They get about 375" per season, that's almost as much as Big Sky and Whistler. I went fist week January since they already had about 50" of snowfall since the beginning of December and were fully open (77 trails) but the east coast warmed up for 2-3 days and rained. Jay lost almost all of their terrain but 17-20 trails.
Check this out:
Jay Peak Promo 2008