It would be awesome if this was added to the game. However, there is one thing that I think would be a very nice addition to this feature.
Before I start: I can only base this on my own experience (obviously), and since Skyrim has a sub-arctic climate like the regions around the pole circle (Scandinavia, Canada + Alaska, Siberia...), I'm going to base my knowledge on the weather we have in Sweden, but my research shows that my statements are true for the other regions as well.
As you may know, northern countries experience a great change in the hours of daylight during different seasons. The summer nights are extremely short, the sun goes down late and the nights aren't dark. The days starts to become shorter (lightwise) during the fall though, and in the winter the nights are longer and the days are short (so it's the opposite of the summer days). Here in Sweden (middle Sweden, not the most northern part), a typical winter day has light from about 9 a.m. until about 4 p.m. (about 7 hours), but I suppose that the times are more extreme in the more northern regions. In the spring, the days starts to become longer and the nights shorter again.
The point of this topic is that I think this element of day/light balance change would be a nice addition to the seasonal foilage of Skyrim. I'm not sure if it contradicts the lore in some way, but I don't believe so. I believe this addition would make the seasonal foilage a bit more interesting, as well as it would make the difference between seasons greater. I assume that places like Winterhold will have constant snow, so I guess this would be a way to notice the change in all of Skyrim.
Do you think it would be a good idea?

