January 2018
A January walk along Jacob's Ladder, Sidmouth with its deep-red Triassic sandstone cliffs and beach sand

Warmer than normal with around average rainfall and just a little below my long term average for sunshine. Overall, a generally mild and pleasant month.

Summary for January 2018
Mean Max: 10.5C (+1.6C)
Mean Min: 3.7C (+0.6C)
Mean (min+max 2): 7.1C (+1.1C)
Mean (integrated):  6.9C  
High Max: 14.0C 23rd 
Low Max: 4.3C 8th
High Min: 10.7C 28th
Low Min: -2.4C 30th
Mean Grass Min: 0.3C  
Grass Min: -4.4C 6th
Days  >10C 18 Days  
Days >5C 30 Days  
Nights  >10C 2 Days  
Nights  >5C 11 Days  
Rain Total (gauge): 82.7 mm (101%)
Rain Total (tipping bucket): 78.7 mm (96%)
Rain Days >0.2 mm: 20 Days  
Rain Days >1.0 mm: 15 Days  
Max 24 hrs: 9.8 mm 16th
Days without any rain: 11  
Air Frost: 6 Days  
Grass Frost: 16 Days  
Snow Falling: 0 Days  
Snow (50%) @ 9am: 0 Days  
Ice Days: 0 Days  
Thunder Heard: 1 Day  
Hail <5 mm: 4 Days  
Hail >5 mm: 0 Days  
Fog @ 9am: 2 Days  
Total Monthly Sunshine: 77.4 Hours (97%)
Most Sunshine in a Day: 7.2 Hours 7th
Average Daily Sunshine: 2.5 Hours  
Sunless Days: 6 Days  
Cloudless Days: 2 Days  
Total Possible Sunshine: 265.3 Hours  
Percentage of Total Sun: 29%  
Average Sunny Interval: 15.9 mins
Maximum UV Index: 1.1 23rd 
Mean Soil Temp @ 10 cm: 6.8C  
Min Soil Temp @ 10 cm: 4.9C 12th
Max Soil Temp @ 10 cm: 8.6C 24th
Mean Soil Temp @ 30 cm: 7.1C  
Min Soil Temp @ 30 cm: 5.8C 12th
Max Soil Temp @ 30 cm: 8.1C 24th
Mean Soil Temp @ 100 cm: 8.3C  
Min Soil Temp @ 100 cm: 7.8C 14th
Max Soil Temp @ 100 cm: 8.9C 3rd 
Ave 10 Min Wind >39 mph: 0.00 Days  
N: 3.80 Days 12%
NE: 1.20 Days 4%
E: 1.09 Days 4%
SE: 1.84 Days 6%
S: 4.83 Days 16%
SW: 3.50 Days 11%
W: 5.19 Days 17%
NW: 3.93 Days 13%
Calm: 5.63 Days 18%
Wind Chill Low: -3.6C 12th
Mean Wind: 3.5 mph  
Max Gust: 46 mph 24th
Mean Cloud Cover: 66%  
Mean RH @ 9am: 92%  
Rain >0.1mm/hour: 6.9 Hours  
Frost Duration: 35.9 Hours  
Air Frost in a Day: 13.3 Hours 12th
Mean Sea Temperature: 9.4C (+0.5C)
Normal for Month: 8.9C  
Max Sea Temperature: 11.3C 4th
Min Sea Temperature: 9.1C 19th
Mean Pressure @ 9am: 1011.1 hPa  
Mean Pressure: 1010.9 hPa  
Max Pressure: 1033.6 hPa 28th
Min Pressure: 992.4 hPa 5th
Max Change in 24 hours: 25.3 hPa 30th
Radiation Daily Mean: 3.20 MJ/m  
Max Daily Value: 5.99 MJ/m 5th
Min Daily Value: 0.81 MJ/m 8th
Number of Days with Data: 31 Days  
1-Hour Maximum: 434 W/m 25th
Starting Time of the Hour:   13:00
Max Dewpoint: 12.6C 4th
Min Dewpoint: -3.1C 30th
Mean Dewpoint: 5.1C  
Max Humidity: 99% 4th
Min Humidity: 65% 25th
Mean Humidity: 87%  
 
 
 
