Drive belt noise ( again ) !!!!!!!!

I know this topic has been hashed over & over , I find it strange that from day to day riding the belts acts differently . Lately the weather has been cool , very little belt noise . This wasn't the case 1 1\2 mnths. ago on a hot summer day that belt made all kinds of racket ? Does temp. really effect the final drive that way ? Just Rapp'in !!!!!!!!!