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Winter frost

See under Frost.

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 the temperatures are always slightly higher than on the ground. In meteorology, frost at ground level is called ground frost. Basically a 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 and preferably in deep depressions. The adjective (meaning "added") frost is caused by the influx of already cooled air from other places. This can come from very distant areas such as a long valley.

Frost - Weingarten mit eisüberzogenen Reben

A certain degree of protection can already be achieved when planting the vineyards by taking appropriate measures. A hillside location, from which the cold air flows off into deeper areas (air drainage), as well as high forms of cultivation are of great advantage. Low and flat areas are most at risk. Frost control in the vineyard is achieved by wind machines (or even helicopters), which artificially mix with the warmer air in the upper layers. Warming smoke ovens, large heaters and similar means are also used. Artificial irrigation can be used to directly heat the vines and the soil, because when the water freezes, heat is released and a thin layer of ice on parts of the plant also forms a protective coat.

Frost - Besprühen/Vereisen der Knospen als Schutz gegen Spätfrost

In the northern hemisphere, spring frost is generally referred to as late frost (in the month in question also May frost) and late summer/autumn as early frost. In the course of the annual vegetation cycle, the occurrence of frost is...

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