Summary for December 2006
======================
VERY MILD FIRST-HALF; COLD/FOGGY FROM MID-MONTH: WINDY, WET END
TEMPERATURE (°C)
Mean of 24hr max & min:... 06.7 [+ 1.4 anomaly wrt eLTA 1971-2000]
Rolling 12 month temperature anomaly: +1.4 (was +1.2 end last month)
PRECIPITATION (PPN/mm)
Total rainfall/melted snow etc:... 93.3 [133% of eLTA of 1971-2000]
Rolling 12 month rainfall: 108% of eLTA (was 103% end last month)
Rolling 24 month rainfall: 94% of eLTA (was 91% end last month)
(Also note:
Number of days snow/rain & snow:....... 00
Number of days snow lying at 09UTC:.... 00
Deepest snow cover (date/s:........... - )
.... and I am no longer surprised by these 'NIL' returns, whereas 10 or
more years ago I might have been.
persistent fog (vis.1km) from afternoon 19th to ~0745/0750Z 23rd.
[ANNUAL]
[TEMPERATURE]
Anomaly for the whole year (based on 24hr maxima/minima) was +1.4degC.
By this measure, in a composite series 1971-2006, it is the warmest
year, beating 1990 & 1999 by 0.2degC.
(And as this period is generally acknowledged to include *the* warmest
year in the instrumental record, 2006 was probably the warmest for a
considerable length of time.)
Up to April inclusive, the year was 'nondescript' with below-average
months balancing above-average ones; from May onwards, a strong positive
bias shown, with 7 (out of 8) months showing an anomaly +1degC, and
three months (July, September & October) having anomalies +3degC.
[RAINFALL]
Total rainfall for this year (2006): 759.7 mm, representing 108% of the
'average'.
[THUNDER DAYS]
Total number of days 'thunder heard' = 27 (c.f. estimated local average
of the same measure of ~15). In fact, given the difficulty of
maintaining a continuous watch on 'thunder heard' events, I may have
missed a couple of 'flash-single bang' events, so the true total may be
higher.
--
Martin Rowley: data via -
http://homepage.ntlworld.com/booty.weather/metindex.htm
Bracknell (Wooden Hill/Tawfield), Berkshire
NGR: SU 854 667 Elev: 80m
Lat: 51DEG23MIN30SEC(N): Long: 00DEG46MIN28SEC(W)