|
December 2019 |
 |
|
The spectacular Triassic
sandstone cliffs just east of Sidmouth basking in sunshine on a December day |
|
A rather interesting month.
Lots of sunshine and showers with many 'summer-like' thunderstorms
at times leading to torrential downpours. Much calmer and drier
during the final week. Mild throughout by day with only slight to
moderate air frosts under clear, starry skies. A little warmer and
sunnier than normal but with well-above average rainfall. Warmest
December since 2018 (9.1C); sunniest since 2017 (91.4 hours) and the
wettest since 2012 (171 mm). |
|
Summary for December 2019 |
|
Mean Max: |
10.9ºC |
(+1.6ºC) |
|
Mean Min: |
4.3ºC |
(+1.0ºC) |
|
Mean: |
7.6ºC |
(+1.2ºC) |
|
High Max: |
14.5ºC |
6th |
|
Low Max: |
7.3ºC |
2nd |
|
High Min: |
10.2ºC |
6th |
|
Low Min: |
-1.8ºC |
5th |
|
Mean Grass Min: |
1.6ºC |
|
|
Grass Min: |
-4.4ºC |
18th |
|
Days >10°C |
24 Days |
|
|
Days >5°C |
31 Days |
|
|
Nights >5°C |
16 Days |
|
|
Nights >0°C |
24 Days |
|
|
Rain Total (gauge): |
125.6 mm |
(140%) |
|
Rain Total (tipping bucket): |
123.5 mm |
(138%) |
|
Rain Days >0.2 mm: |
20 Days |
|
|
Rain Days >1.0 mm: |
18 Days |
|
|
Max 24 hrs: |
17.3 mm |
19th |
|
Days without any rain: |
11 |
|
|
Air Frost: |
6 Days |
|
|
Grass Frost: |
10 Days |
|
|
Snow Falling: |
0 Days |
|
|
Snow (50%) @ 9am: |
0 Days |
|
|
Ice Days: |
0 Days |
|
|
Thunder Heard: |
4 Days |
|
|
Hail <5 mm: |
3 Days |
|
|
Hail >5 mm: |
0 Days |
|
|
Fog @ 9am: |
0 Days |
|
|
Total Monthly Sunshine: |
87.5 Hours |
(110%) |
|
Most Sunshine in a Day: |
7.5 Hours |
3rd |
|
Average Daily Sunshine: |
2.8 Hours |
|
|
Sunless Days: |
5 Days |
|
|
Cloudless Days: |
1 Day |
2nd |
|
Total Possible Sunshine: |
249.8 Hours |
|
|
Percentage of Total Sun: |
35% |
|
|
Average Sunny Interval: |
17.2 |
mins |
|
Maximum UV Index: |
1.3 |
2nd |
|
Mean Soil Temp @ 10 cm: |
8.2ºC |
|
|
Min Soil Temp @ 10 cm: |
6.6ºC |
5th |
|
Max Soil Temp @ 10 cm: |
10.2ºC |
29th |
|
Mean Soil Temp @ 30 cm: |
9.0ºC |
|
|
Min Soil Temp @ 30 cm: |
7.5ºC |
5th |
|
Max Soil Temp @ 30 cm: |
11.9ºC |
29th |
|
Mean Soil Temp @ 100 cm: |
9.7ºC |
|
|
Min Soil Temp @ 100 cm: |
9.2ºC |
20th |
|
Max Soil Temp @ 100 cm: |
10.6ºC |
1st |
|
Ave 10 Min Wind >39 mph: |
0.00 Days |
|
|
N: |
2.45 Days |
