Adds dynamic winter - summer cycles with a moving cold snow front that gradually freezes and thaws the map. Turns natural bodies of water into ice and back. And a Christmas tree as a bonus :)
That makes sense. I'm not sure about freezing all entities - it might be too harsh, especially in the early game.
I'm also thinking about temporary freezing right after a very cold snow front. But I need to do some research to figure out whether this approach is feasible
Similar to my comment on the raid mod, you could have varying intensities of freezing weather such that only certain weather types can freeze buildings.