Climatological knowledge days provide a valuable insight into the local climate and its changes. In this visualization, we deal with days on which a defined threshold value of the maximum daily temperature is reached or exceeded. An "Eistag" is a day on which the maximum daily temperature is below 0 °C, while a "Sommertag" is characterized by temperatures of at least 25 °C. "Heiße Tage" or "Hitzetage" are days on which the temperature exceeds 30 °C. "Extrem heiße Tage" or "Wüstentage" are a newer term for days on which the maximum daily temperature reaches or exceeds 35 °C.

In another visualization, we look at the climatic knowledge days, which depend on the minimum daily temperature. A "Frosttag" occurs when the minimum air temperature is below 0 °C. In contrast, a "Tropennacht" is a night in which the minimum air temperature does not fall below 20 °C between 6 p.m. and 6 a.m. UTC. "Tropennächte" occur mainly in urban areas or during intense heat waves. They are medically problematic for humans and are considered to be particularly stressful for the human organism.