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Ice Day

Meteorological term for a day with permafrost, on which the air temperature never rises above zero °Celsius during the entire 24 hours. An ice day is also always counted as a frost day. The number of frost days for a period, for example for a month, a winter or even an entire year, is a good parameter for the severity of this period. This makes it easy to compare the winters of different years or the climate of different regions in one period. See also under ice wine.

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