Wednesday, September 8, 2010

More on First Freeze

Here is a plot of the past 40 years of the first date in the autumn at the Fairbanks Airport (bottom) and North Pole (top) with a low temperature at or below freezing. The black line is the five year running average. So the lack of a freeze at the Airport is not unusual yet, especially given that in the past four falls the first freeze didn't occur until after September 20th. However, the lack of a freeze at North Pole this late is unprecedented. Also note the lack of correlation in the dates and trends!

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