Tropical night

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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

    Under a tropical night (at meteorologists also under the symbol Tn20GT known) is understood in the German meteorology one night in which the lowest air temperature of 18 6:00  UTC not below 20  ° C falls. The measurements are taken in a standard weather hut at a height of two meters.

    In the relatively cool German-speaking area of ​​Europe there are on average only a few tropical nights per year, for example at the Heidelberg station the long-term average (1981-2010) is 4.5 tropical nights per year, in the inner city of Vienna there are at least 15 tropical nights per year Year registered. Therefore, it is more of an exception. Tropical nights are characteristic of heat waves , in the hot summer of 2003 , for example, 21 tropical nights were recorded for Kehl , 40 tropical nights for the Locarno- Monti station (the warmest place in Switzerland) and 42 tropical nights in the city center of Vienna in summer 2018. As a result of global warming , one assumes an increase in tropical nights in the future or has already noticed it. For example, the climate tables of the Meteorological Institute (MIM) at LMU Munich show an average of 1.7 tropical nights per year for the period from 1982 to 2002. From 2003 to 2018 the number increased to an average of 5.25 tropical nights per year.

    From a medical point of view, tropical nights are problematic for people and are particularly stressful for old or physically weakened people.

    The term tropical night is not used in the tropics and subtropics ; Depending on the geographical location and altitude, the air temperature there does not permanently fall below 20 ° C at night during the summer months. English expressions such as (Very) Hot night are more common , with significantly different limits.

    A date on which the daily maximum temperature is reached 35 ° C or more than desert day or extreme hot day (English Extremely hot day hereinafter).

    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
    5. ↑ "Tropennacht" in the weather dictionary , Deutscher Wetterdienst, accessed September 2, 2017
    6. ↑ a b Tropical night. In: DWD Weather Lexicon. German Weather Service (DWD), accessed on February 27, 2017 .
    7. ↑ Temperature peaks and hot nights. In: Small newspaper. ZAMG (ZAMG), archived from the original on July 20, 2010 .;
    8. ^ A b Nicole North, Natascha Kljun, Florian Kasser, Jürg Heldstab, Markus Maibach, Judith Reutimann, Madeleine Guyer (INFRAS): Climate change in Switzerland . Indicators on causes, effects, measures. In: Federal Office for the Environment (Hrsg.): Environment condition . No. 0728 . Bern 2007, Chapter: 2.3  Heat and frost days, tropical nights and dew days , p. 33 ff . ( Online [PDF; 1,2 MB ; accessed on May 28, 2009] Link to the Austrian Climate Portal (ACCC)).
    9. ↑ Review of the summer of 2018. In: wetter.tv. Ubimet, accessed September 5, 2018 .
    10. ↑ Thomas Deutschländer, Hermann Mächel: Temperature including heat waves. In: Guy Brasseur , Daniela Jacob, Susanne Schuck-Zöller (ed.): Climate change in Germany. Development, consequences, risks and perspectives . Berlin Heidelberg 2017, 47–56, p. 51f.
    11. ↑ Climate values ​​of the city climate station Theresienstrasse 37. In: Climate tables. Meteorological Institute (MIM) of the LMU Munich , accessed on July 7, 2019 (monthly tables must be accessed and read out individually).
    12. ↑ about “ Criteria of hot night: daily minimum temperature higher than or equal to 28.0 degrees C ”. Regional Climate of Hong Kong. Hong Kong Observatory , accessed May 27, 2009 . - for the location of the observatory, for example, 13.1 d / a

    Web links

    Wiktionary: Tropical night  - explanations of meanings, word origins, synonyms, translations