I've never seen snow in Sulani, Del Sol Valley, Oasis Spring and StrangerVille, and I also use a couple of mods including MCC. All I can think of is a weather machine or mysterious weather. I checked in internet and someone had a similar problem when they installed the weather mod. Even after removing the mod, the problem persisted. You could try disabling mods, fix the game through origin and then check. Just to be sure. If not, and it still bothers you a lot, maybe uninstall and install Seasons & Island Living or the entire game? How long have you had this problem? Maybe the update broke something and they will fix it soon?
