Why not?
Dynamic map: fog reduces field of view
Even the rain but less than the fog, and can make the ground more muddy (speed malus to the units)
Small paths possibility of malus to the formation (or wider formations, not practicable)
Possibility of ambushing strategies).
Some maps are typically more rainy / foggy / sunny than others.
Obviously, details that affects speed of units, to be visible and affect the gameplay, the maps must be great (like aoe2).
Multiple levels of depth (user-selectable) are necessary as well, if you don’t want it to become a niche product, and too complex for everyone.
For me these are good ideas.
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