Yeah, a lot of areas have the same Wx because the towns are in the basins; even a town as big as Salt Lake has a nasty inversion layer that hangs between the Wasatch and the Oquirrh range in the winter.
Jackson has a marketing problem with the temperatures so they make sure to downplay it, but word gets around. Obviously it’s not like that all winter every winter, but often enough. The rich peeples don’t ski anyway, I guess they send the butlers out to do that for them...they can afford the heating bills too, so they just flit in for a short stay, hit the bars at the resort and then head back to California or New York...
Jackson is an extreme mountain as well. I visited a friend who lived there in the early 90’s but my one day to ski was nasty with poor visibility. I did have a good time at the Mangy Moose the night before.