The key is fog. BF would not have to be a rocket scientist to know that if the valleys are foggy and cold, the higher elevations are sunny and pleasant. They live in the weather and are probably more adept at reading it than most of us. I have visions, during these situations, of a SW facing ridge, and BF laying out scratching, and enjoying the sun. Sure would beat weeks of rain. Also, humans are less likely to be in the mountains during these conditions which primarily happen mid winter.