40 feet? wow that is a lot of snow. I would have thought that the snow would melt once it hit the ground too. I remember reading that one of the waterfalls completely freezes over and you can ski up and down the trail to take a look at it.
Yellowstone National Park straddles the continental divide of the Rocky Mountains. It’s location in Wyoming is inland North America, and it is also high elevation. Yeah, it snows, and yeah, it gets really cold.
Cold is not a problem during the summer months at all, though there have been exceptions and it has snowed in the summer. That’s not common though. It can be pretty brisk in May and September, so timing is key.