5 Will there be seasons?
I doubt it. Nirn has seasons, or at least references to seasons, but I've never seen any indication that they are as extreme as those of Earth. I also don't think Nirn is tilted on its axis, nor does that matter if it is because the Sun is not a giant ball of fire but a giant gate to Aetherius. The proximity to the Sun probably has more to do with how much magicka can be used rather than anything to do with weather or climate. There are references to winter being cold and things like that, but nothing about snow in winter, trees and things dying in autumn, or things like that, and it's possible to go years in Oblivion and Morrowind without seeing anything like that. So I don't think seasons quite work that way in Nirn like they do in real life.
Edit: I guess Daggerfall had seasons?