I have run my buggy alot in the snow and newer had electronic problems except when i i used the original battery pack. snow shortcircuited it and servos were actin crazy. got me a 5cell hump pack and that is more waterproof. havent sealed any of the electronics either.
The tranny doesnt seem to like very cold weather though, it kinda slips out of gear or something when its cold, works okay when i run it slow a little to warm it up. Its fun bashing it around in a couple of inches fresh snow,a white cloud moving reallyreally fast!