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air frost

British  

noun

  1. the deposition of ice condensed from water vapour in the atmosphere on the surface when the air temperature is below 0°C

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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As winds fall lighter overnight it is even possible that Friday morning could start with an air frost - where temperatures drop below freezing.

From BBC Sep. 12, 2024

In England it would represent the earliest air frost in five years, and in Northern Ireland the earliest in six.

From BBC Sep. 12, 2024

If a weather station in Wales drops below 0C it will be the earliest air frost since 1996.

From BBC Sep. 12, 2024

In the making of soils, a process that is constantly going on, the most important agents are water, air, frost, sunshine, and the action of living organisms.

From The Apple by Various

Weathering: the action of moisture, air, frost, etc. upon rocks.

From Agriculture for Beginners Revised Edition by Burkett, Charles William

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