When did scientists explained rain? And who?

Question

Like who and when came up with the conclusion that rain is condensed water that falls from the cloud and blah blah blah. Thank youu <3<3

Answer 1

Cave men were more than smart enough to work that out.  Unlike a vast number of people around today.

Answer 2

That persons name is lost to history - it probably occurred before history was recorded.

Answer 3

Back when man first became bipedal.