Why is finding an Eastern Kingbird in northern states like New York in November considered a rare event?

Answer

They are typically migrating south during that time

Because they are neotropical migrants, the bird is truly rare or entirely absent for roughly six months of the year in the northern range; a November sighting usually represents a bird lingering too long before its flight south.

Why is finding an Eastern Kingbird in northern states like New York in November considered a rare event?
speciesbirdabundancekingbird