|Air temperature dependent days|
|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||Snow (cover) 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.
- 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.
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|
|Chunks , resin||Germany||1141||0.0||1901-1950|
|Berlin - Dahlem||Germany||50||6.3||1909-1969|
|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|
|Hörsching ( Linz Airport )||Austria||298||7.7||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|
|Geneva (Genève- Cointrin )||Switzerland||420||9.4||1961-2009|
|Magadino / Cadenazzo||Switzerland||203||3.6||1961-2009|
|Zurich / Fluntern||Switzerland||555||2.6||1961-2009|
- 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)
- 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
- Heisser Tag in the weather dictionary of the German Weather Service (accessed on August 11, 2010).
- 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
- " 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]).
- 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.
- Air Temperature in Central England. ( Memento of the original from September 23, 2015 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. M. Hulme on ecn.ac.uk (accessed August 11, 2015).
- 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).
- 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).
- 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).
- Hot day at the end of October. In: Swiss farmer . October 24, 2018, accessed October 24, 2018 .
- Climate data from Austria 1971–2000 , ZAMG (selected stations)
- Standard climate values at Swiss measuring stations , MeteoSwiss