Good news, only about 30% of Skyrim is snow all the time. The rest is tundra, forests, canyons, and marshes. It will still snow, though. It's just won't be permanent in those locations.
I like that there are other regions with varying environments, but hopefully all of the areas are pretty cold. In other words, I'd like to see my breath most of the time I think. Seems only natural since it's all the same basic area. I don't think I want what the OP wants, which is to say I don't want to be wandering around with shorts, a tank top, and some shades if you get what I'm sayin. B)
Skyrim isn't going to be all snow, both the trailer and many of the screenshots show locations with no snow visible. At least, the game won't all be covered in permanent snow, since it features dynamic snow, in other words, the game simulates snow accumulating on the environment, we can probably assume that many areas won't have permanent snow, but may still see snow fall when the weather warrants it.