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

What is heat index and how does it affect how stifling excessive heat feels?

New York state has entered its first heat wave of the summer - with highs expected to soar into the upper 90s and even past ...

The heat index shows how humidity makes hot days feel hotter, and why direct sun can push dangerous conditions even higher.

A standard load of washing contains three to four litres of water, and that moisture has to go somewhere.

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

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

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 ...

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 ...