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Climatic condition at a temperature below 0 °Celsius or 32 °Fahrenheit. In general, the air temperature is measured at a height of 1.25 metres above the ground; at this height, temperatures are always slightly higher than at ground level. In meteorology, frost at ground level is referred to as ground frost. A basic distinction is made between radiation frost and adjective frost. Radiation frost occurs on dry, clear nights with no wind, when the heat radiated from the ground or plant tissue escapes unhindered into the atmosphere due to the absence of clouds, fog or haze. The coldest (and heaviest) air sinks to the ground and collects on the surface, preferably in low-lying depressions. The adjective (meaning "added") frost is caused by the inflow of already cooled air from other places. This can come from very distant areas such as a long valley.

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Markus J. Eser

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Markus J. Eser
Weinakademiker und Herausgeber „Der Weinkalender“

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