How much snow has Chastreix Sancy gotten this season and over the last few ski seasons? Chastreix Sancy gets an average annual snowfall of 170cm of snow per year and on average has 20 snowfall days. Check out Chastreix Sancy historical snowfall using the grid below with average Chastreix Sancy snow stats that includes: Average Snowfall, Biggest Snowfall, Snowfall Days and Average Base Depth.