Hot 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

    Hot day or hot day , older also tropical day , is the meteorological-climatological term for days on which the daily maximum temperature reaches or exceeds 30 ° C. It is used for a more precise representation of the climate of a location and for assessing heat waves . The measurements are taken in a standard weather hut at a height of two meters. The set of hot days is a subset of the summer days . If the daily minimum temperature does not fall below 20 ° C, one also speaks of a tropical night .

    To the subject

    Hot day is used today in meteorology in Germany and Austria, in Switzerland, for example, hot day is more common, the older term tropical day is also still used because of its uniqueness. It relates to the influx of [sub-] tropical warm air into Central Europe, which typically leads to abnormally hot summer days.

    Other definitions:

    • Deviating from this definition for the hot day that is customary in German-speaking countries , definitions such as maximum daily temperature ≥ 33 ° C for East Asia, or mean daily temperature ≥ 30 ° C can also be found for English (very) hot days in other parts of the world and climatic zones .
    • In England, for example, with its more moderate climate, there is also hot day as a daily mean temperature of ≥ 20 ° C
    • In the United States, because of the use of the Fahrenheit temperature scale, different temperature thresholds have generally been used to define specific days.
    • In Norway , the terms hot day and tropical day continue to have separate meanings:
      • Tropedag ( Norwegian dag is the clear day ): corresponds to the hot day .
      • Tropedøgn ( døgn is a 24-hour day ): corresponds to a combination of "our" hot day and the tropical night . This means that the maximum temperature must rise above 30 ° C within 24 hours and the minimum daily temperature must not fall below 20 ° C.

    Since 30 ° C is hot in Central Europe, but by no means uncommon, an abnormally hot day is increasingly becoming a desert day and other additional names.

    In Switzerland the earliest hot day was on April 8th ( Lugano in 2011, 30.8 ° C), the latest hot day on October 24th ( Locarno-Monti in 2018, 30.5 ° C).

    List of measured values: Hot days per year on a long-term average

    place Country Height ∗ there Averaging period ∗∗
    London - Kew United Kingdom 25th 1.2 1881-1980
    De Bilt Netherlands 4th 3.0 ?
    Heligoland Germany 8th 0.0 1952-2012
    Norderney Germany 5 0.6 1961-1990
    Chunks , resin Germany 1141 0.0 1901-1950
    Munich Germany 518 5.8 1901-1950
    Nuremberg Germany 309 7.2 1901-1950
    Zugspitze Germany 2962 0.0 1901-1950
    Greifswald Germany 5 1.7 1901-1950
    Frankfurt (Oder) Germany 40 7.1 1901-1950
    Osnabrück Germany 63 3.0 1961-1990
    Stuttgart Germany 245 8.4 1961-1990
    Berlin - Dahlem Germany 50 6.3 1909-1969
    Erfurt Germany 195 5.6 1961-1990
    Dessau Germany 59 6.8 1901-1950
    Bonn - Friesdorf Germany 60 4.6 1951-1970
    Frankfurt am Main Germany 112 9.0 1870-1956
    Upper Munster Valley Germany 424 3.6 1958-1977
    Mainz ( Marienborn ) Germany 153 13.1 1991-2017
    Dreis-Brück Germany 526 3.0 1994-2017
    Schifferstadt Germany 110 17.5 1991-2017
    Bregenz Austria 400 3.2 1971-2000
    Neusiedl Austria 135 15.1 1971-2000
    Graz University Austria 366 6.5 1971-2000
    Innsbruck University Austria 578 10.5 1971-2000
    Klagenfurt Austria 447 8.7 1971-2000
    Hörsching ( Linz Airport ) Austria 298 7.7 1971-2000
    Sankt Pölten Austria 272 11.6 1971-2000
    Salzburg Airport Austria 430 8.0 1971-2000
    Sonnblick 2 Austria 3105 0.0 1971-2000
    Vienna -Inner City Austria 171 17.9 1971-2000
    Zwettl - Pen 1 Austria 505 3.3 1971-2000
    Basel / Binningen Switzerland 316 6.8 1961-2009
    Bern / Zollikofen Switzerland 522 3.3 1961-2009
    Davos Switzerland 1594 0.0 1961-2009
    Geneva (Genève- Cointrin ) Switzerland 420 9.4 1961-2009
    Jungfraujoch 2 Switzerland 3580 0.0 1961-2009
    Lugano Switzerland 273 2.2 1961-2009
    Magadino / Cadenazzo Switzerland 203 3.6 1961-2009
    Samedan Switzerland 1708 0.0 1961-2009
    St. Gallen Switzerland 775 0.3 1961-2009
    Zurich / Fluntern Switzerland 555 2.6 1961-2009
    Istanbul Turkey 40 22.6 1937-1970
    Trabzon Turkey 0 2.3 1929-1970
    Ankara Turkey 938 45.9 1926-1970
    Kars Turkey 1775 6.6 1929-1970
    Antalya Turkey 30th 85.3 1930-1970
    Tunis Tunisia 4th 75.5 ?
    Kairouan Tunisia 65 121.1 ?
    Kabul Afghanistan 1791 82.2 1959-1970
    Kunduz Afghanistan 397 134.6 1959-1970
    Remarks:
    ∗∗ Sorted by the middle of the interval
    1 “Cold pole” of Austria
    2 Permafrost zone, partly currently with decreasing frost penetration

