How much snow has Rossberg Oberwil gotten this season and over the last few ski seasons? Rossberg Oberwil gets an average annual snowfall of 156cm of snow per year and on average has 18 snowfall days. Check out Rossberg Oberwil historical snowfall using the grid below with average Rossberg Oberwil snow stats that includes: Average Snowfall, Biggest Snowfall, Snowfall Days and Average Base Depth.