Average monthly and annual values in Stuttgart


September



The month of September marks the beginning of the autumn months with significantly fewer daylight hours. It is also the month of rising air pollutant concentrations, except for the ozone levels. The critical ozone level is very rarely reached in September. But September marks the beginning of the heating period and this leads to another source of pollution (besides traffic, which plays the major role), i.e. heating systems.

Temperature inversions are more frequent in this month - a situation that favours the accumulation of pollutants in the morning hours.

Areas of high pressure often remain above Central Europe for a longer period of time. It is the time of the Indian summer, which usually reaches its climax of warm weather during the last September days. The phenomena of the warm Indian summer in September and the "sheep's cold snap" in June are two constantly recurring weather particularities. This is why September regularly has a number of summer days: an average of 4.3 days in the inner city and 2.9 days on the Filder plains

Maximum temperatures can even exceed 86 °F (30 °C) in some years. On the other hand, 25 September marks the ending of what is called the frost-free period in Hohenheim as the first frost was recorded on that day. The frost-free period in Hohenheim lasts 127 days, from 21 May to 24 September.

Weather lore:

- If dry be the buck's horn, on Holyrood (26 September) morn.

- Fair on September first, fair for the month.

---

 

Average monthly values of the climatic elements measured in Stuttgart-Zentrum (312 m), Stuttgart-Schnarrenberg (314) and Stuttgart-Hohenheim (420 m)

 

Climatic element	STUTTGART		Stuttgart-Hohenheim
	Stadtmitte 1951-1980	Schnarrenberg 1961-1990**	1951-1980	1961-1990
Average temperature (in °F/°C)	64.6/ 18.1	64.2/ 17.9	62.1/ 16.7	62.9/ 17.2
Maximum temperature (in °F/°C)	96.6/ 35.9 (1966)	95.2/ 35.1	93.7/ 34.3 (1985)	-
Minimum temperature (in °F/°C)	42.8/ 6.0 (1979)	41.4/ 5.2	37.9/ 3.3 (1980)	-
Ice days (in days)	0	0	0	0
Frost days (in days)	0	0	0	0
Heating days (in days)	5.3	-	9.5	-
Degree-day figure *	24	-	-	-
Summer days (in days)	10.1	10	7.9	-
Hot days (in days)	2.1	-	1.2	1.4
Sultry days (in days)	5.4	-	-	-
Rain days (in days)	12.8	12	14.7	14.0
Thunderstorm days (in days)	-	-	4.1	5.7
Amount of precipitation (in mm)	83	76	84	77
Evaporation (in mm)	-	58	-	-
Highes point of the sun (degrees)	55	55	55	55
Possible sunshine hours (in hours)	437	437	437	437
Average amount of sunshine hours (in hours)	211	-	211	212
Global radiation (in W/m²)	-	-	199	-

 

(Figures in red respresent the years between 1961-1990, figures in black the years between 1951-1980)
*( degree-day figure = average from the years 1982 - 1997)
**( after the relocation of the Weather Central, the given values are those for Stuttgart - Schnarrenberg)

 

---

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

• Kontakt
• Sitemap
• Suche
• Hilfe
• Intranet Login
• Intranet
• Impressum