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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
Scott Safechuck, a Santa Barbara Fire Department spokesman, said temperatures had reached 90 degrees and relative humidity was nine percent in the fire area as of last night.
—
Bruce Haring, Deadline, 7 July 2024
The temperature in Baltimore Friday afternoon reached 97 degrees, with a heat index of 105, which measures air temperature and relative humidity to determine what the temperature feels like to the body, according to the National Weather Service.
—
Dana Munro, Baltimore Sun, 5 July 2024
Pay attention to the heat index The heat index is a number that combines air temperature with relative humidity to reflect what a hot day actually feels like to your body.
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Michelle Deal-Zimmerman, Baltimore Sun, 21 June 2024
In New York, the maximum heat index — which combines temperature with relative humidity — was predicted to hover around 100 in some places on Wednesday.
—
Joe Hernandez, NPR, 19 June 2024
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These examples are programmatically compiled from various online sources to illustrate current usage of the word 'relative humidity.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
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 15 Jul. 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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