Back on DR, bad weather (snow, sleet, rain, etc) would wreck your musical instruments if you had them outside of containers. The damage was reparable, if you had the skill or knew a Bard who did, though. I don't remember if it really did anything else. I think fog made it difficult to see what was in the room...but I'm not sure and I could be wrong. I never really looked outside the Bard class though, so I haven't the faintest clue what else weather might've affected.
Moon Mage spells, maybe?
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