Below is the official chart the National Weather Service uses to calculate the heat index, based on the temperature versus the relative humidity percentage.

A rising minimum Much of the U.S. saw record-breaking heat, including daily records. But larger trends are seen in the minimum temperature.

You’ve probably heard the phrase “it’s not the heat, it’s the humidity,” but according to the National Weather Service, it’s really both.

The temperature on a summer day may be in the 80s or 90s. So why does it feel so much hotter? That's the heat index. Here's how it works.

The heat index is used to calculate not the actual temperature of the air around you, but instead how hot you feel. This all comes down to sweat.

As Europe endures another wave of sweltering heat and out-of-control wildfires this summer, experts are sounding the alarm over heat stress.

Austin's weather is blistering this summer, excessive heat explained in four charts Amethyst Martinez Maddie Scott Austin American-Statesman 0:05 ...

Here’s a breakdown of Austin’s weather patterns for 2023 explained in four charts: 1. Austin's average temperatures rise above normal in past month From May 2 to June 20, the National Weather ...