Raining Glitch

Hello, I've been having trouble with my Minecraft since I first installed the big update last year (2015, around Augusts) I just l left it there without reporting the problem.

On my friend's iPad it doesn't rain when she's inside her buildings (such as house) but on mine, no matter where I am: in the cave, in my house and anywhere that have something above my head, it always rain, as if there's no house or anything there. I didn't want to redownload it because I don't want to lose all my worlds there.

I also made a big dome (igloo) for my snowmans so they don't die but they still end up dying because of the rain. It's pretty annoying, I thought it might be fixed in later updates, and I thought some people might have the same problem, but no, i really want it fix. Well I hope it'll be fixed soon

Thanks