[throwaway2037]

> The air in the cave will equalize to 32F once you enter thanks to body heat.

This is an interesting post! Can you explain the science behind why 32F/0C is important here? For example: If I build a snow cave in a place where it is -30C, -20C, -10C, 0C outside, will they all "equalize to 32F/0C"?

[devilbunny]

Snow is a very good insulator due to all the trapped air, and it’s fairly easy to make thick walls (the same as straw-and-mud block construction - not the highest R value per cm thickness, but if the walls can be 50 cm thick, it adds up). So yeah, a proper snow cave will converge on freezing point - body heat plus lighting will heat to that point, after which the snow melts.