I think your snake just wasn't hungry. I doubt a 2 degree difference in your tank and what care sheets tell you it should be, will cause your snake to go off food. It is winter and some snake do stop eating, other will slow down. Don't stress over a missed meal or two. I've got a finisky Albino that will not eat for a month, then he'll pound them for some time, then not eat for a week or two. The way I look at it, snakes don't eat out of boredom, they eat when they're hungry. You snake will eat, when it's ready.
Good Luck!
Jim Smith