Bright 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

    Climatology counts days when there is mostly sunshine as a clear day . There is no precipitation on these days.

    definition

    • Formerly, when cloud cover was given in tenths, clear day was understood as a day with a cloud mean of less than 1.6 eighths, which corresponds to approximately 20% sky cover.
    • Today is understood as a day when the mean value of the degree of coverage is not above a certain threshold value.

    Since the degree of coverage is estimated in tenths of the sky when observing the climate and in eighths of the area of ​​the sky when observing the weather, there are different threshold values ​​when determining clear days.

    In climatology a limit value of 2/10 is used, in meteorology it is 2/8 (cloudy day).

    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. ↑ bright day - Lexicon of Geosciences . ( Spektrum.de [accessed on June 3, 2017]).
    6. ↑ a b cheerful day - Lexicon of Geography . ( Spektrum.de [accessed on June 3, 2017]).