Hi there this is really weird but while I was building in the 1.12.2 It started Raining in the Tardis Dimension. The only mod i was using at the time other than the dalek mod was Better PvP 

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This is my evidence

Try to use this link to download the newest version of  The Dalek Mod U47 and let us know if you still having the rain bug. 

Ok thanks no more rain! Also I like your new profile Dutch!

No Problem and thanks!