In the shade!
Two weeks ago, with daytime temps in the high eighties and low nineties every hive in this yard had enormous beebeards. These three tristory nucs were the worst. Today at well over 100, in full sun….no beards.
Here’s the way I understand it. Beebeards are a collection of foraging bees who have no work to do…end of nectar flow, time of day…whatever. Rather than add their biological heat to the inside of the nest, they stay outside. Makes sense…right? Today with triple digit temps…they have work to do. They are collecting water. Those miniature tankers return to the nest and deposit water droplets throughout the hive. Other bees circulate air and the evaporating water actually cools the nest. Pretty smart those bees.