December 2017
A walk along Sandy Bay Beach, Exmouth on a breezy and bright, late December afternoon

Sunnier and wetter than normal with around average temperature
Summary for December 2017
Mean Max: 9.4ºC (+0.1ºC)
Mean Min: 3.2ºC (-0.1ºC)
Mean: 6.3ºC (-0.0ºC)
High Max: 14.1ºC 30th
Low Max: 3.9ºC 9th
High Min: 9.3ºC 25th
Low Min: -3.9ºC 12th
Mean Grass Min: -0.6ºC  
Grass Min: -5.6ºC 9th
Days  >10°C 15 Days  
Days >5°C 30 Days  
Nights  >5°C 10 Days  
Nights  >0°C 24 Days  
Rain Total (gauge): 97.1 mm (108%)
Rain Total (tipping bucket): 82.7 mm (92%)
Rain Days >0.2 mm: 17 Days  
Rain Days >1.0 mm: 12 Days  
Max 24 hrs: 16.3 mm 25th
Days without any rain: 14  
Air Frost: 7 Days  
Grass Frost: 20 Days  
Snow Falling: 0 Days  
Snow (50%) @ 9am: 0 Days  
Ice Days: 0 Days  
Thunder Heard: 2 Days  
Hail <5 mm: 2 Days  
Hail >5 mm: 0 Days  
Fog @ 9am: 0 Days  
Total Monthly Sunshine: 91.4 Hours (113%)
Most Sunshine in a Day: 7.6 Hours 1st
Average Daily Sunshine: 2.9 Hours  
Sunless Days: 5 Days  
Cloudless Days: 6 Days  
Total Possible Sunshine: 249.7 Hours  
Percentage of Total Sun: 37%  
Average Sunny Interval: 19.3 mins
Maximum UV Index: 1.0 3rd 
Mean Soil Temp @ 10 cm: 6.5ºC  
Min Soil Temp @ 10 cm: 5.1ºC 19th
Max Soil Temp @ 10 cm: 8.6ºC 7th
Mean Soil Temp @ 30 cm: 7.1ºC  
Min Soil Temp @ 30 cm: 6.1ºC 17th
Max Soil Temp @ 30 cm: 8.3ºC 7th
Mean Soil Temp @ 100 cm: 9.1ºC  
Min Soil Temp @ 100 cm: 8.3ºC 20th
Max Soil Temp @ 100 cm: 10.6ºC 1st
Ave 10 Min Wind >39 mph: 0.00 Days  
N: 8.68 Days 28%
NE: 0.55 Days 2%
E: 0.14 Days 0%
SE: 0.71 Days 2%
S: 4.28 Days 14%
SW: 1.71 Days 6%
W: 1.81 Days 6%
NW: 5.68 Days 18%
Calm: 7.44 Days 24%
Wind Chill Low: -6.3ºC 12th
Mean Wind: 3.6 mph  
Max Gust: 40 mph 29th
Mean Cloud Cover: 66%  
Mean RH @ 9am: 93%  
Rain >0.1mm/hour: 25.8 Hours  
Frost Duration: 69.1 Hours  
Air Frost in a Day: 16.0 Hours 28th
Mean Sea Temperature: 10.2ºC (-0.1ºC)
Normal for Month: 10.3ºC  
Max Sea Temperature: 11.3ºC 1st
Min Sea Temperature: 9.1ºC 19th
Mean Pressure @ 9am: 1015.1 hPa  
Mean Pressure: 1014.7 hPa  
Max Pressure: 1037.8 hPa 21st
Min Pressure: 975.6 hPa 11th
Max Change in 24 hours: 29.1 hPa 10th
