I would love to see each zone have their own weather random weather patterns. Most zones have zero weather which, disappoints me. Lotro seems to have a very good weather system.
The sky has always been one of my major issues too, look at Lotro and Vanguard's skies for inspiration.
I haven't looked into our weather system a whole lot, but when I get there I'll be sure to see how the system works
across zones, as well as gaze at the glory in LOTRO and Vanguard for inspiration, hehe.