There is no such thing as normal weather. The average daytime high temperature for New York City this week should be 57[degrees]F, but on any given day the mercury will almost certainly fall short of that mark or overshoot it, perhaps by a lot. Manhattan thermometers can reach 65[degrees] in January every so often and plunge to 50[degrees] in July. And seasons are rarely normal. Winter snowfall and summer heat waves beat the average some years and fail to reach it in others. It's tough to pick out over-all changes in climate in the face of these natural fluctuations. An unusually...
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