Yeah, I guess California gets pretty dry during several months of the year as well, and still it's not a super dry snow winter spot...
I think there are places in the Andes that may get more than 300-350 inches per winter, but probably they are very far from big urban areas.
Southern Chile has very wet winters.
Chillan is relatively more reliable than Santiago / Mendoza resorts, in my opinion, these picts were taken in mid-August, after a 3 days storm, a few years ago:
Chillan base area:
Maybe the perfect resort for South America regarding snow, would be in southern Chile, bellow 45 degrees south, with a base above 4000ft.
It might be a glaciar though...