During the wintertime here in the south, fortunately we frequently have warm days, with temperatures reaching in the 50s-70s depending on the region. Those are the best days to inspect your colony's condition. Now keep in mind that the bees are still quite capable of stinging even if it is too cold outside for the bees to fly. Lifting colonies from the rear is a quick method for determining quantities of honey stores. Do not rely on Boardman entrance feeders in cold weather since the bees are unable to leave the cluster in order to feed.
Hive protection is another consideration.
During times of colder weather, mice love the warm accommodations provided by honey bee colonies. To keep out these unwanted guests, it is suggested to use an entrance reducer or mouse guard. Usually guards made of metal provide the best protection since mice can't chew through them. These entrance reducers also provide protection from cold drafts. Honey bees will maintain a cluster throughout most of the year.