Fish spawns

[Thorny]

I am curious about fish spawn timing. I know time of year and water temperature are the biggest triggers.  I guess my question is how tied to temperature are the spawn cycles?  For example, the bass spawn starts earlier in southern Utah then central Utah as the water warms up sooner.  That said, is it as simple as saying that fish will start spawning when the water hits X temperature range with only rare exceptions?  Is that the case for most kinds of fish?