frost

A frost occurs when the temperature of the air falls below freezing (0oC), associated with the condensation and freezing of water vapour from the air onto cold surfaces such as the ground and car windows.

air frost,
black frost,
dew,
frost crack,
frost damage,
frost hardiness,
frost heave,
frost pocket,
glazed frost,
ground frost

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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