How much snow has Istebna - Zagroń gotten this season and over the last few ski seasons? Istebna - Zagroń gets an average annual snowfall of 70cm of snow per year and on average has 14 snowfall days. Check out Istebna - Zagroń historical snowfall using the grid below with average Istebna - Zagroń snow stats that includes: Average Snowfall, Biggest Snowfall, Snowfall Days and Average Base Depth.