from my experience the temperature is that inside the hive. It gets
quite hot here in a few weeks time (up to at least 43C) and that is
when we see bees abscond. The colonies that leave are the ones where
the sun got through the trees to shine directly on the hive. If you
take the box apart after the event you find that the wax comb is
remarkably soft, touch it and it will distort.
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