Heating 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 heating day ( HT ) is a day on which the measured mean outside temperature is below the heating limit . On such a day, the heating system must be switched on in order to keep the indoor temperature at the desired value. The time from the first to the last heating day of the winter season or a sequence of five heating days is called the heating period .

    Various data are used as a basis for the heating limit so that the heating days are indicated:

    • According to the German VDI guideline 2067 / DIN 4108 T6, the heating limit is assumed to be 15 ° C and the internal temperature to be 20 ° C; HT 20/15 is specified .
    • In Austria,
    Switzerland
    and Liechtenstein, a heating limit of 12 ° C and an internal temperature of 20 ° C are used, and HT 20/12 is given .

    Measurements are made according to the meteorological standard in a weather hut at a height of two meters; for building-specific measurements, the outside temperature on the shady side under the roof is also measured.

    The number of degree days / degree days (GTZ / HGT), a parameter of the product of temperature units (Kelvin) and days per year ([Kd / a]), which enables a more precise estimate of the heating requirement , is calculated from the heating days .

    List of readings in one place

    Heating days per year on a long-term average
    place Country Height * Days / a HG Averaging period
    Bregenz Austria 424 210.0 20/12 1971-2000
    Neusiedl Austria 135 193.2 20/12 1971-2000
    Graz University Austria 366 199.6 20/12 1971-2000
    Innsbruck University Austria 578 204.1 20/12 1971-2000
    Klagenfurt Austria 447 209.8 20/12 1971-2000
    Hörsching ( Linz Airport ) Austria 298 212.2 20/12 1971-2000
    Sankt Pölten Austria 272 204.8 20/12 1971-2000
    Salzburg Airport Austria 430 209.1 20/12 1971-2000
    Sonnblick 2 Austria 3105 365.3 20/12 1971-2000
    Vienna -Inner City Austria 171 177.2 20/12 1971-2000
    Zwettl - Pen 1 Austria 505 244.4 20/12 1971-2000
    1 “Cold pole” of Austria
    2 Permafrost zone, partly currently with decreasing frost penetration

    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. ↑ , Heiztage (HT) , energiesparhaus.at
    6. ↑ Heating degree days , Homeowners Association Switzerland