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the bees should cluster in the center of the hive boxes and by moving their wing, they will keep the inside of the cluster, where the queen is located, at about 92 degrees, regardless of the temperature outside.  The trick is to be sure they have enough food for the winter.  I went into the winter with 4 decent hives and right now it looks like I may have lost 2 of them.  I didn't pull much honey off of them, but probably should have dumped a sack of granulated suger into a pie pan placed on top of the trames.  That would have given them access to more food, even when the weather was too cold to fly.  The next day that the temperature is above 45 degrees, I will open them and see what is left.