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record-breaking snowstorm in December set off a predictable flurry of "Where's global warming now?" snark in the deniosphere, but the final temperature figures from the month show a very different picture: Heavy snow is frequently uncorrelated with temperatures. The December 2009 average temperature of 37.9° was all of 1.6° below the long-term average. This made it the coldest December in the Nation's Capital since it was 36.4° in 2005. The month was one of five Decembers of the decade to be colder than average, but well above the 31.8° in 2000. For the decade overall, December averaged just 0.07° below normal.
Stay tuned next week for more analysis and charts of the monthly, yearly, and decade temperatures.
Cat out of the Bag
5 days ago