On Friday, 1 January 2016 09:53:39 UTC, Dave Cornwell wrote:
A ridiculously warm month! Maximum 16.3C. Mean 5.7C above 1981-2010
average. Mean Max 5.5C above average. Mean Minimum 5.8C above average.
Zero air frosts! Lowest minimum 2.6C
24 rain days but a dry month! Only one day managed 5mm. Rainfall 74% of
mean. A dull, cloudy, windy month. I suspect there was less than 40
hours of sunshine.
No pressure below 1000 mb
Unbelievable!


Summary for December 2015

Temperature (°C):

Mean (min+max) 10.8 (+5.7)
Mean Minimum 8.5 (+5.8)
Mean Maximum 13.1 (+5.5)
Minimum 2.6 day 09
Maximum 16.3 day 19
Highest Minimum 13.0 day 26
Lowest Maximum 9.5 day 14
Air frosts 0

Rainfall (mm):
Total for month 39.1 (74%)
Wettest day 5.0 day 20
Rain days 24
Dry days 7

Wind (mph):
Highest Gust 50 day 30

Pressure (mb):
Maximum 1034.9 day 09
Minimum 1000.0 day 06

Days with snow falling 0
Days with snow lying at 0900 0


Dave

Because I'm 09-09 here in Wanstead December was technically not frost free. Temp fell to -0.2C at 0639. Obviously lots of 'what ifs' but I'm just keeping it consistent with the old stats at Greenwich which were 09-09.
The best argument I've seen for 09-09 is that most observers are not around at midnight to read the manual instruments.

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