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?

Delaware heat wave could push highs near 100 with steamy humidity. Here’s when temperatures finally drop.

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

Florida has a well-earned reputation for its muggy, humid summers. Which heat is worse: Florida's "wet blanket" or Arizona's ...

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

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 ...

The Aspen Acres fire burning in southern Colorado raced across more than 17 square miles overnight, forcing ...

As summer temperatures rise, dairy cows are at greater risk for heat stress. Heat-stressed cows suffer from reduced dry ...

This resource is suitable for weather topics for primary school learners. Have you ever felt hot and sweaty even when you haven't done any exercise? That might be because of humidity. But what is ...