Winter bees are different. First there are no drones in the wintering hives (sometimes one or two) because they are a drain on the hive resources; contribute nothing during the winter; and the queen can create them from unfertilized eggs as spring approaches.
Winter bees live longer. Summer bees live about six extremely active weeks. Winter bees in cold temperate climates may live for 150 days (Winston, p. 215). In an area like Atlanta where we typically are not a cold temperate climate, the winter bees may live a slightly shorter amount of time. In the hive during the winter, bees do die and their bodies are cleaned out when the temperatures are warm enough to fly.
Here's what it looks like around my surviving colony in my backyard:
Yet there are still thousands of bees in this hive. I have a "Billy Davis" robber screen on the hive and there are bees massed under the screened wire, just enjoying the sunshine.
Here's a closer view or two of the dead, lying en masse outside the hive.
The bees who are flying into the hive have packed pollen baskets. You might notice that some of the dead bees also have packed pollen baskets.
I am amazed at the strength of this hive and the numbers of bees who have lived here through our extremely cold winter. In Atlanta we often have a week of snow in March, so it's not over yet.