Radiation Daily Mean: 3.38 MJ/m²  
Max Daily Value: 6.78 MJ/m² 1st
Min Daily Value: 1.32 MJ/m² 25th
Number of Days with Data: 31 Days  
1-Hour Maximum: 397 W/m² 8th
Starting Time of the Hour:   13:00
Max Dewpoint: 12.1ºC 7th
Min Dewpoint: -5.0ºC 12th
Mean Dewpoint: 4.3ºC  
Max Humidity: 99% 3rd 
Min Humidity: 60% 8th
Mean Humidity: 89%  
 
 
 
Weather Data for Otter Valley, Devon. December 2017 
  Temp oC Grass Hum (%) Soil oC (cm) Soil DP (oC) Wind (mph) Rain Air (hPa) W/m² UV Sun Frost Sea Observations
  Min Max Min Min Max 10 30 100 (cb) Min Max Max Ave Run mm Min Max Max Max Hours Hours Temp
1 -1.4 7.9 -5.0 68 94 5.2 6.8 10.6 2.4 -3.2 2.6 17 3.9 94 0.0 1016 1028 383 0.9 7.6 4.8 11.1 Sunny all day
2 1.8 8.4 -0.6 86 96 5.5 6.7 10.0 2.6 -0.3 6.9 9 0.9 22 0.0 1027 1029 291 0.9 1.3 0.0 10.8 Sunny intervals all day
3 4.2 10.8 0.0 84 99 6.3 6.8 10.0 2.2 3.3 9.3 15 1.3 32 0.0 1027 1031 381 1.0 0.9 0.0 10.7 Brief sunny intervals all day
4 -0.2 9.1 -1.1 92 99 6.5 7.2 9.6 2.3 -1.0 8.9 7 0.9 22 0.0 1031 1037 113 0.7 0.0 1.3 10.8 Cloudy all day
5 4.9 9.3 2.2 79 98 7.1 7.3 9.4 2.5 4.0 7.5 9 0.6 15 0.0 1034 1038 164 0.8 0.8 0.0 10.6 Brief sunny intervals all day
6 6.9 10.6 5.6 81 95 7.7 7.8 9.4 2.8 5.1 9.7 29 6.9 164 0.9 1019 1034 86 0.7 0.0 0.0 10.7 Cloudy all day
7 7.8 12.6 0.6 73 98 8.6 8.3 9.4 2.6 1.5 12.1 32 9.9 239 3.7 1006 1019 330 1.0 4.4 0.0 10.9 Cloudy am then sunny ints
8 2.2 7.1 -2.8 60 93 7.4 8.2 9.4 2.9 -1.8 2.4 26 4.9 118 0.9 1016 1023 424 0.9 6.7 0.0 11.0 Sunny intervals all day
9 -3.8 3.9 -5.6 82 97 6.1 7.5 9.4 2.6 -4.7 3.0 12 0.5 11 0.0 1006 1022 135 0.7 1.0 12.1 10.7 Brief sunny intervals all day
10 6.1 11.4 -0.6 64 98 6.6 7.2 9.4 3.0 1.5 8.3 37 7.0 168 12.3 977 1006 426 1.0 5.4 0.0 10.6 Sunny intervals all day
11 2.1 5.1 -4.4 70 96 6.4 7.2 9.4 2.5 -3.6 3.8 27 6.3 150 0.7 976 999 291 0.8 3.1 0.0 10.5 Sunny intervals all day
12 -3.9 7.2 -5.6 92 98 5.2 6.5 9.4 2.4 -5.0 6.7 20 1.3 31 0.9 999 1011 227 0.9 3.4 14.1 10.4 Sunny intervals all day
13 5.6 10.4 -1.1 82 98 6.0 6.5 9.4 2.8 2.3 9.0 30 4.1 99 5.9 994 1006 455 0.9 1.2 0.0 10.1 Brief sunny intervals all day
