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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
In New York’s late summer humidity, the AMS maintained a stable environment with a relative humidity of around 15%, which kept PLA and PETG perfectly dry. PC Magazine, 24 Oct. 2025 Afternoon relative humidity values are expected to drop into the 25-30% range with intermittent wind gusts up to 15-20 mph. Nc Weather Bot, Charlotte Observer, 22 Oct. 2025 In winter seasons, indoor heating can dry out soil faster and lower relative humidity. Megan Hughes, Better Homes & Gardens, 22 Oct. 2025 The dry and breezy weather system is forecast to persist through the afternoon and is expected to weaken only with the onset of evening, as wind gusts diminish and relative humidity increases. Anna Skinner, MSNBC Newsweek, 6 Oct. 2025 See All Example Sentences for relative humidity

Word History

First Known Use

1819, in the meaning defined above

Time Traveler
The first known use of relative humidity was in 1819

Browse Nearby Words

Cite this Entry

“Relative humidity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/relative%20humidity. Accessed 28 Oct. 2025.

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

More from Merriam-Webster on relative humidity

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!