Originally Posted by
bmalmquist
^ That actually is a pretty good explanation. Maybe, if it's really hot and you're using a thinner lube, it could be viscosity differences?
Not really. I don't think the OP is riding from winter to summer everyday.
Also conveniently forgetting the fact that noise usually does not come from where it sounds like it's coming from. The prevalency of threads like "Help my bike makes ____ noise" should tip you off.
http://sheldonbrown.com/creaks.html
Actually it's a waste of time to even speculate given the amount of information that is presented, which is jack all.