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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 risk of wildfire was enhanced by low relative humidity, which had fallen to the 5% to 15% range by early afternoon.
—Karen Kucher, The Mercury News, 11 Dec. 2024
Dry conditions persist, with relative humidity below 10%, prompting the weather service to issue Red Flag warnings until 2 p.m. Wednesday.
—Hanna Park, Robert Shackelford and Mary Gilbert, CNN, 11 Dec. 2024
Gusts of up to 80 mph are possible, and relative humidity is forecast to be alarmingly low, while vegetation is extremely dry.
—Richard Winton, Los Angeles Times, 10 Dec. 2024
Fires in California are more common, but activity at this time of the year is always a cause for concern due to the Santa Ana winds, a seasonal wind pattern that occurs most in the fall, bringing extremely strong and dry downslope winds and lower relative humidity through Southern California.
—Hayleigh Evans, The Arizona Republic, 14 Nov. 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 30 Dec. 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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