Weather Data for Otter Valley, Devon. January 2018 
  Temp oC Grass Hum (%) Soil oC (cm) Soil DP (oC) Wind (mph) Rain Air (hPa) W/m 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 4.7 9.6 1.1 76 95 7.4 7.8 8.3 2.8 2.9 7.0 25 5.0 120 4.1 995 1010 376 0.8 3.1 0.0 10.2 Sunny intervals all day
2 3.4 12.6 0.0 83 98 7.2 7.5 8.7 2.1 2.0 11.7 26 2.3 55 0.5 994 1013 132 0.6 0.2 0.0 10.2 Sunny ints am, cloudy pm
3 6.1 13.1 3.9 69 95 7.8 7.8 8.9 2.8 3.8 12.2 24 0.0 0 6.7 993 1006 381 1.0 0.9 0.0 10.2 Sunshine and showers
4 7.6 13.0 4.4 71 99 8.0 7.8 8.9 2.5 5.0 12.6 22 0.0 0 9.6 993 1004 227 0.9 3.4 0.0 10.3 Sunny intervals all day
5 1.3 9.9 -1.7 70 95 7.4 7.8 8.9 2.6 0.5 6.5 7 0.1 3 4.3 992 997 424 0.9 6.1 0.0 10.3 Sunny am, showers pm
6 -1.9 5.7 -4.4 85 98 6.0 7.2 8.9 2.8 -2.7 4.1 17 2.9 71 0.5 997 1017 348 0.7 5.3 9.7 10.1 Sunny intervals all day
7 1.7 6.3 -1.7 71 86 5.5 6.5 8.9 2.1 -2.1 2.3 24 6.4 153 0.0 1017 1024 334 0.8 7.2 0.0 9.8 Sunny intervals all day
8 1.9 4.3 -1.7 72 93 5.1 6.1 8.4 2.4 -2.1 2.8 12 2.2 53 0.0 1015 1023 56 0.0 0.0 0.0 9.6 Cloudy all day
9 3.8 10.3 3.3 90 96 5.8 6.1 8.3 2.7 2.8 9.6 19 4.9 117 4.6 999 1015 112 0.6 0.0 0.0 9.5 Cloudy all day
10 -0.7 10.7 -2.2 85 99 6.0 6.5 8.3 2.8 -1.1 9.6 15 1.4 34 0.0 999 1006 334 0.8 6.9 2.6 9.3 Sunny all day
11 2.1 9.3 -2.2 78 98 5.7 6.1 8.3 2.6 -0.9 6.3 12 2.0 48 0.0 1005 1025 321 0.8 6.9 0.0 9.4 Sunny all day
12 -2.3 8.8 -4.4 83 99 4.9 5.8 8.3 2.5 -3.0 7.7 22 2.8 68 0.0 1020 1026 220 0.8 0.4 13.3 9.3 Brief sunny ints all day
13 7.3 9.0 5.6 80 90 5.8 6.0 8.3 2.1 4.4 7.1 24 7.4 177 0.0 1014 1020 79 0.5 0.0 0.0 9.4 Cloudy all day
14 4.6 7.9 1.7 79 92 6.1 6.2 7.8 2.4 2.9 6.2 14 3.0 73 0.0 1015 1019 224 0.8 0.4 0.0 9.3 Brief sunny ints all day
15 7.8 12.3 3.9 79 97 6.8 6.7 7.8 2.5 4.6 10.6 31 6.6 158 5.5 996 1015 337 1.0 3.9 0.0 9.2 Rain am, sunny intervals pm
16 5.5 8.7 0.6 71 93 6.8 6.9 7.8 2.1 1.6 6.3 26 3.6 87 9.8 996 1001 350 1.0 2.6 0.0 9.0 Sunshine and showers
17 3.2 9.1 0.0 70 94 6.0 6.7 8.3 2.9 0.6 6.2 22 3.8 92 6.7 999 1013 437 1.0 3.5 0.0 8.8 Showers am, sunny pm
18 5.1 12.1 -0.6 75 95 6.6 6.7 8.3 3.3 1.9 10.1 44 4.5 109 2.9 999 1009 428 0.9 2.6 0.0 8.8 Showers am, sunny ints pm
19 -0.4 8.9 -3.3 72 97 5.8 6.5 8.3 2.8 -1.2 4.5 17 1.2 30 0.7 1009 1012 428 1.0 4.9 1.2 8.7 Sunny intervals all day
20 1.4 12.2 -0.6 83 98 5.9 6.1 8.0 2.1 0.5 10.8 25 3.1 75 4.1 998 1011 283 0.9 1.4 0.0 8.7 Sunshine and light showers
21 4.5 13.3 2.2 84 99 6.8 6.7 7.8 2.5 3.2 11.8 20 2.5 59 6.2 1008 1014 132 0.8 0.0 0.0 8.8 Rain am, cloudy pm
22 8.5 12.6 2.8 75 96 7.8 7.2 7.8 2.0 5.9 11.1 21 2.4 58 1.9 1007 1019 281 1.0 1.9 0.0 8.8 Sunny intervals all day
23 7.2 14.0 2.8 89 98 8.0 7.8 8.0 2.3 5.9 12.5 23 5.9 141 0.0 1013 1019 371 1.1 0.8 0.0 8.9 Brief sunny ints all day
24 6.3 12.6 1.1 89 98 8.6 8.1 8.3 2.0 4.7 11.9 46 9.9 238 7.2 1003 1014 79 0.5 0.0 0.0 9.1 Rain am, cloudy pm
25 2.6 11.4 -1.1 65 98 7.5 8.0 8.3 2.0 1.7 7.3 32 3.5 85 0.0 1005 1008 544 1.0 5.2 0.0 9.3 Sunny intervals all day
26 2.3 9.6 -0.6 72 98 6.8 7.5 8.3 2.0 0.7 6.1 16 1.3 31 0.5 1008 1027 531 1.1 3.5 0.0 9.3 Sunny intervals all day
27 -0.1 11.9 -1.7 93 99 6.6 7.1 8.3 2.0 -0.9 11.4 19 2.6 63 2.2 1024 1028 132 0.8 0.0 1.1 9.3 Light rain am, cloudy pm
28 10.7 13.5 7.8 83 94 8.0 7.6 8.3 2.2 8.9 11.6 16 2.2 53 0.0 1028 1034 204 1.0 0.5 0.0 9.4 Sunny ints am, cloudy pm
29 10.1 13.3 -1.1 82 95 8.4 8.1 8.3 2.9 0.7 10.7 22 3.8 95 0.0 1027 1033 204 1.0 0.5 0.0 9.5 Brief sunny ints all day
30 -2.4 10.3 -3.9 77 98 7.2 8.0 8.3 3.0 -3.1 9.8 23 2.5 92 0.7 1007 1033 319 1.1 3.3 8.2 9.4 Sunny am, cloudy pm
31 3.3 10.3 -2.2 80 90 7.2 7.8 8.3 3.0 1.0 5.9 22 2.6 27 1.9 1004 1009 336 0.9 1.9 0.0 9.5 Sunshine and showers
3.7 10.5 0.3 78 96 6.8 7.1 8.3 2.5 1.6 8.5 22 3.3 2465 78.7 1006 1016 289 0.8 77.4 35.9 9.4  
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