 According to the Köppen Climate Classification system, Blytheville has a humid subtropical climate, abbreviated "Cfa" on climate maps.As of the 2010 United States Census, there were 15,620 people living in the city.The racial makeup of the city was 55.9% Black, 38.8% White, 0.2% Native American, 0.8% Asian, 0.1% from some other race and 1.2% from two or more races.