The number on the thermometer only tells half the story. Here’s what to know about heat index—and why some scientists are rethinking how it is calculated.

Whether a summer day is great or awful often comes down to the humidity.

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 ...

Some hot days feel even worse thanks to high humidity, trapped heat and dew points. Cities are especially vulnerable. By Nazaneen Ghaffar Nazaneen Ghaffar is a reporter on The Times’s weather team. It ...

The heat index is a measurement that considers both air temperature and humidity to determine how hot it actually feels to ...

Relative humidity and dew point are both used to identify how much moisture is in the air. Relative humidity is a percentage ...

Heat waves are becoming commonplace, and so too is high humidity, which can strain the electrical grid, hurt the economy, and endanger human health. But the global prevalence of record-breaking ...

Wet bulb temperatures so more than just tell you how hot it is; it also informs you one your body's reaction to heat.

The thermometer says one thing, but Alabama heat feels like another. What’s really happening when summer air becomes so hard to escape?

Weather officials include "feel like" temperatures, also known as apparent temperatures, in their forecasts to show how heat ...