820
Metal rule
(slrpnk.net)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
Ehh there's not much difference between -6 and-18 you can get warm by doing whatever activity. Somehow -3 to +3 is the hardest to stay warm in. Too much moisture in the air. Below-18 is where the dry cold starts to be tough.
Yeah 0F is -18 and that’s when your Moses starts to stick together when you breath in.
You’re apparently better off swallowing your snot too, since it’s largely condensed water vapor from your own lungs and you’ll dehydrate slower.
Source: have always lived within a short drive to Canada.