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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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Parts of Scotland and Northern Ireland dropped to minus 4 Celsius on Sunday morning with minus 2 Celsius recorded in northern England while Wales registered its first air frost of the season.

From BBC ● Oct. 19, 2026

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

From BBC ● Sep. 12, 2024

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

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.

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