Worldbuilding

From what I remember, most (all?) of the heat in the atmosphere, or at least in the troposphere, comes from the ground, with convection carrying heat into the upper atmosphere.

Looking at my temperature graph from my weather station in my backyard, overnight the temp dropped about 1 Freedom Unit per hour. So at the absolute quickest, and assuming an average surface temperature of 60 F when the sun vanishes, here's what I have

This is likely way too fast, as I believe the colder you are, the less heat you lose. Also, melting/boiling points depend on the surrounding pressure, which will get effected by the other gases precipitating. 70 below isn't unheard of, and the coldest temp ever reached was -128 in Antarctica.

What do you think. IDK I'm le tired.