Michigan's heat wave this week will feel even warmer because of high humidity. Here's how the heat index works.

Exercising outside in high temps can be a health hazard. Here's how to read your local index, according to a doctor, so you ...

Florida has a well-earned reputation for its muggy, humid summers. Which heat is worse: Florida's "wet blanket" or Arizona's "furnace"? What does heat index really mean? Heat-related symptoms to watch ...

While you should remain in an air-conditioned room during the heat wave, if you do go outside you should do the following: ...

Today's extreme heat for the World Cup match between Portugal and Croatia is expected exceed world soccer union guidelines ...

The metric of how hot the air actually feels has roots in a 1979 journal paper called “The Assessment of Sultriness.” By Andy Newman In recent days, you may have seen or heard many mentions of a ...

When working with animals, look for signs of heat stress they may exhibit. As summer temperatures rise, dairy cows are at greater risk for heat stress. Heat-stressed cows suffer from reduced dry ...

What is the heat index? Learn how humidity makes temperatures feel hotter, why it matters during New York's heat wave and when heat becomes dangerous.