Ghost shifting - only when wet ?

I re-indexed my gears a few weeks ago and they were working perfectly until yesterday.
It was pissing down yesterday and I noticed a lot of ghost shifting on the rear derailleur. This happened going up in gear and down...
I was going to re-index them again, but I went out on it today and the gears are working perfectly again... very odd.
Is there any reason why I'm getting ghost shifting but only when it's wet ? ( cables were clean with no stones or sh!t clogging them up )..
Cheers
It was pissing down yesterday and I noticed a lot of ghost shifting on the rear derailleur. This happened going up in gear and down...
I was going to re-index them again, but I went out on it today and the gears are working perfectly again... very odd.
Is there any reason why I'm getting ghost shifting but only when it's wet ? ( cables were clean with no stones or sh!t clogging them up )..
Cheers
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Cheers for the reply cooldad, I'll keep an eye on it next time it rains and check the chain/cassette to see if that's what's going on..
Dmont