heat indexheat index
a number expressed in degrees Fahrenheit, computed from the temperature and the relative humidity, and used as an indication of the apparent temperature as it would be felt by a person outdoors (Ex.: a temperature of 90°F and a relative humidity of 50% yield a heat index of 96°F)
A measurement of the air temperature that factors in the effect of relative humidity, used as an indicator of the perceived temperature. Also called humiture .
(plural heat indices)