I ride for exercise and pleasure, so temp/humidity aren't really important. I've ridden through snowstorms in Michigan, and hot humid days in Houston. Here in Central CA you pretty much accept its going to be over 100 all summer.

Cold was never a problem if you were dressed for it. Humid days well over 100 were no problem as long as you kept moving, you had a breeze. The only trouble I have over 100 is sweating all over the inside of my sunglasses and not being able to see.

Now if keeping a certain pace is critical to you, temp matters. I never worried about it.

If I were commuting,weather matters much more. I have never commuted on a regular basis. My job makes it difficult.

I do know there is nothing like riding at dusk after a hard ride as the temp starts to drop and a breeze comes up. Best time of day to be outside. Then a cold beer on the patio looking at the mountains. Awesome.