Dry bulb temperature is the temperature that is read by the sensing element on an ordinary temperature sensor or thermometer. Dry-bulb temperature does not take into account the effect of moisture in the air.

The wet bulb temperature takes into account the effect of moisture in the air and its effect on the sensing element of the measuring temperature sensor or thermometer. The evaporative effect of moisture is reflected in the wet bulb temperature as it is cooler than the dry bulb temperature.