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
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Winds could gust up to 60 mph, while relative humidity drops to 8–15%, creating high to critical fire danger through the day. Alex Lehnert, CBS News, 22 Dec. 2025 The relative humidity is expected to drop below 30%, the weather service said. Robert A. Cronkleton, Kansas City Star, 19 Dec. 2025 Across Colorado, the strong winds and low relative humidity will lead to a high fire danger, including along the Interstate 25 corridor. Kathryn Prociv, NBC news, 17 Dec. 2025 Wood furniture is best preserved in homes with 30 to 50 percent relative humidity. Brandee Gruener, Southern Living, 16 Dec. 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 25 Dec. 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
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