Well, you know at least one, superficially at least. Up here we learn, at a young age, not to let the temps ge the best of us. Kids gotta play outside!
I can exist comfortably at about anything down to -40 thanks to a week at the Fort Greely aircrew survival school. They had us out there living in tents at -50. I understand how to dress for the weather. I'm not comfortable there but, -20 is no big deal. Just got to know how to dress for it. Wolf, beaver, lynx and such are great insulators. I was born up here, I guess it's simply a learned thing.
The Air Force taught me survival at extreme temps. Just growing up in Anchorage taught me to thrive at -20 or so. We'd play hockey, outside, no indoor arenas in those days, at -10 or so, hiking twn miles down the railroad tracks to the municipal rink. Just part of the day. It's all about what you grew up with I suppose.