The temperature on any given summer day may be in the 80s or 90s. So why does it feel so much hotter and oppressive at times? That's the heat index doing its thing. Here's how it works: What is the ...

During the hot, humid summer months, meteorologists often discuss the heat index instead of the actual air temperature. But how is the heat index calculated, and why is it more important than the air ...

A temperature of over 100 degrees doesn’t paint the whole picture when it comes to determining how hot it feels. The heat index does. What is the heat index? “It is essentially what temperature feels ...

Checking the temperature reading during a heat wave won’t tell the whole sweltering story. It’s going to feel a lot hotter. Blame the heat index, also called “apparent temperature.” It’s a combination ...

When we talk about climate change, we most often talk about changes in air temperature—and with good reason. The rapid rise in global and U.S. average air temperatures is a direct result of climate ...

Extreme levels of heat and humidity are forecast to spread across the country over the next two weeks, blanketing the Southwest, Midwest, and East Coast with high temperatures beginning this June 19 ...

Checking the temperature reading during this weekend’s heat wave won’t tell the whole sweltering story. It’s going to feel a lot hotter. Blame the heat index, also called “apparent temperature.” It’s ...