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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.
12 maj 2022 · The Heat Index Equation. The computation of the heat index is a refinement of a result obtained by multiple regression analysis carried out by Lans P. Rothfusz and described in a 1990 National Weather Service (NWS) Technical Attachment (SR 90-23). The regression equation of Rothfusz is.
25 sie 2023 · Learn how to calculate the heat index using dew point temperature or relative humidity and air temperature. Find the heat index chart and forecasts for different regions and seasons.
28 maj 2024 · Learn what is heat index and how to calculate it based on temperature and humidity. Use the calculator to find out the felt air temperature and check the heat index chart for different conditions.
Calculate the heat index based on air temperature and relative humidity using a simple formula and a chart. Learn how to use the calculator and the factors that affect the heat index.
Learn how to compute the heat index, an apparent temperature that reflects the combined effect of temperature and humidity, using a regression equation and adjustments. The web page also explains how to estimate the daily mean heat index from the maximum and minimum values.
Learn how the Heat Index (or apparent temperature) is derived from a complex model that involves many parameters and assumptions. See the equation that approximates the Heat Index based on temperature and relative humidity, and the nomogram that summarizes the results.
