Problem with Snowfall is that you can't mix it in with your normal game (unless they've changed it), you have to play on a snow level. Seasons with snow would have been great.
Planning on getting back into this for some chill build 'n' sim times. Was looking through discussions of what the best DLC is reckoned to be, and saw a mention of multiplayer. There is a mod of sorts, but apparently a bit glitchy.
So just to bask in the warm glow of your own imaginations for a moment, think of how cool cooperative city building would be in this, and even cooler would be the capability of cross-play between PC and Xbox etc...