Earth day brought 48°F for the high temperature, and my first swarm call of the year that I could comfortably drive to. The swarm issued from a tree that has had a honeybee colony in it for a few years. Despite the cold, the bees were relatively well-behaved, and went right into the hive. I noticed several other trees that looked hollow on my way off the property. I expect to return in a few days for secondary swarms.