Wind, a lot of PIP users live in Manitoba. In fact, QuietlyDying and I both live in Winnipeg, the capital of Manitoba. Sure it gets cold here, but not the coldest in Canada. Still more than you could handle, though.
As for muses, I guess you could call them that. I don't have voices that whisper in my head.... actually I DO, and they're always just saying things I've heard before, cliches and whatnot. So I actually try to dodge the voices in my head when I write and do so with as much objectivity as possible.
But if you mean a state of inspiration, then yes, those come and go. I wouldn't name them, though.