-50 F ain't no thang!
If you'd watch the last Iditorod you'd discovered that the sled dogs of the North can do much better than -50 F, and some white folk, only partially adapted to such temperatures, can at least survive it provided they have some degree of shelter ~ and plenty of spare dogs!
It isn't constantly cold all winter long ~ it comes in bursts and waves. You travel in between the really cold periods.
Sir, I live in the north. Adapted or not, no one moves if they can avoid doing so in the winter.