Brrr... That -30 (F. I assume)is c-c-cold. The lowest Temp I've ever slept in was -22 F. in a quinzhee. I was very comfortable. The coldest in a tent was -10 F. That too was OK

The coldest I've tried to ski in was -40 F. at the Pre-Olympics in '79 at Lake Placid, N.Y. The snow was like sand.