[Magesmiley]

I'm assuming the is a Classic question.

(Mods should move this thread to the Old Editions forum probably.)

Keep the game's time scale in mind. I suspect that rain/snow isn't going to dissipate a smoke cloud too much in a minute, much less the time for paint to dissipate.

We applied weather as a separate category for worst modifier than the cloud dropped weapons category, as it was a general effect that applied to the entire battlefield, rather than just the area of the dropped weapon. So the penalties stacked, just like if you fired through a longer distance of smoke (or multiple smoke clouds).