Just bear in mind that with snakes, a significant drop in temperature (day or night) tends to signal a seasonal change to them, which is their cue to stop eating. This is instinctive- as they evolved in nature, snakes that failed to stop eating when it was too cold to complete digestion could get sick & even die from rotting food in their digestive system- snakes evolve behaviors for very good reasons in terms of their survival.
What I cannot tell you is exactly what temperature drop is enough to make your snake say "Whoa, it's winter!" and refuse food. Just like anything else, some are more sensitive than others.