Good point Mike! We've had relatively mild winters since we built our greenhouse in 2016, and the snow slides off easily with a 45 degree roof pitch. I always secure my 2 roof vents for the winter so they don't blow open. However, in that huge snowstorm in early February, the snow built up before it slid off...catching and dislodging the plexiglass panel on one of my roof vents. I was able to secure it back using bungee cords for the time being, but now I have a repair I have to do.
