Artemus is a census-designated place in Knox County, Kentucky, United States. The 2010 United States Census reported that Artemus's population is 590, of which 572 persons are white and 5 persons are black.The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Artemus has a humid subtropical climate, abbreviated "Cfa" on climate maps.