How much snow has Willamette Pass gotten this season and over the last few ski seasons? Willamette Pass gets an average annual snowfall of 155" of snow per year and on average has 30 annual snowfall days. The current 10-year snowfall record is 33". Check out Willamette Pass historical snowfall using the grid below with average Willamette Pass snow stats that includes: Average Snowfall, Max Base Depth, Biggest Snowfall, Snowfall Days and Average Base Depth.