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 annual snowfall days. The current 10-year snowfall record is 50cm, the average snow depth at Rossberg Oberwil is 51cm. Check out Rossberg Oberwil historical snowfall using the grid below with average Rossberg Oberwil snow stats that includes: Average Snowfall, Max Base Depth, Biggest Snowfall, Snowfall Days and Average Base Depth. Click on the Annual Tab to see every year since the 2013-2014 season.