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-30C is actually not that bad when the air is dry.

it's also much easier to stay dry, and thus warm, at -30 than at -2

Try -30 and 75% relative humidity. It takes a few weeks for the humidity to go down, but during those weeks you will freeze your ass off.

and you have no wind.

Yeh, -30 with low humidity, wind free and sunny, it feels like +10