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 are forecasted to be northeast 10 to 25 mph with gusts up to 40 mph and relative humidity as low as 15%. Nc Weather Bot, Charlotte Observer, 28 Mar. 2026 Those include temperatures above 77 degrees, dew points above 55 degrees, relative humidity above 50% and any threat of rain or strong winds. Newsroom Meteorologist, Houston Chronicle, 26 Mar. 2026 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 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 2 Apr. 2026.

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

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