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 red flag warning is active from 11 a.m. to 8 p.m. on Wednesday, Thursday and Friday for parts of Moffat, Routt, Rio Blanco, Garfield, Mesa, Montrose, Gunnison, Delta, Eagle and San Miguel counties, where relative humidity is as low as 8% and wind gusts could reach 35 mph. —Katie Langford, Denver Post, 6 Aug. 2025

Concerns included the weather during the day and low relative humidity in the single digits. —Rey Covarrubias Jr, AZCentral.com, 3 Aug. 2025

Fire weather alerts are in effect for portions of Utah and Colorado, as relative humidity is expected to fall to less than 10% and wind gusts increase to between 25 and 35 mph. —Kyle Reiman, ABC News, 3 Aug. 2025

The participants were exposed to ambient room temperatures of 100.4 °F (38 °C) with 60% relative humidity, representing high indoor heatwave conditions. —New Atlas, 29 July 2025

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