Snowy years, like two years ago and '96, 30' total is quite common. Our friend's 3 story cabin was covered over the top by at least 5', not solid packed snow, but 12' from a 4 day storm.
Drought years, easily 7' by Feb.
Last year, 5' by Feb, but March alone got 8'.
Deepest snowball usually accumulates around end of Feb., I'd think an average would be somewhere around 180".