I thought that December had got colder as a month compared to 30 years ago?
This is discussed in the 1981-2010-philip-eden-cet-averages topic:
For example:
Thundery wintry showers, on 13 July 2010 - 16:39, said:
Philip Eden has created a set of provisional 1981-2010 averages for his alternative continuation of the CET (July-December values subject to revision as 2010 is not yet finished):
http://www.climate-u...provisional.htm
Some of his 1971-2000 average values differ from the Hadley versions by one or two tenths of a degree, which was somewhat unexpected- clearly those occasional 0.3-0.4C differences do not iron out fully over a 30-year period. The annual average is much the same though.
But the most significant part is that 1981-2010 represents a similar rise relative to 1971-2000 as 1971-2000 did to 1961-90. The only month that has failed to warm is December, which is back down to 4.8C which is close to the average for the twentieth century. June has finally responded to the warming trend after seeing no warming trend at all between 1659 and 2000.
Central England appears to be warming at a rate of 0.25C per decade, as compared with an average global warming of about 0.15C/decade and an average Northern Hemisphere of about 0.2C/decade.