Heat exhaustion is strongly related to the heat index, which is a measurement of how hot you feel when the effects of relative humidity and air temperature are combined. A relative humidity of 60% or more hampers sweat evaporation, which hinders your body's ability to cool itself.
Statistics (2015) Jacksonville International Airport (IATA: JAX, ICAO: KJAX, FAA LID: JAX) is a civil-military public airport 13 miles (21 km) north of downtown Jacksonville, in Duval County, Florida. It is owned and operated by the Jacksonville Aviation Authority.
Jacksonville metropolitan area. The Jacksonville metropolitan area, also called Greater Jacksonville or Metro Jacksonville, is the metropolitan area centered on the principal city of Jacksonville, Florida and including the First Coast of North Florida. According to the 2010 United States Census, the total population was 1,345,596, with a 2016 estimate of 1,478,212.