Gah, I can't seem to replicate Cogstar's bug, so I'll move onto that rain->clear bug next. Trouble is, I've been waiting a while for a rainy weather to turn up, but I'm getting really nice weather in game, with the odd bit of fog and cloud cover.
Guess I'll just keep waiting...
EDIT: Got one! Just bumped up the timescale till one came around. I can't replicate the bug though, so:
@ Petrus,Bloodfrozen: Can you download my http://cid-465896b69b9940e8.skydrive.live.com/self.aspx/Public/Weather%20Debug%20Ring.7z if you don't already have it, and tell me the IDs of the weathers where this happens. It would be great if I could get the weather before you enter the interior and after too - so whenever it's raining and you're about to go inside, get the weather ID using the ring, and if the bug happens, get the interior weather ID too. If you could do that then that would be great.