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‘Wind chill’ system, adjusted in 2001, dates back to 1945

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Patty Murray, Wisconsin Public Radio

The wind chill index, about which we'll be hearing at least through today, was developed in 1945 but modified in 2001. The change “toned down” drastic below-zero temperatures from decades past.

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One thing is for sure: it's cold. But the recalibration of the wind chill factor makes it tricky to compare current conditions to those from a few decades back.

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