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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
The relative humidity in Oakland was 90% at 5 a.m. Thursday, according to the weather service.
—Jason Green, The Mercury News, 17 Oct. 2024
The heat index value, which represents how hot the air feels by taking into account relative humidity, could go as high as 112, according to the National Weather Service.
—The Arizona Republic, 26 July 2024
The heat index combines air temperature with relative humidity to provide a measure of what the temperature actually feels like to people.
—Doyle Rice, USA TODAY, 9 July 2024
Forecasters aren’t too concerned about fire danger, despite the warm temperatures, gusts and low relative humidity, because the rain from the weekend storm should keep risk relatively low.
—Summer Lin, Los Angeles Times, 6 May 2024
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Word History
First Known Use
1819, in the meaning defined above
Time Traveler
The first known use of relative humidity was
in 1819
Dictionary Entries Near relative humidity
Cite this Entry
“Relative humidity.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/relative%20humidity. Accessed 22 Nov. 2024.
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
Britannica.com: Encyclopedia article about relative humidity
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