Honey bees can maintain 92-94 degrees F inside their winter cluster, even in freezing weather.

Once Apis mellifera returns to brood raising after its winter brood break, the workers must maintain temps in the low 90s F to keep eggs, larvae and pupae alive. An Apis mellifera colony maintains its body temp in winter, not going into hibernation or dormancy or lowering body temp to survive, but staying active and actually generating and holding heat with a clustering behavior unknown in other insects. At the center of the cluster, the queen must be kept close to 68-70 degrees F and once she lays and the workers start raising those eggs to larvae and pupae, the brood must be kept at the low 90s F.