Think deserts, for example. The heat index equation works using dew point or relative humidity along with temperature, but dew point is easier to understand. When the dew point is high ...

Dew point measures the air’s moisture content directly and impacts weather perception more accurately than relative humidity.

A mathematical equation takes air temperature and dew point to produce a humidex or “feels like” temperature. A heat index is much the same but often uses relative humidity to determine how it ...