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According to the weather channel, historically the two months only differ in highs and lows by 1 degree, with December being warmer. I don't know about wind chill though which makes a big difference (to me, at least).
Mike: Usually feels colder in Feb. In December, the cold air is really just getting started, people get excited about the first couple of snowfalls, and Christmas is coming. By February, it's get me the hell out of here, I want some sun and sand.