Cold 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

    Cold day is the name for days on which the daytime temperature is consistently low. There are various completely different definitions, so that the term is not very useful for comparison purposes:

    • Days with maximum daily temperature below plus 10 ° C, sometimes also below +12 ° C for the tropics - in German-speaking meteorology, the specification of cold days in this sense is not usual today, heating days are given below +12 ° C or +15 ° C
    • Cold day defined as a day with a maximum temperature of minus 10 ° Celsius, i.e. a day with severe frost . The second definition is also of importance in weather climatology, especially when defining classification systems for weather types, the −10 ° C limit is more interesting than the + 10 ° C limit. In the United States, because of the use of the Fahrenheit temperature scale, other temperature thresholds are generally used for definition.
    • In addition, the designation can also be found for what is defined as a frost day ( lowest daily temperature <0 ° C), or an ice day ( highest daily temperature <0 ° C), or for the mean daily temperature ≤ 0 ° C

    Most of the time cold days are spoken of in the plural . Above all, this indicates the number of cold days for a certain period of time, i.e. mostly for a month, a winter or a year.

    A completely different use is to generally compare 'cold (colder, too cold)' and 'warm' days, the [too] cold day is then a day on which the daily mean temperature is the respective (long-term) mean temperature was measured for this calendar day, falls below ( cold anomaly ) , the other days are [too] warm days (warmth / heat anomaly ) . This makes a statement about the temperature relative to the (local, long-term) mean temperature, not about absolute values.

    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
    5. ↑ about “ cold day (24-hour mean of 10 [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]).
    6. ^ " Criteria of cold day: daily minimum temperature lower than or equal to 12.0 degrees C ". Regional Climate of Hong Kong. Hong Kong Observatory , accessed May 27, 2009 .
    7. ↑ The weather lexicon of the DWD ( Memento of the original from December 16, 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. about does not lead the term @1@ 2Template: Webachiv / IABot / www.deutscher-wetterdienst.de
    8. ↑ Brockhaus
    9. ↑ “ 15 ° F or less as a cold day [in New York] ” (that's −7.55 ° 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).
    10. ↑ “ Annual number of 'cold' days (mean temperature <0 ° C) ”. M. Hulme: Air Temperature in Central England. In: Indicators of Climate Change in the UK. Climate, Hydrology, Sea Level and Air Pollution. Hong Kong Observatory , accessed May 27, 2009 .
    11. ↑ about “ Cold days and warm days are defined as days with mean temperature crossing the seasonally varying [10th an 90th percentiles in the 1961–1990 baseline period]. "Janet Wijngaard, Albert Klein Tank: European Climate Assessment . In: Koninklijk Nederlands Meteorologische Instituut (Ed.): KNMI Research Biennial Reports. Highlights . S. 45–46 , 2 (English, knmi.nl [PDF] 2005–2006). European Climate Assessment ( Memento of the original dated December 2, 2013 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.knmi.nl