Every year there are late migrating passerines(perching birds). I photographed Yellow-rumped Warbler, Palm Warbler, Common Yellowthroat, Lapland Longspur, Grey Catbird and Hermit Thrush. The Hermit Thrush travels with the robins, since it is a fellow thrush after all. One winter we had a Yellow-rumped Warbler stay and survive a winter with us. Feeding overwintering birds suet is important. Upside down suet feeders are the best as they deter corvids(jays, crows, ravens) from cleaning it out.
Expect Orange-crowned Warbler, Pine Warbler, Yellow-throated Warbler and other assorted less common birds in December.