Frost day
Climatological knowledge | |
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Air temperature dependent days | |
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Desert day |
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Hot day |
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Tropical night |
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Summer day |
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Heating day |
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Vegetation day |
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Frost day |
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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
place | Country | Height * | d / a ∗∗ | Averaging period *** |
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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 |
- ∗∗d / a… days per year
- ∗∗∗ 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
- Climate data from Austria 1971–2000 , ZAMG (selected stations)
- Standard climate values at Swiss measuring stations , MeteoSwiss
- Agrometeorology DLR RLP
- ↑ 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)
- ↑ 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
- ↑ Germany : 15 ° C according to VDI 2067 ; Austria , Switzerland , Liechtenstein : 12 ° C according to Usance
- ↑ also T med ≥ 10 ° C: day of the main vegetation period