They keep their hives at about 35C, which is white noticeable when you open them up. Same goes for big clumps of bees. Angry ones balling a invader are considerably hotter it seems, and this article mentions 49C. I’ve seen other article noting that bees die at about 51, while hornets die at a fractionally lower temperature. https://www.newscientist.com/article/dn12649-honeybees-gang-...