May 2015
Beautiful bluebells in an Otter Valley woodland, at their best in mid-May

Average temperatures though wetter and with less sunshine than normal.
Summary for  May 2015
Mean Max: 16.9ºC (+0.3ºC)
Mean Min: 7.8ºC (-0.4ºC)
Mean (min+max ÷ 2): 12.4ºC (-0.0ºC)
Mean (integrated):  12.1ºC  
High Max: 21.8ºC 23rd 
Low Max: 10.3ºC 2nd 
High Min: 12.3ºC 31st
Low Min: 2.3ºC 20th
Mean Grass Min: 5.7ºC  
Grass Min: 0.4ºC 20th
Days  >20°C 3 Days  
Days <15°C 6 Days  
Days  <10°C 0 Days  
Nights  <5°C 4 Days  
Rain Total (gauge): 78.1 mm (140%)
Rain Total (tipping bucket): 67.8 mm (121%)
Rain Days >0.2 mm: 13 Days  
Rain Days >1.0 mm: 11 Days  
Max 24 hrs: 20.0 mm 14th
Days without any rain: 18  
Air Frost: 0 Days  
Grass Frost: 0 Days  
Snow Falling: 0 Days  
Snow (50%) @ 9am: 0 Days  
Ice Days: 0 Days  
Thunder Heard: 0 Days  
Hail <5 mm: 0 Days  
Hail >5 mm: 0 Days  
Fog @ 9am: 1 Days  
Total Monthly Sunshine: 177.0 Hours (93%)
Most Sunshine in a Day: 12.9 Hours 13th
Average Daily Sunshine: 5.7 Hours  
Sunless Days: 2 Days  
Cloudless Days: 1 Day 13th 
Total Possible Sunshine: 429.4 Hours  
Percentage of Total Sun: 41%  
Maximum UV Index: 8.2 22nd 
Time of Max UV:    
Average Max UV: 6.0  
Mean Soil Temp @ 30 cm: 14.8ºC  
Min Soil Temp @ 30 cm: 13.1ºC 2nd 
Max Soil Temp @ 30 cm: 16.3ºC 29th
Mean Soil Temp @ 100 cm: 14.2ºC  
Min Soil Temp @ 100 cm: 13.3ºC 1st
Max Soil Temp @ 100 cm: 15.4ºC 30th
Ave 10 Min Wind >39 mph: 0.00 Days  
N: 3.15 Days  
NE: 0.52 Days  
E: 2.24 Days  
SE: 2.94 Days  
S: 6.07 Days  
SW: 2.85 Days  
W: 2.46 Days  
NW: 6.93 Days  
Calm: 3.84 Days  
Wind Chill Low: 2.1ºC 20th
Mean Wind: 4.8 mph  
Max Gust: 36 mph 5th
Mean Cloud Cover: 57%  
Mean RH @ 9am: 88%  
Rain >0.1mm/hour: 14.6 Hours  
Frost Duration: 0.0 Hours  
Air Frost in a Day: 0.0 Hours 1st
Mean Sea Temperature: 12.3ºC (-0.4ºC)
Normal for Month: 12.7ºC  
Max Sea Temperature: 13.1ºC 27th
Min Sea Temperature: 11.2ºC 2nd 
Mean Pressure @ 9am: 1014.7 hPa  
Mean Pressure: 1014.8 hPa  
Max Pressure: 1029.7 hPa 17th
Min Pressure: 985.2 hPa 5th
Max Change in 24 hours: 15.5 hPa 18th
Radiation Daily Mean: 17.12 MJ/m²  
Max Daily Value: 26.34 MJ/m² 12th
Min Daily Value: 3.14 MJ/m² 2nd 
