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 summer, a basement's relative humidity should be kept below 60 percent to prevent the growth of mold. Brandee Gruener, Southern Living, 26 May 2025 Wind gusts up to 20 mph, coupled with relative humidity levels between 25 and 35 percent, have created the perfect storm for rapid wildfire spread, NWS meteorologists warned. Thomas G. Moukawsher, MSNBC Newsweek, 25 Apr. 2025 In New Mexico, portions of the state, including Albuquerque, are under an extreme threat -- the highest warning by the National Weather Service -- due to wind gusts that could reach 60 mph on Thursday, along with a relative humidity between 5% and 10%. Shawnie Caslin Martucci, ABC News, 16 Apr. 2025 Winds are forecasted to be southwest 25 to 35 mph with gusts up to 55 mph and relative humidity as low as 8 percent. Star-Telegram Weather Bot, Fort Worth Star-Telegram, 14 Mar. 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 7 Jun. 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!