I think it would be awesome to have a full on snow map. I know the game cant handle weather right now but Im sure theres a way to simulate a long mid-west style road wherein the road is washed away by snowfall. In short of that maybe the dev team or some modder could make weathered variations of the base maps. Maybe have a Utah map where an extreme heat wavw is present, making driving cars for a long time on said map a death sentence for them. Maybe have the east coast map covered in rain, or flooded.
https://www.beamng.com/resources/mt-shell.15/ Oldschool one... but I "think" (don't know for sure) it still works...