Greetings!
I was in my building world were i test redstone machines and structures of future projects, and in the real world (the one i play) I live in the top of a mountain, and it was snowing up there, I gave no atention but then I forgot how i would build my house and went to the other world, after a minute I relogged to my world and suddenly all the snow had maps of the landscape, I went to a forest to see if the rain had the same problema but no, only the snow, in 15w32c didnt happend, AND when you go to 15w33b, the snow is normal again, I tried to replicate it doing the same thing i did, but nothing, the snow is normal.