8% |
|
NE: |
0.91 Days |
3% |
|
E: |
0.94 Days |
3% |
|
SE: |
1.99 Days |
6% |
|
S: |
6.57 Days |
21% |
|
SW: |
5.57 Days |
18% |
|
W: |
3.70 Days |
12% |
|
NW: |
3.03 Days |
10% |
|
Calm: |
5.84 Days |
19% |
|
Wind Chill Low: |
-4.4ºC |
2nd |
|
Mean Wind: |
4.6 mph |
|
|
Max Gust: |
48 mph |
10th |
|
Mean Cloud Cover: |
54% |
|
|
Mean RH @ 9am: |
95% |
|
|
Rain >0.1mm/hour: |
33.9 Hours |
|
|
Frost Duration: |
32.8 Hours |
|
|
Air Frost in a Day: |
9.8 Hours |
2nd |
|
Mean Sea Temperature: |
10.7ºC |
(+0.4ºC) |
|
Normal for Month: |
10.3ºC |
|
|
Max Sea Temperature: |
12.1ºC |
8th |
|
Min Sea Temperature: |
9.0ºC |
3rd |
|
Mean Pressure @ 9am: |
1010.0 hPa |
|
|
Mean Pressure: |
1008.7 hPa |
|
|
Max Pressure: |
1035.7 hPa |
28th |
|
Min Pressure: |
966.6 hPa |
21st |
|
Max Change in 24 hours: |
31.5 hPa |
9th |
|
Radiation Daily Mean: |
2.69 MJ/m² |
|
|
Max Daily Value: |
3.96 MJ/m² |
4th |
|
Min Daily Value: |
1.03 MJ/m² |
19th |
|
Number of Days with Data: |
31 Days |
|
|
1-Hour Maximum: |
269 W/m² |
2nd |
|
Starting Time of the Hour: |
|
12:00 |
|
Max Dewpoint: |
12.3ºC |
6th |
|
Min Dewpoint: |
-3.6ºC |
2nd |
|
Mean Dewpoint: |
6.1ºC |
|
|
Max Humidity: |
100% |
4th |
|
Min Humidity: |
64% |
9th |
|
Mean Humidity: |
91% |
|
 |
|
|
|
Weather Data for Otter Valley, Devon.
December 2019 |
|
|
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 |
2.5 |
8.6 |
1.1 |
79 |
96 |
8.7 |
9.4 |
10.6 |
4.0 |
1.4 |
5.4 |
21 |
5.4 |
130 |
0.0 |
1018 |
1029 |
262 |
1.1 |
5.3 |
0.0 |
11.1 |
Sunny intervals all day |
|
2 |
-2.9 |
7.3 |
-2.8 |
78 |
99 |
7.6 |
8.8 |
10.6 |
3.9 |
-3.6 |
4.1 |
10 |
1.4 |
32 |
0.0 |
1029 |
1034 |
311 |
1.3 |
5.4 |
9.8 |
10.3 |
Sunny intervals all day |
|
3 |
0.1 |
11.1 |
0.0 |
78 |
99 |
7.2 |
8.3 |
10.6 |
4.0 |
-0.8 |
7.7 |
9 |
0.8 |
19 |
0.0 |
1024 |
1033 |
236 |
1.3 |
7.5 |
0.0 |
9.7 |
Sunny all day |
|
4 |
-0.8 |
10.3 |
-0.6 |
77 |
100 |
6.8 |
7.8 |
10.5 |
4.4 |
-1.4 |
7.9 |
8 |
1.5 |
37 |
0.0 |
1019 |
1023 |
279 |
1.1 |
5.4 |
8.5 |
9.8 |
Sunny intervals all day |
|
5 |
-1.8 |
10.6 |
-1.1 |
88 |
100 |
6.6 |
7.5 |
10.0 |
4.4 |
-2.3 |
9.6 |
23 |
3.1 |
74 |
0.0 |
1016 |
1023 |
228 |
1.1 |
2.1 |
0.1 |
9.8 |
Sunny intervals all day |
|
6 |
10.2 |
14.5 |
8.3 |
80 |
96 |
8.1 |
8.0 |
10.0 |
3.9 |
8.7 |
12.3 |
