relative humidity

noun

: the ratio of the amount of water vapor actually present in the air to the greatest amount possible at the same temperature

Examples of relative humidity in a Sentence

Recent Examples on the Web

The tests were conducted in an environment with an air temperature of 72 degrees and relative humidity of 20%. —Daniel Libit, Sportico.com, 17 Mar. 2026

Winds are expected to be northwest 25 to 35 mph with gusts up to 50 mph and relative humidity as low as 20%. —Star-Telegram Weather Bot, Fort Worth Star-Telegram, 15 Mar. 2026

This warning indicates extreme fire weather conditions are either occurring now or are likely to occur because of a combination of strong winds, low relative humidity, and dry vegetation. —Suryatapa Chakraborty, Dallas Morning News, 15 Mar. 2026

The winds, combined with warmer-than-average temperatures and low relative humidity levels along and to the west of I-35, will lead to high fire danger. —Lauren Bostwick, CBS News, 15 Mar. 2026

Word History

First Known Use

1819, in the meaning defined above

Rhymes for relative humidity

• acidity
• aridity
• avidity
• cupidity
• fluidity
• liquidity
• lucidity
• morbidity
• placidity
• rancidity
• rapidity
• rigidity

Kids Definition

relative humidity

noun

: the amount of water vapor actually present in the air compared to the greatest amount possible at the same temperature

Medical Definition

relative humidity

noun

: the ratio of the amount of water vapor actually present in the air to the greatest amount possible at the same temperature compare absolute humidity