December 2017: average temps, wet

December 2017 was a wet month. Just over 83mm of rain was recorded, 157 per cent of average, the wettest December since 2012 and the 38th wettest since 1797.

Screen Shot 2018-01-03 at 19.30.21
The snow depth on December 10th reached 5cm at its maximum

The monthly mean finished 5.6C, precisely average and the coolest December for five years.

Some 48 hours of sunshine were recorded, 120 per cent of average, slightly less than last year.

The most notable event was the on December 10th which produced the best snowfall in 5 years

Air frosts: 10. Ground frosts: 14. Snow falling: 2. Snow lying: 1.

January (on the 3rd) is looking like it may produce more snowfall events similar to December though, with models suggesting a build in heights to the north. A look at the output, including GFS and ECM, suggests the UK will be in a battleground between a cold airmass to the east and warm Atlantic air to the west.

It would seem to back up my winter forecast and also the December analogues with nothing warmer than average.

Average: 33%
Rather cold: 17%
Cold: 17%
Very cold: 0%
Severe: 33%

Screen Shot 2018-01-03 at 19.29.51

Full stats for December here:

Summary for December 2017
Temperature (°C):
Mean (1 minute)  5.8
Mean (min+max)   5.5
Mean Minimum     2.8
Mean Maximum     8.3
Minimum          -3.7 day 11
Maximum          14.2 day 30
Highest Minimum  9.8 day 21
Lowest Maximum   2.4 day 10
Air frosts       10
Rainfall (mm):
Total for month  83.7
Wettest day      14.6 day 10
High rain rate   12.1 day 31
Rain days        21
Dry days         10
Wind (mph):
Highest Gust     25.1 day 30
Average Speed    3.5
Wind Run         2570.0 miles
Gale days        0
Pressure (mb):
Maximum          1036.4 day 22
Minimum          970.3 day 10
Days with snow falling         3
Days with snow lying at 0900   1
Total hours of sunshine        48.3 (120%)
Screen Shot 2018-01-03 at 19.30.41

3 thoughts on “December 2017: average temps, wet”

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