I downloaded the North American Rutgers data of monthly snow cover from 1967 to 2009, and normalized the data to the monthly averages and then calculated the deviations. (Normalizing the data supresses noise caused by small relative changes in larger absolute snowfall cover numbers – e.g, if I lose 8 kg, its only 10 percent of my body weight, but if a sick 32 kg child loses 8 kg, that’s a serious change).
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