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Based on the total thermal resistance required by a human model to effect equilibrium, a scale is prepared showing apparent temperature for any combination of dry-bulb temperature, vapor pressure, wind speed and extra radiation likely to be encountered meteorologically. Application to normal midday climates of the United States shows that dry-bulb temperature is modified by the three other variables by from −5 to +7 K. However, multiple linear regression indicates that dry-bulb temperature correlates most strongly with apparent temperature, and provides simple computing formulas.
Robert G. Steadman (1984) studied this question.