28 |
6.9 |
165 |
3.2 |
1005 |
1016 |
222 |
1.0 |
1.9 |
0.0 |
11.4 |
Sunny intervals all day |
|
7 |
5.7 |
11.4 |
3.3 |
88 |
99 |
8.4 |
8.4 |
10.0 |
4.0 |
5.2 |
9.9 |
25 |
2.9 |
69 |
0.0 |
1010 |
1016 |
235 |
1.1 |
2.2 |
0.0 |
11.7 |
Sunny intervals all day |
|
8 |
6.3 |
12.7 |
4.4 |
75 |
98 |
8.9 |
8.9 |
10.0 |
4.2 |
4.8 |
12.2 |
42 |
8.8 |
211 |
3.9 |
996 |
1010 |
292 |
1.1 |
3.6 |
0.0 |
12.0 |
Sunshine & thundery showers |
|
9 |
7.6 |
11.0 |
0.0 |
64 |
96 |
8.5 |
8.9 |
10.0 |
6.9 |
-0.2 |
7.7 |
37 |
8.6 |
206 |
4.1 |
995 |
1026 |
228 |
1.1 |
6.6 |
0.0 |
11.5 |
Sunny intervals all day |
|
10 |
-0.7 |
12.5 |
-0.6 |
88 |
100 |
8.1 |
8.9 |
10.0 |
4.9 |
-1.4 |
12.1 |
48 |
13.8 |
331 |
0.7 |
1004 |
1026 |
48 |
0.0 |
0.0 |
4.8 |
11.4 |
Cloudy all day |
|
11 |
1.3 |
8.8 |
0.0 |
82 |
100 |
7.9 |
8.7 |
10.0 |
5.0 |
0.7 |
6.9 |
22 |
2.0 |
47 |
1.8 |
1002 |
1010 |
268 |
0.9 |
3.0 |
0.0 |
11.0 |
Sunny intervals all day |
|
12 |
0.0 |
10.6 |
-0.6 |
93 |
100 |
7.5 |
8.3 |
10.0 |
5.0 |
-0.5 |
10.3 |
26 |
5.1 |
122 |
7.8 |
977 |
1006 |
115 |
0.8 |
0.3 |
0.0 |
11.2 |
Rain, intermittent all day |
|
13 |
6.4 |
10.4 |
3.3 |
67 |
98 |
7.8 |
8.3 |
9.7 |
6.9 |
3.6 |
9.6 |
39 |
7.3 |
175 |
6.2 |
976 |
989 |
217 |
1.0 |
5.8 |
0.0 |
11.3 |
Sunny intervals all day |
|
14 |
5.8 |
11.2 |
2.8 |
64 |
96 |
7.8 |
8.3 |
9.5 |
4.9 |
2.4 |
9.7 |
37 |
7.3 |
176 |
10.1 |
980 |
996 |
226 |
1.0 |
5.2 |
0.0 |
11.2 |
Sunny ints, thunderstorm pm |
|
15 |
4.6 |
11.1 |
1.7 |
76 |
97 |
7.6 |
8.3 |
9.4 |
5.0 |
3.2 |
7.8 |
33 |
7.2 |
174 |
12.2 |
988 |
998 |
263 |
1.0 |
5.7 |
0.0 |
11.1 |
Sunny ints, thunderstorm pm |
|
16 |
1.5 |
9.3 |
1.7 |
93 |
100 |
7.0 |
7.9 |
9.4 |
4.9 |
1.0 |
8.5 |
11 |
0.6 |
15 |
0.0 |
997 |
1001 |
244 |
1.0 |
1.7 |
0.0 |
9.9 |
Sunny intervals all day |
|
17 |
1.7 |
8.0 |
-1.7 |
96 |
99 |
7.2 |
7.8 |
9.4 |
4.0 |
0.1 |
7.7 |
5 |
0.3 |
7 |
2.8 |
997 |
1005 |
219 |
0.8 |
2.4 |
0.0 |
10.1 |
Sunny intervals all day |
|
18 |
-1.5 |
11.9 |
-4.4 |
87 |
100 |
6.8 |
7.7 |
9.4 |
4.6 |
-1.9 |
11.1 |
35 |
7.0 |
168 |
12.9 |
998 |
1008 |
132 |
0.8 |
0.2 |
8.4 |
10.5 |
Brief sunny intervals all day |
|
19 |
9.3 |
12.2 |
7.8 |
93 |
98 |
8.3 |
8.1 |
9.4 |
5.4 |
8.2 |
11.8 |
35 |
11.0 |
263 |
17.3 |
986 |
998 |
56 |
0.7 |
0.0 |
0.0 |
10.9 |
Rain all day, thunder pm |
