The fog in that orc city battleground feels amazing, if we could have those big impactful weather in overland areas, they would make the overland more interesting, and more diverse:
For example:
Snow storm in northern area
Ash storm in vvanderfell
Sea storm in southern, mostly Elsewhyr and summerset
Fog in mountain area
Heavy rains around the central area
some weird clockwork city weather
etc. We are probably not getting seasons, but extreme weather from time to time in overland might sounds fun (And provide another fun occasion sometimes when you fight an overland boss)