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  1. Dictionary
    Heat in·dex
    /hēt ˈinˌdeks/

    noun

    • 1. a measure indicating the level of discomfort the average person is thought to experience as a result of the combined effects of the temperature and humidity of the air.

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  3. www.rd.com › article › heat-indexWhat Is the Heat Index, and How Does It Differ from the ...

    Jul 11, 2023 · The National Weather Service defines the heat index as the apparent temperature, or “what the temperature feels like to the human body when relative humidity is combined with the air...

  4. www.epa.gov › climate-change-indicators-heat-wavesClimate Change Indicators: Heat Waves | US EPA

    Nov 1, 2023 · It shows the U.S. Annual Heat Wave Index, which tracks the occurrence of heat wave conditions across the contiguous 48 states from 1895 to 2021. This index defines a heat wave as a period lasting at least four days with an average temperature that would only be expected to persist over four days once every 10 years, based on the historical record.

  5. www.nbcwashington.com › weather › weather-storiesWhat is the heat index, and how’s it different from the ...

    Jul 27, 2023 · The heat index, or the "feels-like" temperature, is what it feels like to the body when humidity is combined with the heat.

    • 2 min

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  7. www.noaa.gov › jetstream › synopticHeat Index | National Oceanic and Atmospheric Administration

    With an air temperature of 108°F (42°C), the heat index was 178°F (81°C). In looking at the basic climate regions around the world, we can see that there are some places where the weather is considered hot.

  8. abcnews.go.com › US › WeatherWhat is the heat index and why is it important? - ABC News

    Jun 29, 2018 · The heat index is a calculated temperature value of how hot it really feels when the amount of moisture in the air is factored in with the actual air temperature outside. This value is calculated by taking the relative humidity or dewpoint value for a specific location and factoring it into the air temperature reading.

    • 1 min

  9. www.weather.gov › safety › heat-indexHeat Forecast Tools - National Weather Service

    The Heat Index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature. To find the Heat Index temperature, look at the Heat Index Chart above or check our Heat Index Calculator.

  10. www.wusa9.com › article › weatherWhat is the heat index? Here's what it means | wusa9.com

    Jun 29, 2021 · In basic terms, the heat index is what the temperature feels like thanks to the moisture in the air.

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