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In weather terms, 2012 in New York City began for me with crocuses. On an early February day in a week in which the temperature hit 60 degrees, I spotted their green shoots pushing up through the bare ground of a local park on a morning walk -- just as if it were spring. The year was ending last weekend as I wandered with a friend past a communal garden in the same park and noticed that, in a December week in which the temperatures were in the mid-50s, the last few roses were still in bloom.