June 2009

The south Devon coastline near Salcombe on a hot June day.
The south Devon coastline near Salcombe on a hot June day.
Summary for  June 2009
Mean Max: 21.8C (+2.2C)
Mean Min: 11.0C (+0.2C)
Mean: 16.4C (+1.2C)
     
High Max: 28.5C 3rd
Low Max: 14.4C 6th
High Min: 16.1C 26th
Low Min: 5.6C 8th
Mean Grass Min: 8.0C  
Grass Min: 3.1C 8th
     
Rain Total (gauge): 53.9 mm (131%)
Rain Total (tipping bucket): 52.2 mm (127%)
Rain Days >0.2 mm: 7 Days  
Rain Days >1.0 mm: 5 Days  
Max 24 hrs: 38.7  mm 6th
Days without any rain: 23  
     
Air Frost: 0 Days  
Ground Frost: 0 Days  
Snow Falling: 0 Days  
Snow (50%) @ 9am: 0 Days  
Thunder Heard: 5 Days  
Hail <5 mm: 0 Days  
Hail >5 mm: 0 Days  
Fog @ 9am: 0 Days  
     
Total Monthly Sunshine: 220h:47m  
Total Monthly Sunshine: 220.8 Hours  
Most Sunshine in a Day: 15h:37m 2nd
Average Daily Sunshine: 07h:21m  
Sunless Days: 1 Days  
Cloudless Days: 4 Days  
Total Possible Sunshine: 492h:41m  
Percentage of Total Sun: 45%  
     
Mean Soil Temp @ 30 cm: 16.6C  
Min Soil Temp @ 30 cm: 13.8C 7th
Max Soil Temp @ 30 cm: 19.0C 30th
Mean Soil Temp @ 100 cm: 13.9C  
Min Soil Temp @ 100 cm: 13.0C 10th
Max Soil Temp @ 100 cm: 15.3C 29th
     
Mean 10 Min Wind >39 mph: 0.0 Days  
N: 1.84 Days  
NE: 4.07 Days  
E: 5.41 Days  
SE: 6.24 Days  
S: 1.95 Days  
SW: 1.76 Days  
W: 4.84 Days  
NW: 1.07 Days  
Calm: 3.81 Days  
Mean Wind: 3.1 mph  
Max Gust: 22 mph 6th
     
Mean Cloud Cover: 58%  
Mean RH @ 9am: 80%  
Rain Duration >0.1mm/hour: 18.0 Hours  
Frost Duration: 0.0 Hours  
Max Frost Duration in a Day: 0.0 Hours 32th
     
Mean Sea Temperature: 15.8C  
Normal for Month:    
Max Sea Temperature: 18.3C 3rd
Min Sea Temperature: 14.5C 8th
     
Mean Pressure @ 9am: 1017.2 hPa (-0.2 hPa)
Mean Pressure: 1016.9 hPa (-0.5 hPa)
Max Pressure: 1028.4 hPa 23rd
Min Pressure: 997.0 hPa 7th
     
Max Dewpoint: 17.8C 30th
Min Dewpoint: 2.4C 8th
Mean Dewpoint: 10.0C  
     
Max Humidity: 91% 7th
Min Humidity: 35% 2nd
Mean Humidity: 70% (-6)

 

A warm and generally sunny month with a hot start and end. Warmer than 2005, 2007 and 2008, and only slightly cooler than 2006 (mean 16.7C).

As would be expected, the warmth followed the sunshine with a short, cool spell from the 6th to the 8th. Otherwise, daytime temperatures have been consistently high with only 5 days failing to exceed the LTA. This month had 20 days with a temperature greater than 20C, the highest since 2006 (21 days).

