I grew up in an area that the average
winter temp during the day..was -20F..on a warm day. And Ive seen it
-80F with a good wind blowing.

Yeouch!
Those "temperatures" are "wind chill". The EFFECTIVE temperature of
a combination of real temperature, wind speed, and humidity.\


Kinda like "humidex" in the summer, where a "moist heat" feals a lot
hotter than a "dry heat"