A cool, rainy day is also an appropriate time to move bees at any hour, so long as the bees are not flying. The entrances of hives are normally closed with wire screen while bees are in transit. Entrance screens are about 4 inches wide and as long as the hive entrance. Before loading, smoke the hive entrances and push the loosely folded V-shaped entrance screens into place. All other openings of the hive should be sealed shut.
Some beekeepers make long-distance moves without closing hive entrances.
This approach is good during very hot weather and when not traveling through large cities. Colonies are loaded during the night, with the tack engine running. Vibrations from the motor calm the bees after the colonies are placed on the truck. A better approach is to cover the entire load with netting or plastic screen. If colonies must be moved during hot weather and entrances need to be screened, additional ventilation will be needed to prevent suffocation.