[Bluegunner]

I don't think that rain or humity in and of it's self is bad. But when a chick becomes chilled their chance of survival drops. A chick that gets wet but gets dry quickly shouldn't have a problem. Also a warm rain should have less effect on the chick than a cold rain. A long period of constant slow cold rain with little sun shine would be harder on the chicks than short cloud bursts or slow warm rains with sun shine inbetween. lastly, humidity and warmth conditions would increases the bug population and that's a positive for young chicks.