Re: How hot is too hot?
You may find this useful:
Originally Posted by mhorowit
How can you have too much ventilation? Isn't ventilation a good thing?
Above 93 degrees, this beekeeper is not motivated to suit up, and looks for something else to do.
Answer: Of course in the winter, too much ventilation means too much heat loss. But even in the summer the bees are cooling the hive by evaporation, so on a hot day the inside of the hive may be cooler than the outside air. So too much ventilation could result in the bees being unable to maintain a cooler temperature inside. When wax heats up past the normal operating temperatures of a hive (> 93 F) it gets very weak and combs can collapse.
USDA Zone 7a - elevation 1400 ft