I thought (and I am sure someone will correct me if I am wrong) that these types of problems occur in mountainous areas because the resolution of the MeteoBlue snow coverage data isn’t high enough. You get the same sorts of problems in the northern hemisphere in summer when flying in the fjords along the BC coast and Alaska. I have seen snow all the way to the valley bottoms there in July, even though there’s often no snow in those valleys, even in the dead of winter. There will still be snow there on the 10,000+ foot high mountains in July, but not in the valleys. MeteoBlue just says: “Meh, there’s snow here. Good enough.” That said, I do agree that it’s a bug. Trouble is, they can’t just go by temperature, because you can have left over snow on the mountaintops in summer, even though it’s 20 degrees Celsius up there.