I love this idea! Glad it's planned to be in, especially with seasons. What would make this the best would be the snow actually accumulating. That's the top of the list because I'm Canadian with it needing to be further drilled into the soul. For those that hate this should build in the tropical biomes. Be a snowbird, I say jokingly. Seeing snow building up, especially during a blizzard would be glorious when in your buildings or in an old-fashioned fancy cabin.
I'd happily try and gain access to snowmobiles, snowshoeing, skiing, and etc. Whatever option you allow us to do, I'll do it. I'll happily try getting lost in a scenery that allows for snow accumulating, needing to be shoveled, packed down, or similar. Best if there were no limits, or at least a loose limit of reaching a quarter up a tall pine tree. I wonder if anybody is up for ice fishing?
Bonus points if you can get the rarer freezing rain creating ice sheets into the game. Doesn't have to be from the start, just something to happen at random. Imagine slipping and sliding around heh. All those vehicles rendered useless from sliding, unless they have chains or those tank-like arctic vehicles.