|
20 |
6.6 |
11.0 |
-1.1 |
89 |
99 |
8.6 |
8.8 |
9.2 |
5.0 |
1.8 |
10.2 |
28 |
3.4 |
82 |
5.3 |
978 |
986 |
213 |
0.9 |
1.5 |
0.0 |
10.3 |
Sunshine & showers |
|
21 |
3.5 |
10.8 |
-0.6 |
91 |
100 |
7.8 |
8.9 |
9.4 |
4.5 |
3.1 |
10.3 |
31 |
4.0 |
97 |
10.6 |
967 |
983 |
280 |
0.9 |
0.6 |
0.0 |
10.5 |
Sunny intervals all day |
|
22 |
6.6 |
11.4 |
1.7 |
81 |
99 |
7.9 |
9.1 |
9.4 |
4.5 |
5.8 |
8.7 |
21 |
4.0 |
97 |
3.0 |
969 |
997 |
246 |
0.9 |
3.8 |
0.0 |
10.6 |
Sunny intervals all day |
|
23 |
6.6 |
12.6 |
2.8 |
78 |
97 |
8.0 |
9.4 |
9.4 |
4.0 |
5.9 |
9.0 |
21 |
3.9 |
93 |
2.8 |
997 |
1013 |
275 |
1.0 |
3.6 |
0.0 |
10.8 |
Sunny intervals all day |
|
24 |
6.3 |
12.4 |
0.6 |
85 |
99 |
8.3 |
9.5 |
9.4 |
4.0 |
5.5 |
10.3 |
26 |
5.5 |
131 |
1.6 |
1006 |
1016 |
220 |
1.0 |
2.6 |
0.0 |
10.8 |
Sunny intervals all day |
|
25 |
-0.2 |
9.3 |
-3.3 |
82 |
99 |
7.6 |
9.1 |
9.4 |
4.0 |
-0.6 |
7.5 |
26 |
2.4 |
58 |
0.0 |
1016 |
1026 |
229 |
1.0 |
6.0 |
1.1 |
10.5 |
Sunny intervals all day |
|
26 |
9.1 |
12.6 |
6.1 |
81 |
98 |
8.3 |
9.5 |
9.4 |
4.7 |
6.8 |
12.0 |
38 |
7.6 |
183 |
11.5 |
1006 |
1021 |
226 |
0.9 |
0.5 |
0.0 |
10.6 |
Rain am, sunny ints pm |
|
27 |
9.8 |
12.7 |
8.9 |
95 |
99 |
9.6 |
10.4 |
9.4 |
6.6 |
9.3 |
12.1 |
22 |
1.1 |
27 |
5.5 |
1018 |
1033 |
117 |
0.8 |
0.0 |
0.0 |
10.6 |
Cloudy all day |
|
28 |
7.2 |
11.5 |
2.8 |
91 |
99 |
10.0 |
11.3 |
9.4 |
4.2 |
6.7 |
10.7 |
14 |
2.2 |
49 |
0.2 |
1033 |
1036 |
101 |
0.8 |
0.0 |
0.0 |
10.6 |
Cloudy all day |
|
29 |
9.1 |
10.4 |
6.7 |
90 |
97 |
10.2 |
11.9 |
9.4 |
4.7 |
7.7 |
9.3 |
21 |
4.3 |
108 |
0.0 |
1031 |
1035 |
147 |
0.9 |
0.2 |
0.0 |
10.4 |
Sunny intervals all day |
|
30 |
4.3 |
11.2 |
0.0 |
92 |
99 |
10.1 |
11.6 |
9.4 |
4.0 |
3.3 |
10.1 |
12 |
1.4 |
50 |
0.0 |
1028 |
1031 |
220 |
1.0 |
4.3 |
0.0 |
10.2 |
Cloudy all day |
|
31 |
5.5 |
8.9 |
2.2 |
90 |
94 |
10.0 |
11.6 |
9.4 |
4.0 |
5.6 |
7.9 |
10 |
1.7 |
17 |
0.0 |
1029 |
1031 |
89 |
0.8 |
0.0 |
0.0 |
10.4 |
Cloudy all day |
|
|
4.2 |
10.9 |
1.6 |
84 |
98 |
8.2 |
9.0 |
9.7 |
4.7 |
2.8 |
9.4 |
25 |
4.6 |
3411 |
123.5 |
1003 |
1015 |
208 |
0.9 |
87.5 |
32.8 |
10.7 |
|
 |
|
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|
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|
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