hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity.

What does a hygrometer tell us about the weather?

A hygrometer measures the humidity, or moisture content, of the air in terms of the relative humidity. This reading helps determine the comfort level of a given air temperature. The air feels more comfortable in both cold weather and hot weather when the humidity is low.

Where should a home hygrometer be placed?

Locate your hygrometer in a living area away from the moisture produced by the kitchen or a bathroom. For maximum heating effectiveness and comfort, humidity levels should be between 30% and 50%.