How much snow has Istebna - Zagroń gotten this season and over the last few ski seasons? Istebna - Zagroń gets an average annual snowfall of 69cm of snow per year and on average has 14 annual snowfall days. The current 10-year snowfall record is 25cm, the average snow depth at Istebna - Zagroń is 35cm. Check out Istebna - Zagroń historical snowfall using the grid below with average Istebna - Zagroń 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.