Change in wind chill factor means current marks can't be directly compared to old ones.
63 below no doubt bone-chilling, but not the same as before 2001
When parents in Minot, N.D., tell their youngsters that Thursday's wind chill of 63 degrees below zero wasn't as low as the wind chill when they were kids, they're not just blowing hot air.
In fact, it would have been a 78-below wind chill prior to 2001, when the National Weather Service revised its wind chill index, said Rich Leblang, weather service meteorologist in Bismarck.
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