Definition of hard frostCategorized under "General"
Definition as written by Terry:
When temperatures fall below 28° Fahrenheit for a few hours. Tender plants may very well be killed by a hard frost, although more cold-hardy plants may only sustain foliage damage at these temperatures - for more information see also light frost and freeze
Also called a radiational freeze or frost, it occurs when the winds are calm and the sky is clear, allowing an inversion to form because of rapid radiational cooling at the earth's surface.
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