Detect rain?

[Backplague]

Is it possible to detect if its raining? Preferably give out a redstone signal.

[SinXX]

The only thing I can think of is hook up a light sensor and a timer. If the timer states that it should be night time then the light sensor wont go off but if its day time and not enough light is getting through (due to storm clouds) then it's raining - unfortuantly this won't work at night. The other problem with this is if you change the time manually, I don't know the ramifications to the timer. Good luck.

[RinValak]

You might be able to do something with a light-detector from redpower. I haven't tested it but in theory it gets darker when it rains so...

EDIT: ninja'd by minutes

There's a rain collector in Forestry mod that can do it i think, but I think that's only Technic.