dew point


Definition of dew point

: the temperature at which a vapor (such as water) begins or would begin to condense

Examples of dew point in a Sentence

It's 78° outside and the dew point is 63°.
Recent Examples on the Web Confidence: Medium-High Tonight: Could see some areas of fog develop late this evening and overnight, as temperatures drop close to the dew point with very light winds. Dan Stillman, Washington Post, "D.C.-area forecast: Calm weather for Christmas Day; continues to be seasonably mild through the weekend," 25 Dec. 2019 High pressure along the mid-Atlantic coast will continue to bring hot and humid conditions across Connecticut through Tuesday with high temperatures in the 90s and dew points from the mid-60s to the low 70s., "Weather for Monday, July 29," 29 July 2019 Oh, and mugginess arrives in full (dew points in the 60s) thanks to noticeable southerly breezes near 15 mph. Washington Post, "D.C.-area forecast: Pleasant conditions prevail today, before some rain chances this weekend," 26 Oct. 2019 Temperatures are forecast to rise into the mid-90s today, and dew points are expected to top out in the low to mid-70s. Leigh Morgan, al, "Heat advisories issued for parts of Alabama on Saturday -- and some storms possible too," 7 Sep. 2019 Nevertheless, temperatures and humidity levels will be noticeably more comfortable with highs in the 80s and dew points falling back into the 60s. Greg Porter, Washington Post, "D.C.-area forecast: Hot, humid and unsettled weather continues with a reprieve coming over the weekend," 21 Aug. 2019 The air is very dry, with dew points dropping to about 8 to 12 degrees in the morning. Matt Rogers, Washington Post, "D.C.-area forecast: Rain-snow mix today, with a dramatic temperature drop," 12 Nov. 2019 According to White, a couple of factors are needed to align for frost: The temperature has to be close to the dew point or around 36 degrees, the humidity or water in the air has to be near 100%, and the sky has to be clear with low wind. Amanda Zhou, Indianapolis Star, "Bring your plants in! First frost could come this week," 16 Oct. 2019 Luckily the humidity isn’t terrible, but back in the noticeable range with dew points in the mid-60s, and an isolated shower or thundershower possible toward evening. Brian Jackson, Washington Post, "D.C.-area forecast: Turning sunnier and less humid today; hotter again tomorrow," 15 Sep. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'dew point.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of dew point

1826, in the meaning defined above

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The first known use of dew point was in 1826

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Statistics for dew point

Last Updated

15 Jan 2020

Cite this Entry

“Dew point.” The Dictionary, Merriam-Webster Inc., Accessed 27 January 2020.

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More Definitions for dew point

dew point


English Language Learners Definition of dew point

technical : the temperature at which the moisture in the air forms visible drops of water : the temperature at which dew forms

dew point


Kids Definition of dew point

: the temperature at which the moisture in the air begins to turn to dew

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More from Merriam-Webster on dew point

Rhyming Dictionary: Words that rhyme with dew point

Spanish Central: Translation of dew point

Nglish: Translation of dew point for Spanish Speakers

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