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

The monsoon may bring rain, but rising humidity, warmer nights and urban heat are making Indian cities feel hotter than the ...

Much of the U.S. is under a blanket of oppressive heat as people prepare for a sweltering July 4th holiday. It’s during times like these that you often hear people talk about the “heat index” when ...

Most people know that air conditioners dehumidify the air while they make it colder, but are they able to outclass ...

What is the heat index? Learn how humidity makes temperatures feel hotter, why it matters during New York's heat wave and when heat becomes dangerous.

At 10:52 a.m. on Monday, the NWS Spokane WA released a red flag warning valid for Wednesday between 11 a.m. and 10 p.m. for ...

At 10:53 a.m. on Monday, the NWS Pendleton OR issued a red flag warning valid for Tuesday between 1 p.m. and 10 p.m. for ...

The oppressive air mass will likely linger into Friday, though showers could bring some some relief.

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

A nine-year-old from Kennewick has just set a new kid's world record for holding the longest plank.

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 ...