 Fredericksburg has a four-season humid subtropical climate (Köppen "Cfa"), with cool winters and hot, humid summers.Daytime temperatures for much of the year average slightly higher than in Washington, D.C. due to the southerly aspect, although the inland location and distance from the urban heat island present in the nation's capital make for significantly cooler low temperatures.As of the census of 2000, there were 19,279 people, 8,102 households, and 3,925 families residing in the city.