How much snow has La Rosière 1850 gotten this season and over the last few ski seasons? La Rosière 1850 gets an average annual snowfall of 544cm of snow per year and on average has 40 snowfall days. Check out La Rosière 1850 historical snowfall using the grid below with average La Rosière 1850 snow stats that includes: Average Snowfall, Biggest Snowfall, Snowfall Days and Average Base Depth.