Temperature wise, cooler air will be moving into the Northeast but should rather seasonal. The Southern Half of the nation should find mild to warm Thanksgiving temperatures while a mild to cool day should arrive for the Midwest/Great Lakes. A cool to chilly holiday is likely for the Northern Plains and Upper Midwest while the Northwestern U.S. should be cool as well. Where snow is to fall over the Rockies, chilly to cold air will drop in to the Intermountain West. Even those areas where the cold air will be in place, quite a bit of sun should make it feel a little nicer over a vast majority of the country.
From all of us here at WeatherNation, we wish you and your family a Happy Thanksgiving!