Along the migration pathway, some observers are starting to report about the falling temperatures hummers are encountering. When temperatures drop, a hummingbird fluffs it feathers to trap small pockets of air that are separated from the outside and warmed by the bird's body heat from within. The trapped air insulates the bird from the cold. The combination of trapped air and feathers is a much better insulator that feathers alone.
As temperatures drop, bring your feeders inside at night and put them back out early in the morning filled with room-temperature sugar water.
Amy Evoniuk