This is my first year keeping and I am worried about my hives making it through winter here in South Carolina. The number of bees is low compared to what there was mid summer; I am wondering about combining the hives. What is the amount of bees necessary to survive the winter. I have enough honey stores (probably), and have about 3 deep frames worth (double sided) filled with bees per hive. I have not done any medication. Any thoughts?