Atmosphere
Part rain, part other stuff. I imagine this is what people thought the atmosphere was made out of thousands of years ago.
Imagine looking up into the sky, trying to figure out what the atmosphere up there is made out of. Your only lead: It's raining, a lot. So, the atmosphere must be partly made of rain, and it's just falling down.
ふん
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The reading for this kanji is actually the same as 分s. One trick about complicated kanji is they often take the reading of one of the pieces that they're made from. In this case it's 分, which is cool.
Also, studying the atmosphere is a ton of fun (ふん), if you're into that sort of thing.