Hi lmans:
It depends on the species. Birds like Yellow-rumped, Palm, Cape May, and Magnolia will be washed out compared to their spring equivalents. American Redstart, Prairie, Black-throated Blue, Worm-eating, Ovenbird, Northern Waterthrush, and others always look the same.
Remember, all the diversity (22 species this year) is in SE Florida -- mostly in tropical hardwood hammocks, suburban parks, and gardens.