Charlottesville has a four-season humid subtropical climate (Köppen "Cfa"), with all months being well-watered, though the period from May to September is the wettest. Winters are somewhat cool, with a January average of , though lows can fall into the teens (< −7 °C) on some nights and highs frequently (11 days in January) reach . of 2010, there were 43,475 people, 17,778 households, and 7,518 families residing in the city. The population density was 4,220.8 people per square mile (1,629.5/km2). There were 19,189 housing units. The racial makeup of the city was 69.1% White, 19.4% Black American, 0.3% Native American, 6.4% Asian, 1.8% from other races, and 3.0% from two or more races. 5.1% of the population were Hispanics or Latinos of any race.