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Temperature and Moisture Conditions in Medium Low-exchange Nocturnal Radiation Periods 1992

Summary

In summer, cities are at a serious disadvantage compared to more rural areas: the nights are often hotter. During the day, city centres store heat radiation but can only emit a small amount at night (UBA 2019). Since the thermal load influences our health strongly, its development is constantly monitored and assessed in Berlin.

The parameters temperature, water vapour content, relative humidity and excessive humidity are crucial for determining the climate. Data on ‘radiation nights’ has been available since 1985 for the western part of the city. On an ideal radiation night, the ground consistently radiates heat, thus becoming colder itself; as does the air above. This makes for a pleasant climate. The Environmental Atlas data is based on measurements taken between 1981 and 1983. For the eastern part, data was collected between May and September 1991.

According to the ongoing measurements of Berlin’s climate measurement stations, the highest temperatures occur in Kreuzberg, at Alexanderplatz and in Hellersdorf on hot radiation days, i.e. days with lots of sunshine and few clouds. At night, however, the air in Hellersdorf cools down much better than in the city centre. In Grunewald, the night temperature drops more than 8 degrees Celsius lower than in Kreuzberg. On the whole, sparsely built-up and heavily greened residential areas like Zehlendorf exhibit a more favourable 24-hour climate.

You want to learn more about the thermal load in Berlin at night? Discover information, maps and measurement results up until 2000 here. For more information, click here.