How much snow has Mt St Louis-Moonstone gotten this season and over the last few ski seasons? Mt St Louis-Moonstone gets an average annual snowfall of 46" of snow per year and on average has 22 snowfall days. Check out Mt St Louis-Moonstone historical snowfall using the grid below with average Mt St Louis-Moonstone snow stats that includes: Average Snowfall, Biggest Snowfall, Snowfall Days and Average Base Depth.