high of around . Winters tend to be mild to cool, decreasing in temperature at higher elevations. For areas outside the highest mountains, the average overnight lows are generally near freezing. The highest recorded temperature was at Perryville on August 9, 1930, while the lowest recorded temperature was at Mountain City on December 30, 1917. While Tennessee is far enough from the coast to avoid any direct impact from a hurricane, its location makes it susceptible to the remnants of tropical cyclones, which weaken over land and can cause significant rainfall. The state annually averages about 50 days of thunderstorms, which can be severe with large hail and damaging winds. Tornadoes are possible throughout the state, with West and Middle Tennessee the most vulnerable. The state averages 15 tornadoes annually. They can be severe, and the state leads the nation in the percentage of total tornadoes that have fatalities. Winter storms such as in 1993 and 2021 occur occasionally, and ice storms are fairly common. Fog is a persistent problem in some areas, especially in East Tennessee. Cities, towns, and counties Tennessee is divided into 95 counties, each of which has a county seat. The state has 340 municipalities in total. The Office of Management and Budget designates ten metropolitan areas in Tennessee, four of which extend into neighboring states. Nashville is Tennessee's capital and largest city, with nearly 700,000 residents. Its 13-county metropolitan area has been the state's largest since the early 1990s and is one of the nation's fastest-growing metropolitan areas, with about 2 million residents. Memphis, with more than 630,000 inhabitants, was the state's largest city until 2016, when Nashville surpassed it. It is in Shelby County, Tennessee's largest county in both population and land area. Knoxville, with about 190,000 inhabitants, and Chattanooga, with about 180,000 residents, are the third- and fourth-largest cities, respectively. Clarksville is a significant population center, with about 170,000 residents. Murfreesboro is the sixth-largest city and Nashville's largest suburb, with more than 150,000 residents. In addition to the major cities, the Tri-Cities of Kingsport, Bristol, and Johnson City are considered the sixth major population center. Demographics The 2020 United States census reported Tennessee's population at 6,910,840, an increase of 564,735, or 8.90%, since the 2010 census. Between 2010 and 2019, the state received a natural increase of 143,253 (744,274 births minus 601,021 deaths), and an increase from net migration of 338,428 people into