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D.C. should prepare for a chilly December with the possibility of snow.

‘Greenland block’ could mean cold and snow by mid-December in D.C. area. Large high pressure zone over Greenland predicted by computer models. Models show this feature flirting with intensity records set in December 2010. Washington has not seen more snow than that during December in 11 years.

November was the 11th warmest November on record in Washington and the 86th driest (tying 1927). The three-month rainfall total of 7.7 inches was 2.8 inches drier than normal. November started very warm, turned very cold mid-month and then closed mild.