How much snow has Grong gotten this season and over the last few ski seasons? Grong gets an average annual snowfall of 56cm of snow per year and on average has 8 annual snowfall days. The current 10-year snowfall record is 30cm, the average snow depth at Grong is 45cm. Check out Grong historical snowfall using the grid below with average Grong 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.