3. The regional climate and air situation
Solar radiation


Solar radiation measurements for the region of Stuttgart are carried out, among others, at the University of Hohenheim. The following values for global radiation were recorded between 1951 and 1980 (table 3.4):

Month	Global radiation (W/m²)
January	42
February	72
March	122
April	173
May	220
June	237
July	237
August	199
September	152
October	94
November	45
December	31
Year	136

Table 3.4: Global radiation (in W/m²) in Stuttgart-Hohenheim between 1951 and 1980 (source: German Meteorological Service)

Analogous to the position of the sun, the lowest irradiation values occur in December, the highest in June and July. The month of July also has the biggest amount of sunshine hours (about 16 hours), December the fewest (about 8 hours) (table 3.5).

Month	Sunshine hours in Stuttgart-Mitte
January	53
February	77
March	126
April	160
May	204
June	210
July	234
August	212
September	173
October	129
November	60
December	49
Year	1685

Table 3.5: Average sunshine hours in Stuttgart-Mitte between 1951 and 1980 (source: German Meteorological Service)

Global radiation		Highest point of the sun
Average amount of sunshine hours		Amount of possible sunshine hours

© City of Stuttgart, Office for Environmental Protection, Section of Urban Climatology

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