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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Consequently, relative humidity during heat waves has also declined in recent decades, especially in forested regions of California, Oregon and Washington. Mukesh Kumar, The Conversation, 17 June 2026 According to the Florida Climate Center, average relative humidity in Florida runs around 70%-75% in the summer, with major cities like Orlando and Miami peaking near 79% in late summer. Kat Tretina, Charlotte Observer, 15 June 2026 The items inside were at 35% relative humidity. Holly Ramer, Los Angeles Times, 15 June 2026 Dry conditions also persist, with relative humidity between 9% and 15%. Darrell Smith, Sacbee.com, 11 June 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

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Cite this Entry

“Relative humidity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/relative%20humidity. Accessed 24 Jun. 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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