So where was all this winter camping, your bio is blank?
My personal low is -47F (thermometer not wind chill) and although I have back packed and tent camped in 6 ft of snow (above Idylwild in the mountains above Palm Springs,) it wasn't THAT much below zero. Minot AFB in NODAK is a cold son of a gun though.
So, were you in Minnesota, UP Michigan, Canada, or what, it sure wasn't ND due to lack of credible forests.
These days the average snowmobiler is better dressed for arctic ops than the average USAF guy at Minot (back when it was a SAC base) was defending our northern flanks from the evil scourge of COMMUNISM!
Once conditions got so bad exposed flesh would freeze in less than 10 seconds, non essential personnel were excused from duty and dependents were not to venture outside. Of course we strived to not expose flesh under those conditions.
Pat