this has been discussed before irrc olso, wait for s3, for now its all about bugs afaik, later the devs will add all this kind of stuff including, rain, night etc
I found on Wikkipedia comparisons between different versions of online race sims! (unsure of link... use wikki's search) It said that LFS had SNOW/ICE for internal testing only! So from what I see, LFS is probably->definitly going to have something like that!
Snow and ice would be good, but only when we get a WRC or Andros Trophy car but ice racing is better than rallying (as is proper rallycross).