In 1978, in Alert NWT ( LAT 88* n) Temp minus 60 *F wind 40 MPH. Stuck in deep snow in A Nodwell sno-cat cab for 11 hours, engine running. Got out and tried to dig out with shovels for 45 mins. Froze fingers, toes, Hypothermia, but we got her out and spent another three hours getting to heated shelter before fuel exhausted. Warm (not hot) water baths for six hours, then hyperbaric oxygen to perfuse the frozen limbs. Amputation of two toes subsequently. Nasty. Close call. Below 50, never go outside if it is windy at all. Even the eskimoes build an igloo and stay inside with an oil light. No amount of any kind of clothing will keep you warm in such cold, even if you are moving. Gotta have shelter. Gotta have hi calorie food (blubber) or die, from exposure. No joke.