We had almost a week of -20C highs and -27C lows and then a couple days ago it warmed up. I went out to feed the critters and felt what seemed to me, a "warm breeze"... After I was done I checked the thermometer, -5C
Compared to -27 I guess it is relatively warm!
Once you dress for it -10C is perfect winter temperature, the snowmobile runs properly, the snow on the driveway is a bit squeeky.
Ian