The heat index, also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.

Sometimes the temperature outside feels warmer than it is, and there's a reason. Here's a breakdown of the heat index.

Sometimes the temperature outside feels warmer than it is, and there's a reason. Here's a breakdown of the heat index.

It's because of something called the heat index. The heat index measures what the air temperature combined with the level of humidity feels like to the human body, the National Weather Service says.

When you hear the term “heat index” in the forecast, it’s usually paired with a much higher number than the actual ...

According to the National Weather Service, the heat index is what the temperature feels like to the human body when relative humidity is combined with the air temperature.

Basically, when the body sweats, the perspiration evaporates, cooling the body. When the humidity is high, the sweat doesn't evaporate as quickly and the body doesn't cool itself as well. Therefore, ...

According to the National Weather Service, the heat index is what the temperature feels like to the human body when relative humidity is combined with the air temperature.

The heat index is what the temperature feels like to the human body when relative ... Extreme danger: When the heat index is 125 degrees or higher, heat stroke is likely. Here's a chart to help you ...

Typically, the heat index will be above 100 degrees and the nighttime air temperature will not drop below 75 degrees. However, the criteria vary by area.