Number of Days with Data: 31 Days  
1-Hour Maximum: 1320 W/m² 4th
Starting Time of the Hour:   13:00
Max Dewpoint: 15.6ºC 3rd 
Min Dewpoint: 1.3ºC 20th
Mean Dewpoint: 8.8ºC  
Max Humidity: 99% 3rd 
Min Humidity: 45% 16th
Mean Humidity: 79%  
Weather Data for Otter Valley, Devon. May 2015
  Temp oC Grass Hum (%) Soil oC DP (oC) Wind (mph) Rain Air (hPa) W/m² UV Sun Frost Calm Wind Sea Observations
  Min Max Min Min Max 30 100 Min Max Max Ave Run mm Min Max Max Max Hours Hours Hours Chill Temp
1 6.5 12.7 6.9 67 88 13.2 13.3 3.7 7.5 17 3.4 82 0.0 1007 1010 496 3.4 0.0 0.0 3.1 6.3 11.3 Cloudy all day
2 9.3 10.3 8.9 80 97 13.1 13.4 6.0 9.8 26 7.3 174 5.4 1001 1010 141 1.3 0.0 0.0 0.3 6.4 11.2 Patchy rain & drizzle all day
3 10.3 18.2 1.8 75 99 13.2 13.4 9.8 15.6 26 9.1 219 7.4 993 1000 1144 6.7 3.3 0.0 0.0 7.7 11.4 Sunny ints & showers all day
4 5.1 14.9 5.1 81 99 13.6 13.4 4.2 12.2 23 5.1 123 6.2 993 1004 1320 6.9 3.9 0.0 3.8 4.9 11.9 Sunny ints am, light rain pm
5 10.4 13.7 7.7 71 98 13.7 13.4 7.1 11.9 36 10.8 259 11.6 985 1000 976 4.4 1.6 0.0 0.0 6.8 11.7 Sun and showers, windy
6 8.5 15.7 6.5 61 93 13.5 13.5 7.0 9.8 31 9.8 236 2.4 1000 1011 1085 6.4 2.4 0.0 0.0 5.4 11.8 Sunshine and light showers
7 5.4 16.1 2.6 61 98 13.6 13.5 4.2 10.9 22 5.4 130 0.0 1011 1017 1045 7.3 8.4 0.0 3.4 5.2 11.6 Sunny intervals all day
8 8.8 15.3 8.5 79 97 13.8 13.6 6.8 12.4 21 5.0 120 1.6 1009 1016 995 6.2 0.5 0.0 4.6 6.9 11.5 Cloudy am, sunny ints pm
9 9.4 19.1 5.6 56 95 14.0 13.6 7.8 11.7 17 4.6 109 2.0 1010 1021 1290 6.8 4.7 0.0 1.0 8.0 11.8 Sunny intervals all day
10 8.7 15.7 11.1 83 98 14.2 13.7 7.8 13.5 24 5.6 135 0.0 1019 1023 682 6.1 0.6 0.0 2.6 7.8 11.9 Brief sunny intervals all day
11 11.5 19.7 8.9 64 96 14.5 13.8 9.8 15.5 20 5.7 136 0.0 1017 1019 952 6.1 6.6 0.0 0.0 10.9 12.2 Sunny intervals all day
12 10.3 18.6 7.0 49 95 14.7 13.7 6.8 10.4 20 4.1 100 0.0 1017 1023 1175 6.8 10.4 0.0 2.3 9.1 12.3 Sunny intervals all day
13 2.9 18.3 1.5 51 98 15.0 14.0 1.8 11.5 13 2.7 65 0.0 1015 1023 1076 7.4 12.9 0.0 6.0 2.3 12.8 Rain am, brief sunny ints pm
14 9.6 12.9 7.6 78 97 15.0 14.2 7.5 10.8 23 3.5 84 20.0 1006 1015 467 7.6 0.8 0.0 5.9 7.8 12.4 Rain am, sunny intervals pm
