Summer 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

    A summer day is the meteorological-climatological term for a day on which the maximum daily temperature reaches or exceeds 25.0 ° C. Days on which the temperature reaches 30.0 ° C or more are recorded as hot days (hot day, tropical day). The set of hot days is a subset of the summer days. The measurements are taken in a standard weather hut at a height of two meters. If the night-time minimum temperature does not drop below 20.0 ° C, it is also called a tropical night . It should be noted that (according to the German Weather Service) the official measurement period is defined for the nightly minimum from 18:00 UTC of the previous day to 06:00 UTC of the current day - in summer from 20:00 CEST to 08:00 O'clock CEST.

    In Switzerland the earliest summer day was on March 9th ( Lugano in 2000), the latest summer day - also the latest hot day - on October 24th ( Locarno-Monti in 2018, 30.5 ° C).

    List of readings in one place

    Summer days per year on a long-term average
    place Country Altitude * Days / a Averaging period
    Bregenz Austria 424 35.3 1971-2000
    Neusiedl Austria 135 66.6 1971-2000
    Graz University Austria 366 52.1 1971-2000
    Innsbruck University Austria 578 55.5 1971-2000
    Klagenfurt Austria 447 54.4 1971-2000
    Hörsching ( Linz Airport ) Austria 298 49.0 1971-2000
    Sankt Pölten Austria 272 55.7 1971-2000
    Salzburg Airport Austria 430 50.8 1971-2000
    Sonnblick 2 Austria 3105 0.0 1971-2000
    Vienna -Inner City Austria 171 67.6 1971-2000
    Zwettl - Pen 1 Austria 505 28.4 1971-2000
    Basel / Binningen Switzerland 316 41.6 1961-2009
    Bern / Zollikofen Switzerland 522 32.6 1961-2009
    Davos Switzerland 1594 1.4 1961-2009
    Geneva (Genève- Cointrin ) Switzerland 420 47.2 1961-2009
    Jungfraujoch 2 Switzerland 3580 0.0 1961-2009
    Lugano Switzerland 273 49.7 1961-2009
    Magadino / Cadenazzo Switzerland 203 65.1 1961-2009
    Samedan Switzerland 1708 1.3 1961-2009
    St. Gallen Switzerland 775 12.4 1961-2009
    Zurich / Fluntern Switzerland 555 30.2 1961-2009
    Mainz ( Marienborn ) Germany 153 51.9 1991-2017
    Dreis-Brück Germany 526 19.3 1994-2017
    Schifferstadt Germany 110 61.1 1991-2017
    1 “Cold pole” of Austria

    A comparison of the number of summer days at the measuring stations of the German Weather Service in different averaging periods shows the increase in the last few decades caused by global warming .

    Summer days per year on average over 30 years
    place Altitude * Days / a
    1961–1990    		 Days / a
    1971-2000    		 Days / a
    1981-2010
    Arkona (WEWA) 42 2.0 3.2 3.9
    Cuxhaven (WEWA) 5 8.9 11.2 13.4
    Hamburg-Wandsbek 18th 19.0 24.6 30.5
    Villingen-Schwenningen 720 23.5 24.9 30.6
    Kassel (AWST) 231 29.8 30.2 31.7
    Kempten (Allgäu) (WST) 705 23.1 26.4 32.4
    Gera-Leumnitz (WEWA) 311 28.5 31.3 35.7
    Cologne-Wahn (FLUGWEWA) 92 34.0 37.5 42.3
    Berlin-Tempelhof (WST) 48 34.3 37.4 42.8
    Stuttgart Schnarrenberg (AWST) 314 35.3 39.7 47.2
    Cottbus (WEWA) 69 44.8 47.2 51.1
    Regensburg (WEWA) 365 38.8 44.9 52.5
    Wiesbaden (SUED) 147 42.9 47.5 53.3
    Freiburg i. Br. (AWST) 236 49.0 54.2 60.4
    Karlsruhe (WEWA) 112 52.9 58.9 68.0

    There are most summer days at the measuring stations of the German Weather Service in the months of July and August:

    Summer days per month, 30-year mean 1981 to 2010
    place Nov-Feb March April May June July Aug Sept Oct total
    Arkona (WEWA) 0.0 0.0 0.0 0.1 0.3 1.6 1.8 0.1 0.0 3.9
    Cuxhaven (WEWA) 0.0 0.0 0.1 0.6 2.2 5.3 4.5 0.8 0.0 13.4
    Hamburg-Wandsbek 0.0 0.0 0.5 3.0 5.4 10.9 9.2 1.6 0.0 30.5
    Villingen-Schwenningen 0.0 0.0 0.0 1.6 5.8 11.0 9.7 2.5 0.1 30.6
    Kassel (AWST) 0.0 0.0 0.6 2.7 5.5 11.2 9.7 2.0 0.0 31.7
    Kempten (Allgäu) (WST) 0.0 0.0 0.0 2.4 7.0 11.1 9.7 2.1 0.3 32.4
    Gera-Leumnitz (WEWA) 0.0 0.0 0.3 2.5 6.3 12.0 11.5 3.0 0.1 35.7
    Cologne-Wahn (FLUGWEWA) 0.0 0.0 1.1 4.6 8.3 13.3 11.5 3.2 0.1 42.3
    Berlin-Tempelhof (WST) 0.0 0.0 0.8 4.2 7.9 13.9 12.9 3.1 0.1 42.8
    Stuttgart Schnarrenberg (AWST) 0.0 0.0 0.7 3.8 8.7 15.1 14.1 4.4 0.4 47.2
    Cottbus (WEWA) 0.0 0.0 1.2 5.6 9.3 15.8 14.8 4.0 0.3 51.1
    Regensburg (WEWA) 0.0 0.0 0.8 5.1 10.8 16.6 15.4 3.7 0.1 52.5
    Wiesbaden (SUED) 0.0 0.0 1.1 5.5 10.7 15.7 15.8 4.4 0.1 53.3
    Freiburg i. Br. (AWST) 0.0 0.1 1.1 6.0 11.3 18.2 17.4 5.7 0.7 60.4
    Karlsruhe (WEWA) 0.0 0.1 1.6 7.4 12.4 19.0 19.2 7.6 0.6 68.0

    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. ↑ https://www.srf.ch/meteo/meteo-news/der-erste-sommertag-so-ganz-normal
    6. ↑ Hot day at the end of October. In: Swiss farmer . October 24, 2018, accessed October 24, 2018 . , referring to the official monitoring network. Private weather services massed summer days on October 28, 2013, cf. 20 minute report .
    7. ↑ The number of summer days will double (Die Welt online, April 16, 2008)
    8. ↑ Data from the German weather service for 1961–1990 , 1971–2000 and 1981–2010 (overview of other tables here ).

    Web links

    Wiktionary: summer day  - explanations of meanings, word origins, synonyms, translations