I lived the first 29 years of my life in Alaska.
The coldest temp I have ever experienced, probably in the -50 to -60 range as a student at UAF Fairbanks.
I've worked outdoors for extended periods in the -20s.
I've also cross country skied in the -20 to -30 range a few times.
I think I fought one fire (was a volunteer fire fighter) that was well below zero...
However, for the last 5 years that I lived in Alaska, I only drove two... roadsters, if you will. Both were cars that I had chopped the roofs off of, so they only had front windshield glass. Basically they were convertables without the roof-up option. One was a Karman Ghia, the other was a Dodge Dart that I turned into a Batmobile. I drove those two cars in rain, snow, sleet, hail, sun, whatever mother nature handed me.
I had a set of WWII sheepskin bomber gear (B-3 coat, pants and replica hat) and a set of turn-outs (Firefighting pants and coat). Also had a few pair of aviator style VB (bunny) boots. With this gear (and layers underneath) I could handle an hours drive to my parents house in the Mat. Valley in the -20s without getting cold.
eskimo