I am experiencing massive swings in temperature on my colony every 2-3 in game days. Probably not WAI.
I think it's because all the frigusium is frozen, which leads to very high temperatures.
But then high temperature melts the frigusium, which leads to very low temperatures.
But then the frigusium freezes, and the cycle starts again. Pictures are taken 2 days apart.
Also, the surface temperature can go below absolute zero. This could be either an unrelated bug, or, as I believe, the cause of the aforementioned problem (frigusium is not supposed to freeze until absolute zero, right? That would solve the problem, if the game didn't allow sub-absolute zero temperatures).