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This calculator estimates heat index temperature felt by the human body based on the actual measured air temperature together with humidity level or dew point.
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Use this Heat Index Calculator to calculate the heat index (HI) based on air temperature (T) and relative humidity (RH). How to use this calculator. Choose the temperature unit between degrees Fahrenheit, degrees Celsius, or Kelvin. Enter the air temperature.
Heat Index is calculated using this formula: where T - air temperature in Fahrengeit and RH - relative humidity in percents. If RH is less than 13% and air temperature is between 80 and 112F, the following adjustment is subtracted from HI:
12 Μαΐ 2022 · The Rothfusz regression is not appropriate when conditions of temperature and humidity warrant a heat index value below about 80 degrees F. In those cases, a simpler formula is applied to calculate values consistent with Steadman's results: HI = 0.5 * {T + 61.0 + [(T-68.0)*1.2] + (RH*0.094)}
The formula below approximates the heat index in degrees Fahrenheit, to within ±1.3 °F (0.7 °C). It is the result of a multivariate fit (temperature equal to or greater than 80 °F (27 °C) and relative humidity equal to or greater than 40%) to a model of the human body.
The National Weather Service (NWS) uses the Steadman's equation to calculate the heat index. This equation takes into account the vapor pressure, which is a measure of the amount of moisture present in the air, and the air temperature to estimate the heat index value.
26 Ιουλ 2023 · The heat index is calculated using a complex formula that incorporates both temperature and relative humidity. The formula may vary slightly depending on the unit of measurement used for temperature (Fahrenheit or Celsius).