Overall rainfall was above the LTA but 38.7 mm of the 53.9 mm total fell in just one afternoon on the 6th. Just 15.2 mm fell during the following 23 days, all from thunderstorms. Conditions at the end of the month were very dry.
Quite a thundery month though none of the storms were severe and gave only small amounts of rain.
The month started sunny with 65 hours of sunshine during the first week (1st - 7th) alone. Sunshine levels were then a little lower, but still reasonable during the 2nd and 3rd weeks before climbing again in the 4th week with 59 hours (24th - 30th). This month did not end up as sunny as June 2008 (233 hours) but was much sunnier than 2007 (157 hours).
Soil temperatures were generally above normal throughout. 30 cm soil temperatures reached 19.0C on the 30th, higher than anything recorded during the summers of 2007 & 2008.
Winds were dominant from the east and south-east directions.
Rainfall duration for the whole month was only 18.0 hours and reflected the dry 'nature' of this month despite the above average rainfall.
Sea temperatures gradually rose throughout the month and ended up rather above normal.
Mean pressure was just 0.5 hPa below normal.
Dewpoints were significantly low during the middle of the month but soon rose, and were quite high at times.
The very dry air at the beginning and middle of the month was replaced by much more humid conditions at the end.
Weather Data for Otter Valley, Devon.  June 2009  
  Temp (oC) Hum (RH%) Dewpoint (oC) Wind (mph) Rain Pressure (hPa) Grass Sun  
  Min Max Ave Min Max Ave Min Max Ave Max Ave Run mm Min Max Ave Min Hours Observations
1 13.3 27.4 20.4 41 81 61 9.4 15.2 12.3 18 3.9 94 0.0 1024 1025 1024 9.6 14.9 Sunny all day
2 11.6 27.8 19.7 35 71 53 4.8 12.2 8.5 16 3.1 73 0.0 1024 1027 1025 7.2 15.6 Sunny all day
3 10.3 28.5 19.4 46 85 66 5.9 15.3 10.6 13 1.2 28 0.0 1019 1024 1021 6.8 9.2 Sunny am, sunny ints pm
4 12.7 18.6 15.7 63 80 72 6.7 11.9 9.3 14 3.1 74 0.0 1016 1020 1018 6.5 6.0 Cloudy am, sunny ints pm
5 6.9 20.7 13.8 42 87 65 3.5 8.5 6.0 13 1.8 44 0.0 1005 1016 1010 4.1 5.9 Sunny ints am, cloudy pm
6 8.9 14.4 11.7 58 89 74 5.1 9.3 7.2 22 2.6 55 25.8 997 1005 1001 8.2 0.2 Cloudy am, heavy rain pm
7 6.0 16.4 11.2 56 91 74 3.9 7.7 5.8 14 3.2 61 10.8 997 1003 1000 3.6 12.8 Sunny intervals all day
8 5.6 15.9 10.8 64 88 76 2.4 9.6 6.0 19 4.1 99 0.0 1003 1005 1004 3.1 2.7 Sunny intervals all day
9 10.9 20.4 15.7 49 84 67 7.3 10.6 9.0 15 3.4 82 0.0 1003 1010 1007 8.7 4.5 Cloudy am, sunny ints pm
10 9.7 19.1 14.4 61 87 74 6.2 11.9 9.1 18 2.9 69 2.4 1008 1011 1010 5.7 5.9 Sunny am, showers pm
11 7.8 20.9 14.4 48 90 69 5.2 11.4 8.3 21 4.7 112 0.0 1010 1021 1015 4.9 11.8 Sunny intervals all day
12 10.8 15.6 13.2 63 89 76 5.9 12.6 9.3 14 2.9 69 0.0 1020 1022 1021 8.7 0.0 Cloudy am, misty pm
13 13.3 20.9 17.1 63 91 77 10.5 13.1 11.8 16 3.5 85 0.0 1018 1020 1019 10.4 5.1 Sunny intervals all day
14 9.6 23.3 16.5 44 90 67 7.1 12.6 9.9 15 2.2 52 0.0 1018 1020 1019 6.3 7.9 Sunny intervals all day
15 10.7 19.3 15.0 63 88 76 7.6 13.0 10.3 18 1.5 37 8.2 1016 1019 1017 8.6 7.8 Sunny ints, thunderstorm pm
16 8.6 21.3 15.0 57 90 74 5.9 12.7 9.3 17 2.5 60 0.0 1017 1024 1020 5.6 10.7 Misty early am, then sunny
17 11.7 18.4 15.1 66 90 78 9.3 13.6 11.5 20 4.3 102 3.0 1014 1023 1019 8.7 2.6 Sunny early & late, rain pm
18 8.1 19.4 13.8 51 91 71 5.7 10.7 8.2 20 4.1 99 0.0 1016 1020 1018 5.9 4.3 Sunny intervals all day
19 7.8 19.8 13.8 51 89 70 4.8 10.3 7.6 21 5.4 129 0.0 1019 1025 1022 5.3 8.4 Sunny intervals all day
20 10.7 21.3 16.0 53 86 70 7.0 11.9 9.5 20 4.6 109 0.0 1025 1026 1025 8.2 8.5 Sunny intervals all day
21 10.9 24.6 17.8 51 88 70 7.5 13.1 10.3 16 3.7 88 0.0 1025 1026 1026 7.4 4.9 Sunny intervals all day
22 14.1 23.7 18.9 61 87 74 10.6 15.5 13.1 11 1.8 43 0.0 1026 1028 1027 11.5 4.7 Sunny intervals all day
23 12.8 23.7 18.3 45 88 67 7.8 13.8 10.8 15 1.9 45 0.0 1025 1028 1027 9.3 7.9 Cloudy am, sunny pm
24 10.9 24.7 17.8 47 76 62 5.9 13.2 9.6 18 3.6 87 0.0 1016 1025 1021 6.8 14.3 Sunny all day
25 12.8 25.7 19.3 56 80 68 7.6 16.3 12.0 19 4.1 98 0.0 1011 1016 1014 9.8 5.4 Sunny intervals all day
26 16.1 24.7 20.4 58 86 72 11.8 15.7 13.8 13 2.2 54 1.0 1011 1013 1012 12.5 8.1 Sunny intervals all day
27 13.3 23.7 18.5 58 90 74 9.9 14.8 12.4 15 2.5 60 0.0 1013 1016 1015 10.3 11.1 Misty am then sunny all day
28 11.4 22.9 17.2 62 87 75 8.0 15.2 11.6 11 1.7 40 0.0 1015 1016 1015 9.1 1.1 Brief sunny intervals all day
29 15.9 24.7 20.3 49 85 67 11.0 17.1 14.1 20 3.9 95 1.0 1015 1018 1016 12.8 12.9 Sunny all day
30 16.1 26.1 21.1 63 78 71 10.6 17.8 14.2 16 3.1 74 0.0 1018 1022 1020 13.9 5.8 Sunny intervals all day
11.0 21.8 16.4 54 86 70 7.2 12.9 10.0 17 3.1 2214 52.2 1015 1019 1017 8.0 220.83  

Graphs for June 2009

Figure 1. Temperature and Rainfall for June 2009.
Figure 2. Sunshine, air pressure and mean wind speed for June 2009.
Figure 3. Wind direction for June 2009.
Figure 4. Soil & sea surface temperature (SST) for Lyme Bay for June 2009.
Figure 5. Wind run, maximum gusts and mean pressure for June 2009.