Took a winter trip to Norway once with friends, which included a Norwegian that'd immigrated away to the much milder climate the rest of us were all used to. We got a meter of overnight snow and I'd never seen a person so eager to get shoveling, it took her right back to her childhood. What a machine too, once she got going.

We were dealing with -10C to -20C , but as someone else pointed out my takeaway was that it's really your extremities that you need to think about, there rest of my body was easy to keep warm in comparison. I ended up taking a pair of winter motorcycle gloves I had laying around on the trip, water and wind proof and those worked like a charm with an additional pair of thin, inner gloves, so there's a tip!

I didn't quite nail keeping my feet warm though, but I was wearing regular hiking boots with very thick wool socks. Still felt like I was draining heat to the ground at a rapid rate though.