A drop or two of water would evaporate pretty much immediately but I'm not going to test that theory. No a rain storm is a different thing all together and I believe it would explode from the rapid cooling. When I was a kid and first started casting slingshot pellets a friend of mine kept pouring a ladle full of lead into a bucket of water to watch it sizzle. He got brave and poured a full ladle full and it popped or maybe a minie explosion pretty good shooting hot water on him. That cured him real quick.