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Humidity
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Map of the United States color-coded to show average relative humidity percentages at local noon in July. The western states, especially Nevada and surrounding areas, have the lowest humidity (under 20%), while humidity increases moving eastward, reaching 70% or higher in the Southeast and Northeast. The Midwest and Great Plains show moderate humidity levels between 40% and 60%. Infographic titled Corn Sweat explains how corn increases humidity through evapotranspiration, showing that U.S. corn releases billions of gallons of water into the air. Includes a map highlighting the Corn Belt states and a corn illustration for scale.
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Humidity: References & Edit History

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  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

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Article History

Type Description Contributor Date
Article title updated for style. Nov 10, 2026
Modified link of Web site: Geosciences LibreTexts - Humidity. Aug 20, 2026
Added corn sweat infographic. Jun 26, 2026
Corrected display issue. Jun 10, 2026
Article revised and updated. Feb 19, 2026
Add new Web site: ABC listen - RN Drive - How's the humidity: what it's doing to your body and will it get worse. Jan 09, 2026
Add new Web site: DigitalCommons at University of Nebraska - Lincoln - Humidity (PDF). Aug 29, 2025
Add new Web site: National Center for Biotechnology Information - PubMed Central - Humidity’s Role in Heat-Related Health Outcomes: A Heated Debate. May 24, 2025
Add new Web site: University of East Anglia - Humidity and Climate Change (PDF). Mar 28, 2025
Add new Web site: IOPscience - Measurement Science and Technology - Humidity sensors. Feb 01, 2025
Add new Web site: Met Office - Humidity. Dec 05, 2024
Add new Web site: Whipple Museum of the History of Science - Measuring Air Humidity. Sep 06, 2024
Add new Web site: Digital Atlas of Idaho - Humidity. Mar 08, 2024
Add new Web site: NOAA National Environmental Satellite, Data, and Information Service - What Is Humidity? Jan 19, 2024
Add new Web site: National Geographic - Humidity. May 12, 2023
Add new Web site: British Council - Literature - Chimamanda Ngozi Adichie. Mar 22, 2023
Add new Web site: Florida's Premier Energy Research Center at the University of Central Florida - Humidity. Feb 09, 2023
Add new Web site: Geosciences LibreTexts - Humidity. Sep 02, 2022
Add new Web site: How Stuff Works - Science - Humidity. Sep 08, 2011
Added new Web site: American Council of Learned Societies - How Humidity is Expressed. Dec 23, 2008
Article revised and updated. Nov 07, 2007
Article added to new online database. Jul 20, 1998
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