April 2013
The wide expanse of Dartmoor near Belstone taken on a bright and breezy April day.
Overall this was a dry, cool month with average sunshine though slightly warmer, sunnier and much drier than 2012.

Summary for April 2013
Mean Max: 12.7ºC (-0.5ºC)
Mean Min: 4.0ºC (-1.0ºC)
Mean: 8.4ºC (-0.7ºC)
     
High Max: 18.6ºC 23rd 
Low Max: 5.3ºC 4th
High Min: 10.1ºC 14th
Low Min: -2.4ºC 6th
Mean Grass Min: 1.9ºC  
Grass Min: -4.8ºC 6th
     
Rain Total (gauge): 34.5 mm (57%)
Rain Total (tipping bucket): 33.6 mm (55%)
Rain Days >0.2 mm: 13 Days  
Rain Days >1.0 mm: 8 Days  
Max 24 hrs: 7.6 mm 10th
Days without any rain: 17  
     
Air Frost: 3 Days  
Grass Frost: 12 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: 2 Days  
     
Total Monthly Sunshine: 168.6 Hours (101%)
Most Sunshine in a Day: 13.6 Hours 30th
Average Daily Sunshine: 5.6 Hours  
Sunless Days: 0 Days  
Cloudless Days: 4 Days  
Total Possible Sunshine: 416 Hours  
Percentage of Total Sun: 41%  
Maximum UV Index: 7.9 23rd 
Time of Max UV:   13:15
     
Mean Soil Temp @ 30 cm: 9.7ºC  
Min Soil Temp @ 30 cm: 6.5ºC 5th
Max Soil Temp @ 30 cm: 12.4ºC 26th
Mean Soil Temp @ 100 cm: 9.7ºC  
Min Soil Temp @ 100 cm: 8.3ºC 1st
Max Soil Temp @ 100 cm: 11.4ºC 28th
     
Ave 10 Min Wind >39 mph: 0.01 Days  
N: 7.62 Days  
NE: 2.14 Days  
E: 3.59 Days  
SE: 1.97 Days  
S: 5.11 Days  
SW: 1.83 Days  
W: 0.82 Days  
NW: 4.13 Days  
Calm: 3.78 Days  
Wind Chill Low: -3.2ºC 4th
Mean Wind: 4.1 mph  
Max Gust: 30 mph 14th
  31.00 Days  
Mean Cloud Cover: 63%  
Mean RH @ 9am: 86%  
Rain >0.1mm/hour: 26.0 Hours  
Frost Duration: 13.3 Hours  
Air Frost in a Day: 6.8 Hours 7th
     
Mean Sea Temperature: 7.9ºC (-2.5ºC)
Normal for Month: 10.4ºC  
Max Sea Temperature: 11.4ºC 23rd 
Min Sea Temperature: 6.1ºC 4th
     
Mean Pressure @ 9am: 1015.2 hPa (+0.6 hPa)
Mean Pressure: 1014.7 hPa (+0.1 hPa)
Max Pressure: 1033.5 hPa 20th
Min Pressure: 990.4 hPa 12th
Max Change in 24 hours: 16.0 hPa 12th
     
Radiation Daily Mean: 13.7 MJ/m²  
Max Daily Value: 27.3 MJ/m² 30th
Min Daily Value: 0.0 MJ/m² 15th
Number of Days with Data: 31 Days  
1-Hour Maximum: 1045 W/m² 18th
Starting Time of the Hour:   12:45
     
