 RAIN RATE & EXTREMES
 High Rain Rate
61.5
  mm/hr (   6th )
 High Rain Total in 1 day
19.3
  mm ( 11th )
 High Rain Total in 1 hour
8.4
  mm ( 11th, 07.30h)
 EVAPO-TRANSPIRATION
 Total for month
103.5
  mm  
 High Total for 1 day
5.1
  mm ( 27th )
APPARENT TEMPERATURE
 Low Wind Chill
7.9
  ºC (  3rd )
 DAVIS HEAT INDICES THW & THSW
 Low Temp/Hum/Wind Index
7.8
  ºC (  3rd )
 High Temp/Hum/Wind Index
28.7
  ºC ( 27th )
 High Temp/Hum/Sun/Wind Index
35.0
  ºC ( 27th )
 
DEWPOINT & HUMIDITY
 High Dewpoint
16.6
  ºC (   6th )
 Low Dewpoint
2.4
  ºC ( 20th )
 Average Dewpoint at 14h
9.9
  ºC  
 Low Relative Humidity
23
  % ( 27th )
 Average RH at 14h
49
  %  
WIND SPEED & DIRECTION
 Monthly Average
1.5
  mph  
 Windiest day (Average)
3.5
  mph ( 19th )
 Highest Gust
21
  mph ( 19th )
 Dominant Direction
N
  ( 27% )
 
BAROMETER
 Monthly Mean
1016.2
  hPa  
 High Barometer
1026.9
  hPa ( 15th )
 Low Barometer
1000.2
  hPa (   8th )
SUNSHINE
 Max Sensor Exposure to direct sun
9.5
  hours/day (15-16 possible)
 Calculated Monthly Sunshine Hours
169.2
  hours  
 Estimated Actual Hours (approx)
215
  hours  
 Sunniest Day Measured
9.3
  hours ( 3rd/4th/28th )
 Days with no sunshine
2
  Days  
 
FOG
 Number of Days with Fog
2
  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 70% 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 JUNE 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
 9.1 13.4 13.3 84 10.7 0.0 1014.2 FS 2.8 0.3 10 SE  Rain
2nd
 8.6 22.8 22.6 41 8.6 8.5 1020.9 ST 0.0 0.7 10 N  Sunny
3rd
 7.9 23.6 23.4 30 4.8 9.3 1021.1 FS 0.0 0.9 12 SW  Sunny
4th
 9.6 27.8 27.7 28 7.5 9.3 1018.8 FS 0.0 0.8 12 SE  Sunny
5th
 10.6 28.1 27.1 39 12.0 7.3 1015.9 FS 0.0 0.8 14 SW  Sunny periods
6th
 15.7 22.8 21.9 61 14.1 4.3 1009.4 ST 7.9 1.1 12 SW  T-storms, mist am
7th
 12.3 19.7 19.0 58 10.5 2.8 1010.1 FS 1.0 1.7 13 SSW  Rain eve
8th
 11.3 19.3 18.9 61 11.2 5.0 1000.3 FS 3.3 2.1 18 SW  Rain am
9th
 12.7 20.7 19.3 66 12.8 1.0 1003.3 ST 0.0 0.4 10 N  Cloudy
10th
 14.5 18.0 17.4 72 12.3 0.0 1005.1 ST 0.3 1.8 17 N  Overcast
11th
 12.8 17.9 13.8 90 12.2 2.0 1009.5 RS 19.3 1.1 13 N  Rain + am
12th
 9.4 20.6 19.7 45 7.4 5.5 1014.9 RS 0.0 1.8 14 N  Sunny spells
13th
 9.2 20.3 19.3 49 8.3 7.0 1013.4 F 0.0 2.1 18 SW  Sunny periods
14th
 9.9 22.6 22.3 41 8.4 7.2 1016.4 RS 0.0 1.7 16 N  Sunny periods
15th
 9.4 18.1 16.8 52 6.9 4.8 1025.8 ST 0.0 2.3 16 N  Sunny spells pm
16th
 10.1 19.1 18.8 49 7.8 8.3 1022.8 FS 0.0 2.4 16 N  Sunny
17th
 10.2 22.8 22.2 47 10.3 7.2 1019.2 FS 0.0 1.5 13 N  Sunny periods
18th
 10.8 21.3 19.8 55 10.5 4.0 1018.2 FS 0.0 1.5 12 N  Sunny intervals
19th
 9.2 15.0 14.6 50 4.3 1.5 1014.8 ST 0.0 3.5 21 N  Cloudy
20th
 8.6 17.3 14.6 52 4.9 2.7 1020.6 RS 0.0 2.7 14 N  Cloudy
21st
 10.6 22.1 21.8 46 9.6 3.2 1021.6 FS 0.0 0.7 10 N  Cloudy
22nd
 9.9 25.8 24.4 41 10.3 8.3 1022.0 FS 0.0 1.1 14 SW  Sunny pm
23rd
 11.1 26.3 25.9 37 10.1 8.8 1020.2 FS 0.0 1.3 12 SSW  Sunny periods
24th
 13.0 25.1 23.9 46 11.6 6.5 1017.6 FS 0.0 1.2 11 SSW  Sunny spells
25th
 15.8 26.0 25.8 43 12.2 4.5 1015.7 FS 0.0 0.9 11 SE  Sunny intervals
26th
 13.6 28.7 28.6 36 12.0 8.7 1015.3 FS 0.0 1.1 12 SE  Sunny periods
27th
 12.7 30.1 29.6 27 8.6 9.2 1016.9 ST 0.0 1.1 11 SW  Sunny
28th
 16.1 28.3 27.8 30 8.6 9.3 1019.0 FS 0.0 1.4 11 SW  Sunny
29th
 15.3 25.7 25.6 54 15.6 5.3 1018.4 ST 2.5 2.1 16 SW  Rain am
30th
 16.7 24.4 24.0 45 11.3 7.7 1017.6 FS 0.0 2.4 18 SW  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