In the December of 1984 I still lived with my parents in Regina, Saskatchewan. The highest temperature for the month prior to 12/24 was -38c (almost the same in F as -40c = -40f). Nightimes went down usually below -50c (-58f). We didn't go out much. Cars were plugged in but only sometimes started. We did go to church on Xmas eve. And while looking at lights I got out to get a Big Gulp at the local 7-11. I honestly felt warmth on my face. It had reached -16c (just above 0f). It is the only time in my life -16c has felt warm. It warmed up more the last week but I remember that month still when I think of the cold now.