The snow coverage data comes from Meteoblue as well. You can use their snow coverage map to see where there should be snow and how much.
I have a suspicion though that it uses the coarsest global coverage data instead of the more local, precise one.
You can see what happens if you zoom out this far: Wetterkarten - meteoblue
The entire area seems to be covered in snow. However if you zoom in close enough
You get where there is supposed to be snow.