That's cold. Anything colder than about -40 is seriously life-threatening.
I've been in those conditions - they're not for the faint-hearted, or the ill-shod. ;^)
I grew up in West Central MN and remember a few cold snaps, close to -50, and well into the -40s,, Yup, best to not travel unless necessary and be prepared and properly coifed.
The air literally crystallizes the nasal and lung membrane,.
That's cold. Anything colder than about -40 is seriously life-threatening.
We have an old, old family story about some trapper ancestors who worked for the Hudson's Bay company, in Montana somewhere. Apparently their group was headed back to the fort and one of the guys decided he needed to take a dump in the -50 degree temps. Fearing for his life, they allegedly prevented him from completing the task, but also didn't give him a chance to pull up his pants -- supposedly they chased him home with his pants around his ankles. Never heard if that fellow was able to have kids after that.....