I'm having some condensation issues with my 2 hives this winter. The hives have more bees than last season going into winter and I'm wondering if this is contributing to the problem. After a below freezing night and then with the sun shining on them in the morning water was dripping out of the entrance and a small puddle (really just a wet spot) was observed below the drip. The hive with the most bees (and the most dripping) has a top entrance at the rear (that the bees created) between a gap in the bars as well as the bottom front entrance. I thought this would help with ventilation so I allowed it to remain.
What is the solution? How do Langstroth hives address this? Are my hives at risk because of it? I'm in NW Lower MI on the 45th parallel where winters are long and harsh.