I just finished my day as a letter carrier for the US postal service up here in the frozen north. I have a walking route that takes about 6 and a half hours on the street. When I started this morning at 10 am, it was 10 below. By the time I ended my route it had gotten up to a "high" of zero degrees. After 25 years of doing this, I can say that the human body does get acclimated to the cold. I made it just fine. I hope I got all the mail to the correct addresses on my route! Oh, by the way, my 2007 Crossfire base coupe started just fine, although the steering and the clutch and the shifter were pretty slow to warm up!!