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

An average relative humidity in the month of January on a dry day would be somewhere 30 to 40 %. —Dave Aguilera, CBS News, 15 Jan. 2026

Up to 50 mph wind gusts are expected in those counties, and relative humidity values may drop as low as 13%, weather service forecasters said. —Lauren Penington, Denver Post, 15 Jan. 2026

According to Hancock, most common houseplants come from tropical rainforests where relative humidity stays above 60%. —Gemma Johnstone, The Spruce, 12 Jan. 2026

As a result, relative humidity will be low, leading to a moderate to high wildfire danger across the region, according to the Texas A&M Forest Service. —Mary Wasson, Austin American Statesman, 10 Jan. 2026

Word History

First Known Use

1819, in the meaning defined above

Rhymes for relative humidity

• acidity
• aridity
• avidity
• cupidity
• fluidity
• liquidity
• lucidity
• morbidity
• placidity
• rancidity
• rapidity
• rigidity

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