But... You have wind right? Like... Strong wind? And... Hmm... Around the Jungle Vault there could sometimes be mist right?
Yeah, that's one thing I won't miss when I move back to Michigan, the wind. I don't easily frighten, but it's been bad enough here I was really spooked, and I've been through tornadoes back in Michigan.
It's also quite possible that it doesn't rain anywhere in the Fallout universe, a side effect of the near total destruction of the entire planet.
As I said before, I'd really enjoy changing weather if it was done the same way it's being done in GT5. There's a chance for all types of weather, but never guaranteed weather. The randomness would go a long way to helping immersion.