Climate change skeptics, including the communications director for the Republican minority in the Senate Environment and Public Works committee, have seized upon the unusually cold winter in North America as evidence that global warming is not really happening. There is no doubt that this year’s La Niña has led to cooler winter weather over North America than we have seen for the past decade (see figure from NYT: 1980-2008 trend), but even this cooler weather is above the 1960-1990 monthly winter average.
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In looking at the weather in any single year, it is important to
keep in mind that story of the statistician who drowned while trying
to wade across a river that had an average depth of two feet.