The amount of water vapor in the air, especially when it feels damp or sticky.
From Latin “humiditas,” meaning “moisture” or “dampness,” from “humidus” (wet). It entered English through Middle French scientific vocabulary.
High humidity makes hot days feel hotter because sweat can’t evaporate well, so your body’s cooling system struggles. That’s why the same temperature can feel comfortable in dry air and unbearable in humid air.
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