15 8.5 16.1 7.4 75 95 14.9 14.3 6.9 12.3 13 3.0 72 0.0 1013 1023 1074 7.6 5.7 0.0 2.2 7.1 12.6 Sunny am, cloudy pm
16 9.1 17.3 2.4 45 94 15.3 14.3 5.0 11.9 21 5.0 119 0.0 1022 1030 1031 6.5 10.8 0.0 1.7 8.9 12.7 Cloudy am, sunny pm
17 4.1 16.4 4.3 56 98 15.3 14.4 3.1 10.7 14 2.7 65 0.0 1020 1030 953 7.6 4.5 0.0 4.8 3.8 12.6 Sunny intervals all day
18 8.4 16.2 4.8 50 97 15.2 14.4 5.1 11.8 26 7.3 176 1.6 1005 1020 1140 7.3 5.3 0.0 0.3 6.8 12.5 Rain am, sunny intervals pm
19 7.2 14.9 1.6 55 90 15.2 14.5 4.9 8.6 26 5.4 129 0.8 1005 1012 1147 6.3 10.5 0.0 0.0 5.4 12.4 Sunshine & showers
20 2.3 16.3 0.4 51 98 14.8 14.5 1.3 8.0 21 3.5 84 0.4 1012 1025 1137 6.7 10.3 0.0 7.6 2.1 12.4 Sunny intervals all day
21 6.2 19.2 3.7 56 98 14.9 14.6 4.6 13.3 17 3.1 74 0.0 1025 1029 1101 7.0 12.7 0.0 4.4 5.9 12.6 Sunny intervals all day
22 8.1 20.9 10.0 63 94 15.4 14.6 6.2 14.9 17 2.6 63 0.0 1024 1029 1272 8.2 2.5 0.0 9.3 7.9 12.8 Brief sunny intervals all day
23 11.1 21.8 6.4 58 96 15.9 14.7 9.9 14.5 14 2.0 47 0.0 1022 1025 1076 7.3 6.9 0.0 3.1 10.8 13.0 Brief sunny ints all day
24 8.1 17.6 11.4 79 97 15.8 14.9 6.9 14.9 13 2.2 52 0.0 1019 1023 376 2.9 2.0 0.0 4.2 7.8 12.8 Cloudy am, sunny ints pm
25 7.2 19.9 5.2 59 97 15.8 14.9 6.1 12.5 18 3.4 81 0.0 1019 1021 1195 0.0 4.9 0.0 6.7 6.9 12.9 Sunny intervals all day
26 6.0 21.2 4.3 55 98 15.9 14.9 5.2 13.0 15 2.6 62 0.0 1021 1026 1136 7.5 8.9 0.0 4.7 5.8 12.8 Sunny intervals all day
27 5.1 18.4 3.5 59 97 16.3 15.1 4.1 14.0 16 3.2 78 0.0 1018 1027 1023 7.3 10.4 0.0 3.0 4.8 13.1 Brief sunny ints all day
28 10.9 18.5 8.3 48 88 16.3 15.0 4.8 10.7 17 3.8 90 0.0 1015 1018 1120 0.0 6.8 0.0 0.6 10.1 13.0 Brief sunny ints all day
29 7.1 15.7 1.8 54 91 16.3 15.2 4.9 11.6 23 4.8 120 2.2 1007 1015 1196 6.8 6.4 0.0 3.8 6.9 12.7 Brief sunny ints all day
30 4.1 17.3 4.6 65 97 16.0 15.4 3.2 11.9 21 4.7 112 0.0 1010 1015 1027 6.9 8.2 0.0 7.2 2.2 12.8 Sunny ints am, cloudy pm
31 12.3 15.4 6.8 48 98 16.2 15.3 4.1 13.4 26 6.7 154 3.2 1004 1014 924 7.7 4.1 0.0 0.3 9.0 12.7 Light rain am, sunny ints pm
7.8 16.9 5.7 62 96 14.9 14.2 5.7 12.0 21 4.8 3552 61.6 1011 1019 993 6.0 177.0 0.0 96 6.7 12.3  
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