For the last several nights my bees have been out late. They are in a tight cluster around the entrance, feeder, and up the east side of the hive. What is going on? It has been hot and humid here in Atlanta with a nice rain shower most afternoons. Are they hanging outside the hive to keep cool? Are they too crowded? Do we need to add more housing / super? See the attached iphone picture taken at 11:00 PM?