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 ...

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 ...

The heat index is a measure of how hot it really feels on your body when relative humidity is factored in with the actual air temperature. Since heat index values were devised for shady, light wind ...

The heat index, or apparent temperature, combines air temperature and relative humidity to indicate how hot it feels. High humidity slows sweating, the body's natural cooling system, making ...

As the heat and humidity increase this week, we will hear a lot about the heat index, especially as temperatures come close or surpass the 100-degree mark. The heat index itself is relatively new, ...

Rochester is entering its first heat wave of the summer, with an air temperature above 90 degrees expected for the next four days. The heat index will be even higher, expected to exceed 95 degrees ...

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 ...

The heat is on in Alabama, and it's only getting hotter. The heat index is expected to climb sharply from Monday, June 2, through Monday, June 9, pushing conditions into potentially dangerous ...

Heat index across several parts of Florida could get as high as 105 May 19. Several high-temperature records were broken May 16-May 18. Rain may be possible later this week, but don't expect temps to ...