"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 ...

Conditions are hot and humid in Michigan and getting hotter as the week goes on. Forecasters often refer to the heat index as a way to measure the "feels like" temperature. Here's a look at what that ...

What does the "heat index" mean and how does it apply to people? -- S.S., Tulsa. The World Almanac and Book of Facts, updated annually, always includes the heat index ...

South Carolinians are all too familiar with muggy summer days. Check your weather app of choice and you’ll notice humidity presented as a percentage: 68 percent humidity, 92 percent humidity, ...

National Weather Service observations at Lehigh Valley International Airport show the heat index entered the triple digits Monday morning. What’s that mean? Well, it’s hot, of course — as anyone can ...

Heat advisories have been issued for various parts of Florida, urging residents to take precautions. Dangerous heat is expected on Florida's Treasure Coast, with predicted heat index values from 109 ...

The heat index is a measure of how hot it really feels on your body when relative humidity is factored in with the actual air temperature. Since heat index values were devised for shady, light wind ...