Jefferson County, West Virginia

Jefferson County is the easternmost county of West Virginia. As of the 2010 census the population was 53,498. Its county seat and largest city is Charles Town.
Climate.
Jefferson County is located in a Humid subtropical climate. It has varying temperatures with an average high of 86 degrees in July, and a low of 22 degrees in January. Jefferson County receives rainfall all year, with summers being wetter that winter. It receives 20 inches of snow a year on average. Jefferson County also receives 39 inches of rain per year.