"It's not the heat, it's the humidity." Actually, it's both, and that's where the National Weather Service's heat index comes in. Also known as the apparent temperature, the heat index is a number ...

If you are living in one of many areas of the U.S. currently experiencing a heat wave, your outdoor thermometer may say it's in the 90s, but your local weather station tells you it feels like triple ...

The sticky combination of heat and high humidity can be more than uncomfortable -- it can be deadly. Mario Tama/Getty Images You’ve probably heard people say, “It’s not the heat, it’s the humidity.” ...

An Emory University study is chronicling the heat, humidity and air pollution Atlantans are encountering in their daily lives.