14 4.0 7.4 -1.1 77 96 6.1 6.7 8.9 2.8 1.4 5.0 28 4.3 104 7.0 989 999 479 0.8 3.3 0.0 10.2 Sunny intervals all day
15 2.8 9.0 -2.2 68 95 5.8 6.7 8.9 2.9 0.7 4.6 21 4.9 118 1.5 992 1012 373 0.9 7.4 0.0 10.0 Sunny all day
16 -1.4 7.9 -5.0 74 98 5.1 6.2 8.9 2.8 -2.5 4.8 15 1.3 31 1.3 1012 1024 323 0.9 5.1 7.5 9.9 Sunny am, showers pm
17 1.6 10.6 -1.1 91 99 5.4 6.1 8.9 2.9 0.9 9.8 15 1.4 32 0.0 1021 1025 133 0.7 0.0 0.0 9.8 Cloudy all day
18 0.2 10.7 -2.8 75 99 5.9 6.4 8.9 2.7 -1.3 9.9 16 1.6 37 0.0 1022 1034 309 1.0 7.4 0.0 9.7 Sunny all day
19 -1.9 8.9 -3.3 92 99 5.1 6.1 8.6 2.7 -2.7 7.8 7 1.1 27 0.0 1034 1037 340 0.9 7.4 13.3 9.4 Sunny all day
20 2.4 11.2 -0.6 96 99 5.5 6.1 8.3 2.8 1.4 10.7 6 0.2 6 0.0 1035 1037 138 0.9 0.6 0.0 9.6 Brief sunny intervals all day
21 9.1 11.0 2.8 87 98 6.9 6.6 8.3 3.0 6.2 10.0 11 0.7 16 0.0 1036 1038 94 0.7 0.0 0.0 9.7 Cloudy all day
22 8.6 12.1 5.0 92 98 7.5 7.3 8.3 2.8 7.3 11.1 6 0.4 11 0.4 1034 1037 312 0.8 1.8 0.0 9.8 Brief sunny intervals all day
23 8.1 10.2 5.6 88 98 8.0 7.8 8.3 2.3 7.2 9.3 8 0.7 16 0.0 1032 1038 299 0.8 0.5 0.0 9.7 Brief sunny intervals all day
24 2.2 10.7 -0.6 86 99 8.0 7.8 8.7 2.1 1.4 9.0 17 2.6 62 0.0 1020 1032 132 0.6 0.2 0.0 9.8 Brief sunny intervals all day
25 9.3 11.5 4.4 87 96 8.4 8.2 8.9 2.1 3.8 10.2 34 11.0 265 16.3 995 1020 113 0.7 0.4 0.0 10.0 Brief sunny ints am, rain pm
26 1.7 8.6 -1.1 91 97 7.7 8.1 8.9 2.2 0.3 8.0 33 4.3 102 12.8 979 1000 156 0.6 1.3 0.0 10.1 Sunny intervals am, rain pm
27 2.2 6.4 -3.3 70 98 6.8 7.6 8.9 2.2 -1.4 5.9 29 6.5 156 2.9 978 1002 380 0.8 7.4 0.0 9.8 Sunny all day
28 -3.8 5.8 -5.6 82 98 5.4 6.8 8.9 2.6 -4.6 3.4 5 0.4 10 0.0 1002 1006 317 0.9 7.4 16.0 9.7 Sunny all day
29 3.6 8.7 0.0 75 99 5.4 6.1 8.9 2.7 -0.4 7.4 40 4.4 109 9.0 992 1006 401 0.8 3.4 0.0 9.6 Sunny intervals all day
30 8.9 14.1 5.0 76 98 6.8 6.6 8.6 2.7 6.4 11.9 37 8.2 299 6.2 991 1002 160 0.8 0.0 0.0 9.8 Cloudy all day
31 8.6 13.2 4.4 79 91 8.1 7.6 8.3 2.0 4.4 8.6 25 7.9 83 3.3 992 997 298 0.7 1.7 0.0 10.2 Showers am, sunny ints pm
3.2 9.4 -0.6 81 97 6.5 7.1 9.1 2.6 0.9 7.7 20 3.6 2651 82.7 1009 1020 273 0.8 91.4 69.1 10.2  
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