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Categorized under "General" Definition as written by Greenwood: A deposit of minute ice crystals formed when water vapor condenses at a temperature below freezing. Definition as written by jody: When the air temperature drops below 0° Celsius or 32° Fahrenheit Definition as written by Terry: Some sources indicate that frost occurs when the soil surface around a plant is at or below 32° Fahrenheit, but the air temperature may still remain warmer than that. Definition as written by poppysue: Frost on a rudbeckia bloom
(Click for full-size) Definition as written by Magpye: The freezing and condensation of moisture in the air. Frost dates are important to know for your zone or area.
According to several university Agricultural Extension Offices, a frost is a localized condition, generally with temperatures going no lower than 29 - 30 F, with calm winds (less than 5 mph), clear skies, and having a mass of cold air that extends only about 30 ft to 200 ft above ground level, often accompanied with a temperature inversion (colder air near the ground with warmer air above the cold air). Temperatures usually rise above freezing the next day.
(Compare and contrast with the definition of freeze in the DG Gardenology)
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