It's raining through blocks and you can't sleep during thunderstorms

Put the summary of the bug you're having here

What I expected to happen was...:
That blocks stops the rain from coming trougth. 

What actually happened was...:
The rain went trougth all the blocks

Steps to Reproduce:
1. Take a 1,8.8 map and start the new snapshot with this world.
2. Let it rain
3. ...