Something clicks while pedaling My road bike with square taper Chorus crankset has developed a click when pedaling. The click happens always in the same pedal position, right crank forward, on both chainrings. Since the noise started, I have reinstalled the cranks, tightened chainring bolts, and replaced the seatpost, pedals and wheels. 

The bottom bracket rotates smoothly when cranks are not installed or without chain. The click only occurs when pedaling with force, and happens when standing up so it very probably is not the saddle or seat post.

The most mysterious part is that the click goes away in rain or even humid weather. Any ideas?

EDIT: Since this got a "popular question" badge and duplicate, situation update: Since I posted the question, I have switched pedals a couple of times and replaced the chainrings. The click remains the same.
A few things to do to isolate the problem to the bottom bracket:


Make sure you also hear the noise when standing up (Yes, I know you replaced the seatpost, but it might be the seat. Maybe.)
When you pedal hard, you also exert more force on the handlebar. Try yanking the handlebar every which way while stopped. See if you hear anything.
A while back I had a frame with a crack in it, and I'd hear a creaking sound when pedaling hard, always from the same pedal position. But, a clicking sound like you're describing probably wouldn't come from a frame fracture.


Bottom brackets (especially cartridge units) can make strange sounds when they're starting to wear out (even if they feel fine). That's what my money's on.