First off, the term bromate or hibernate has little or nothing to do with snakes. North or south.
Colubrids, and even most boas and pythons, prefer cool temps to shelter in and seek heat for needed tasks. Heck most kinds of snakes.
What are cool temps is the question. We often see snakes out and moving in temps from the high forties on up. So I have to wonder what 55 or 60F has to do with hibernating.
I have seen several species of boas out and active in the 50's, as well as five species of pythons from the mid fifties to 65F.
Basically, lower temps provide resting temps so the snakes can conserve energy. When its hot, even in nature, they normally do not reproduce once there are no areas to conserve energy. At these times, they normally seek food to keep moisture and energy levels normal.
In areas of extreme cold and heat, they hit the safest temps they can find. Naively, we call that hibernating or brumating.
there is no question you can offer both cool temps and warm temps year around, and your snakes will work well. In most cases, folks shut down their snakes to take a rest, not the snakes resting, the keepers resting.

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