Max Dewpoint: 13.0ºC 24th
Min Dewpoint: -5.2ºC 3rd 
Mean Dewpoint: 4.5ºC  
     
Max Humidity: 99% 13th
Min Humidity: 40% 30th
Mean Humidity: 78% (+78)
Weather Data for Otter Valley, Devon. April 2013
  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 2.1 5.8 -0.6 57 77 6.9 8.3 -3.2 -0.8 19 3.6 86 0.0 1008 1011 301 1.7 0.4 0.0 0.0 0.4 6.2 Cloudy all day
2 0.3 10.7 -3.3 43 81 6.7 8.4 -3.9 1.7 15 3.0 71 0.0 1010 1016 879 3.1 11.7 0.0 0.0 -1.3 6.3 Long sunny intervals all day
3 0.2 10.4 -4.0 42 81 6.7 8.4 -5.2 0.3 20 3.5 85 0.0 1015 1018 899 3.2 12.3 0.0 1.5 -2.9 6.2 Sunny all day
4 0.3 5.3 -2.7 52 83 6.7 8.4 -5.0 -0.2 22 5.2 126 0.0 1014 1017 381 2.0 0.2 0.0 0.0 -3.2 6.1 Brief sunny intervals all day
5 0.8 10.8 -2.0 44 81 6.5 8.3 -3.2 -0.1 23 6.0 145 0.0 1014 1019 831 3.3 8.7 0.0 0.0 -2.2 6.2 Long sunny intervals all day
6 -2.4 12.9 -4.8 42 93 6.9 8.4 -4.2 1.8 12 2.2 52 0.0 1020 1026 909 4.1 12.3 4.5 2.0 -2.6 6.9 Sunny all day
7 -1.7 9.6 -3.3 63 97 7.4 8.5 -2.7 3.9 18 3.4 83 0.0 1012 1025 720 3.5 5.0 6.8 4.8 -2.3 6.4 Sunny ints am, cloudy pm
8 4.8 6.8 2.9 79 92 7.7 8.6 1.8 5.2 19 3.9 95 2.5 999 1011 227 1.5 0.6 0.0 0.0 3.2 6.4 Rain am & pm, fine evening
9 5.0 8.3 -0.4 87 95 7.9 8.7 3.6 6.7 19 3.4 82 5.8 992 999 198 1.4 0.0 0.0 0.3 3.4 6.5 Intermittent light rain all day
10 1.7 9.4 4.1 86 98 8.3 8.8 1.0 7.9 19 2.1 51 7.6 995 1005 509 2.5 3.1 0.0 9.8 1.6 6.6 Sunny intervals am, rain pm
11 6.1 14.3 3.0 81 98 9.0 8.8 5.4 11.5 21 4.0 96 2.1 994 998 876 4.2 4.6 0.0 3.0 5.4 7.2 Sunny intervals & showers
12 6.4 13.8 0.1 61 98 9.3 9.1 5.4 8.7 20 4.4 105 4.8 990 1006 721 4.3 4.7 0.0 3.0 5.7 7.3 Sunny intervals all day
13 2.1 11.2 9.6 78 99 9.4 9.3 1.2 11.0 27 3.8 92 5.3 1007 1010 142 1.1 0.0 0.0 8.8 1.8 7.0 Drizzle & patchy rain all day
14 10.1 13.0 7.4 87 99 9.8 9.4 8.9 11.2 30 7.6 141 0.0 1009 1011 294 2.6 1.7 0.0 0.0 7.0 7.3 Brief sunny intervals
15 9.2 14.0 7.1 94 94 10.2 9.5 9.1 9.1 12 5.0 10 0.0 1016 1016 4 0.0 2.2 0.0 0.0 9.0 8.1 Sunny intervals all day
16 9.4 17.6 8.3 52 98 10.4 9.5 7.4 10.1 24 7.1 187 0.9 1012 1018 804 5.2 5.1 0.0 0.0 6.2 8.4 Sunny intervals all day
17 9.4 13.7 8.0 83 98 11.0 9.8 8.5 11.5 27 7.5 179 0.5 1009 1018 601 4.7 0.5 0.0 0.0 7.1 8.4 Brief sunny intervals
18 8.7 14.7 4.4 52 83 11.0 9.9 3.0 9.3 26 7.9 189 0.7 1010 1021 1045 4.9 7.0 0.0 0.0 5.9 8.4 Sunny intervals all day
19 7.9 16.7 0.6 42 87 11.1 10.1 2.9 6.1 16 4.6 111 0.0 1021 1031 950 4.7 10.3 0.0 0.0 6.5 8.9 Long sunny intervals all day
20 0.9 13.6 -0.9 62 96 11.3 10.4 0.0 8.6 14 2.5 65 0.0 1029 1034 981 5.0 13.4 0.0 4.3 0.2 8.9 Sunny all day
21 -0.3 11.4 3.3 78 98 11.0 10.6 -1.1 8.3 16 2.6 64 1.2 1017 1028 832 2.9 3.9 2.0 8.0 -0.5 8.7 Sunny intervals am, rain pm
22 2.6 12.3 0.6 85 99 10.9 10.7 2.0 10.1 18 3.1 75 0.2 1015 1018 341 4.2 0.0 0.0 8.8 2.6 8.8 Patchy light drizzle all day
23 5.6 18.6 2.8 65 98 11.1 10.7 4.8 12.8 17 3.1 75 0.0 1016 1024 919 7.9 10.4 0.0 4.0 5.5 11.4 Long sunny intervals all day
24 9.1 16.7 7.1 77 95 11.9 10.8 8.0 13.0 13 2.6 57 0.0 1023 1025 754 7.4 0.8 0.0 6.0 9.0 9.8 Sunny intervals all day
25 8.6 16.8 8.4 69 98 12.4 11.0 8.1 12.4 13 2.7 64 0.0 1019 1025 815 6.4 2.8 0.0 4.5 7.3 10.0 Sunny intervals all day
26 5.9 13.7 2.4 45 96 12.4 11.0 0.8 9.6 21 4.7 113 1.6 1016 1019 955 5.0 10.1 0.0 2.3 5.8 9.1 Long sunny intervals all day
27 0.9 13.8 -0.5 44 97 12.1 11.2 0.0 4.1 20 3.8 90 0.0 1014 1019 957 4.5 9.6 0.0 5.3 0.9 8.8 Long sunny intervals all day
28 1.9 12.2 -0.5 54 95 11.9 11.4 0.7 6.1 22 3.6 87 0.0 1014 1020 537 3.3 1.2 0.0 7.0 1.5 8.9 Brief sunny intervals
29 4.1 15.8 1.4 44 95 11.7 11.4 2.6 7.5 19 3.6 87 0.5 1014 1022 1031 6.0 12.4 0.0 4.3 4.1 9.2 Long sunny intervals all day
30 1.4 17.5 -0.6 40 96 11.8 11.3 0.6 5.7 18 2.8 68 0.0 1022 1025 990 5.5 13.6 0.0 2.0 0.9 9.5 Sunny all day
4.0 12.7 1.9 63 93 10 9.7 1.9 7.1 19 4.1 2828 34 1011 1018 680 3.9 169 13 89 2.9 7.9  
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