-40 imagine walking outside and the air hurts your face, like being close to a sand blaster, and then the wind picks up..... Then it's like being in a gravel blaster, and then the snow starts flying when the wind picks up even more, then it's like being in a shards of glass blaster.... Sad part is, I'm not exaggerating all that much... -35 or so is the coldest I can remember, that was 3 years ago and it was WINDY, it was for a good 3 days straight it was that cold.
I don't ever want to see 100 delta here. That would mean the house is burning since outside never gets below about 0ºF. As far as that dry cold, I grew up in suburb of Montreal so I definitely know that situation but I can live without it these days. I used to dread going outside on a bright sunny windless day. It meant your nose was going to just burn on every inhale.