Frost day

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Climatological knowledge

Day temperature T: max / med / min
Day temperature  T : max / med / min

Air temperature dependent days
  • T max  ≥ 35 ° C
    		•  Desert day
  • T max  ≥ 30 ° C
    		•  Hot day
  • T min ≥ 20 ° C
    		•  Tropical night
  • T max ≥ 25 ° C
    		•  Summer day
  • T med <15 ° C / 12 ° C
    		•  Heating day
  • T med ≥ 5 ° C
    		•  Vegetation day
  • T min <0 ° C
    		•  Frost day
  • T max <0 ° C
    		•  Ice day
    not uniformly defined: Cold day
    Weather- dependent days
    Cloud cover Bright day
    Cloud cover Cloudy day
    Cloud cover Foggy day
    Humidity / temperature Sultry day
    Precipitation Precipitation day
    Precipitation Rainy day
    Precipitation Hail day
    Precipitation Snow (cover) day
    storm Storm day
    storm Thunderstorm day

    A frost day is the meteorological-climatological term for a day on which the minimum air temperature is below 0 ° C. The measurements are taken in a standard weather hut at a height of two meters. However, if the maximum air temperature, the daily maximum temperature , is below 0 ° C on this day, it is also referred to as an ice day , whereby the frost days that are not ice days are referred to as frost change days . All other days, i.e. days on which the thermometer never sinks below freezing point, are called dew days - the term only makes sense for days in the winter half-year , or for high mountains and other permafrost areas .

    Because the air temperature is measured two meters above the ground, a day with ground frost does not automatically count as a frost day, and conversely, ground frost does not prevail on every frost day when the sun is strong enough to thaw the surface or sublimate the ice cover .

    Mostly the plural of frost days is used. Above all, this indicates the number of frost days for a certain period of time, usually a month, winter or year. The frost change days are the difference between frost and ice days. They are climatic parameters of a place or a special measurement period.

    According to a farmer's rule, the ice saints are the last days in spring when a frost day can be expected.

    List of readings in one place

    Frost days per year on a long-term average
    place Country Height * d / a ∗∗ Averaging period ***
    Bregenz Austria 424 64.6 1971-2002
    Neusiedl Austria 135 77.3 1971-2000
    Graz University Austria 366 97.8 1971-2000
    Innsbruck University Austria 578 96.7 1971-2000
    Klagenfurt Austria 447 129.0 1971-2000
    Linz ( Hörsching Airport ) Austria 298 94.8 1971-2000
    Sankt Pölten Austria 272 85.7 1971-2000
    Salzburg Airport Austria 430 93.6 1971-2000
    Sonnblick 2 Austria 3105 310.2 1971-2000
    Vienna -Inner City Austria 171 50.4 1971-2000
    Zwettl - Pen 1 Austria 505 140.9 1971-2000
    Bolzano -LKH Italy (South Tyrol) 254 97 1981-2000
    Basel / Binningen Switzerland 316 71.0 1961-2009
    Bern / Zollikofen Switzerland 522 103.1 1961-2009
    Davos Switzerland 1594 203.2 1961-2009
    Geneva (Genève- Cointrin ) Switzerland 420 77.8 1961-2009
    Jungfraujoch 2 Switzerland 3580 348.6 1961-2009
    Lugano Switzerland 273 34.9 1961-2009
    Magadino / Cadenazzo Switzerland 203 98.7 1961-2009
    Samedan Switzerland 1708 259.2 1961-2009
    St. Gallen Switzerland 775 103.4 1961-2009
    Zurich / Fluntern Switzerland 555 88.3 1961-2009
    Mainz ( Marienborn ) Germany 153 57.1 1991-2017
    Dreis-Brück Germany 526 87.5 1994-2017
    Schifferstadt Germany 110 56.4 1991-2017
    ∗∗∗ Sorted by the middle of the interval
    1 “Cold pole” of Austria
    2 Permafrost zone, partly currently with decreasing frost penetration

    See also

    Individual evidence

    1. ↑ Note: In contrast to the color markings for the temperature thresholds, the 0 ° C line on the graphic is on the border between turquoise and blue. →  Annual cycle of the graphic (animated)
    2. ↑ a b c d e f g h i j k l m n o Climatological knowledge days in the weather dictionary of the German Weather Service
    3. ↑ Germany : 15 ° C according to VDI 2067 ; Austria , Switzerland , Liechtenstein : 12 ° C according to Usance
    4. ↑ also T med ≥ 10 ° C: day of the main vegetation period

    Web links

    Wiktionary: Frosttag  - explanations of meanings, word origins, synonyms, translations