    See also

    proof

    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. ↑ Heisser Tag in the weather dictionary of the German Weather Service (accessed on August 11, 2010).
    6. ↑ cf. the message Stephan Bader (Federal Office for Meteorology and Climatology MeteoSwiss), quoted in the article Ferrari, 26 Sep 2008 12:16 # 153661, thread Basic question: Classification of days ( Memento of the original from March 5, 2016 in the Internet Archive ) Info: The archive link was used automatically and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. in swisswetter.ch  @1@ 2Template: Webachiv / IABot / www.swisswetter.ch
    7. ^ " Criteria of very hot day: daily maximum temperature higher than or equal to 33.0 degrees C ". Regional Climate of Hong Kong. Hong Kong Observatory , accessed May 27, 2009 . , or " For the purpose of this summary report, the" hot day "is defined as the day that maximum temperature is higher than 33 ° C. ”, Suppakorn Chinvanno, Thanat Choengbunluesak: Final Report on Climate Change Scenarios for Songkram River Basin . In: Southeast Asia START Regional Center, IRG / USAID (Ed.): Environmental Health Perspectives . S. 12 ( pdf , sea-climatechange.org [accessed May 27, 2009]).
    8. ↑ about “ hot day (defined as a 24-hour mean of 30 [degrees] C). "Bob Weinhold: Weather warning: climate change can be hazardous to your health . In: Environmental Health Perspectives . Vol. 110, No. September 9 , 2002 ( findarticles.com [accessed May 27, 2009]). or W. Conard Holton: Reprieve for Perchlorate . In: ibid . ( EHP online [accessed May 27, 2009]). EHP online ( Memento of the original from May 15, 2009 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.  @1@ 2Template: Webachiv / IABot / www.ehponline.org
    9. ^ Air Temperature in Central England. ( Memento of the original from September 23, 2015 in the Internet Archive ) Info: The @1@ 2Template: Webachiv / IABot / www.ecn.ac.uk archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. M. Hulme on ecn.ac.uk (accessed August 11, 2015).
    10. ↑ z. B. “ 91 ° F or higher than the definition of a hot day in New York ” (32.8 ° C). James Hansen, Makiko Sato, Jay Glascoe, Reto Ruedy: A Common Sense Climate Index: Is Climate Changing Noticeably? Ed .: Goddard Institute for Space Studies (GISS), NASA. March 1998 (English, web document , Science Briefs, giss.nasa.gov).
    11. ↑ Tropedager - Meteorologileksikon ( Memento of the original from January 23, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , Norske Meteorologisk Institutt (accessed on July 13, 2010). @1@ 2Template: Webachiv / IABot / metlex.met.no
    12. ↑ Tropedøgn - Meteorologileksikon ( Memento of the original from March 8, 2012 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. , Norske Meteorologisk Institutt, (accessed July 13, 2010). @1@ 2Template: Webachiv / IABot / metlex.met.no
    13. ↑ https://www.srf.ch/meteo/meteo-news/seltene-hitze-im-mai
    14. ↑ Hot day at the end of October. In: Swiss farmer . October 24, 2018, accessed October 24, 2018 .

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