I few days ago, I placed a UV-5r on top of a 4x4 fence post while I was working on the pool and forgot about it. That night, we had a legit severe thunderstorm -- even got a tornado about 3 miles away. Two days later, I found it still lying on the post. I picked it up, carried it in, gave it 2 days to dry out, and it works just like it did before it got wet. Obviously, you can't count on that, and I wouldn't expose a UV-5r to rain intentionally, but still, I was pretty impressed.