In addition to the old city municipality (free imperial city and republic of St. Gallen until 1798) and the former monastery district of the prince abbot, St. Gallen consists of the original villages and hamlets of Bruggen, Hafnersberg, Heiligkreuz, Kräzern, Krontal, Lachen, Neudorf, Notkersegg, Riethüsli, Rotmonten, St. Fiden, St. Georgen, Sittertal, Tablat and Winkeln. These hamlets and villages formerly belonged to the then independent municipalities of Straubenzell and Tablat and were incorporated into the town in 1918 (→ Stadtverschmelzung).
The main part of the town settlement lies in a wide valley between two parallel hills, the Rosenberg with Rotmonten in the north and the Freudenberg in the south. The valley lies on a southwest-northeast axis, yet colloquially spoken of a west-east axis. The valley is bounded in the southwest by the deeply cut Sitterschlucht gorge, and in the northeast the Steinach flows out of the town towards Lake Constance. The historic town centre lies on the upper reaches of the Steinach, where Gallus built his hermitage. Except in the St. Georgen quarter, in the Mühlenenschlucht gorge and in the very north-east of the town, however, there is nothing left of the watercourse because it is channelled to the edge of the town in an underground canal. From the Freudenberg, which offers a local recreation area with the Drei Weieren, a large part of Lake Constance, Thurgau and southern Germany can be seen on a clear day.
Outside the settlement areas, the urban area encompasses a large part of the surrounding hilly landscape. To the west of the Sittertobel, Winkeln lies on the watershed between the catchment area of the Sitter and that of the Glatt. In the centre of Winkeln lies the Bildweier and below Sturzenegg the Gübsensee, which was created as a reservoir for the Kubel power station. North of Winkeln, the town boundary follows the Wisenbach to the Sitter. To the northwest, the border runs under the steep mountain slope with the Sitterwald and Hätterenwald forests for four kilometres in the riverbed of the Sitter to the hamlet of Joosrüti. To the north, the town boundary crosses the range of hills from the Chatzenstrebel to the Peter and Paul Wildlife Park and down into the Galgentobel on the Steinach and from there over the Höchst hill to the Goldachtobel below the hamlet of Paradies. The steep western slope of the Goldach and Martinstobel below the castle site of Rappenstein lies in town territory. At Neudorf, the Martinsbrugg leads across the narrow gorge. In the east, the Bernhardsbach borders the town area from the Vögelinsegg down to the Goldach. In the south, the northern mountain slope below the mountain range, which extends from the Vögelinsegg over the Horst to the Kunzenegg, belongs to St. Gallen with the source streams of the Steinach. In the Weier valley east of St. Georgen lies the man-made Wenigerweiher. From Kunzenegg, the city and cantonal border follows the five-kilometre course of the Wattbach stream to its confluence with the Sitter at Zweibruggen and near the Haggenbrücke bridge.
Because of the special topography of the city, St. Gallen is also called the city of the "thousand staircases", as many staircases lead up the Freudenberg and Rosenberg. The city is also called "The City in the Green Ring", because on the hills in front of the city even today extensive forest areas serve as recreational areas. The highest point of the town is at 1074 m above sea level on the south-eastern border of the town (west of Speicher), the lowest point at 496 m above sea level in the Goldachtobel.
Almost one third of the area of the city of St.Gallen is used for agriculture.
Geology
St. Gallen is located in the area of the shallow midland molasse. Large parts of the city are located on unstable peat soil with a large proportion of groundwater. Many buildings in the city centre (including the railway station and the main post office) were therefore built on piles of oak wood.
The hill ranges southwest of the town belong to the foothills of the Alpstein. The so-called uplifted molasse is characterized by distinct ridges. The hills to the northeast, however, belong to the Lake Constance basin. They form plateaus as flat-lying molasse. Where hard rock is exposed (for example in the Sittertobel), this consists mainly of Nagelfluh, sandstone or marl.
Climate
St. Gallen lies in the temperate climate zone with predominantly changeable westerly wind weather. Since the hills of the city are the first elevations for cloud formations from the west to the northeast, there are often days of accumulated rain or snowfall. The clouds accumulate especially in the Alpstein mountains and precipitation occurs. When the wind is north or northeast, the Gallus city experiences bisenlage, which means it gets very cold. This is usually associated with high fog, as the cold, moist air masses settle on the ground, while higher regions experience fine weather (→ temperature inversion). The large water mass of Lake Constance further supports the formation of fog, especially in autumn and winter (→ Lake Constance climate).
In summer, frequent and prolonged precipitation characterizes the weather, especially strong evening thunderstorms. In case of high fog, which often occurs especially in autumn, the city can be more or less affected. Due to its high altitude, there are days when it is just above the fog layer (at least the higher altitudes), on other days it dissipates during the day, sometimes it remains grey for days. With a southerly foehn, on the other hand, it is sunny and warm. With foehn support, the temperature can rise 10 °C and more in a few hours, although the city is not in the main area of influence of the south wind. In winter, precipitation falls as snow, which can remain in shady locations until April.
The annual mean temperature is 8.3 °C, with the coldest monthly mean temperatures measured in January at -0.3 °C and the warmest in July at 17.2 °C. On average, around 93 frost days and 35 ice days are to be expected here. There are about 19 summer days on an annual average, while there are normally 0.8 heat days. The average amount of precipitation is 1442 mm, most of which falls in summer. The MeteoSwiss weather station is located at an altitude of 776 m above sea level near Notkersegg. Especially during inversions or high fog, it is cooler and/or more humid in the city basin, which is about 100 m lower.
| St. Gallen, 1981-2010 |
| Climate diagram |
| J | F | M | A | M | J | J | A | S | O | N | D | | | | | | | | | | | | | | | Temperature in °C, precipitation in mm | | Source: | |
Monthly average temperatures and precipitation for St. Gallen, 1981-2010 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | | | | Max. Temperature (°C) | 2,5 | 3,3 | 7,3 | 11,5 | 16,3 | 19,2 | 21,6 | 20,9 | 16,8 | 12,3 | 6,5 | 3,5 | Ø | 11,9 | | Min. temperature (°C) | −3,0 | −2,5 | 0,6 | 3,5 | 7,8 | 11,0 | 13,1 | 13,0 | 9,7 | 6,2 | 1,0 | −1,9 | Ø | 4,9 | | Temperature (°C) | −0,3 | 0,4 | 3,9 | 7,4 | 12,0 | 15,0 | 17,2 | 16,8 | 13,1 | 9,1 | 3,7 | 0,8 | Ø | 8,3 | | | Precipitation (mm) | 64 | 63 | 92 | 110 | 156 | 166 | 187 | 179 | 147 | 96 | 96 | 87 | | 1443 | | | Sunshine hours (h/d) | 1,9 | 2,8 | 3,9 | 5,1 | 5,7 | 6,1 | 7,1 | 6,4 | 4,8 | 3,2 | 2,0 | 1,4 | Ø | 4,2 | | | Rainy days (d) | 10,5 | 9,4 | 12,9 | 12,2 | 13,9 | 14,0 | 13,9 | 13,2 | 11,6 | 10,1 | 10,8 | 11,6 | | 144,1 | | | Humidity (%) | 80 | 77 | 73 | 71 | 72 | 73 | 72 | 75 | 79 | 81 | 82 | 81 | Ø | 76,3 | | Temperature | | | | | | | | | | | | | | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | | Precipitation | 64 | 63 | 92 | 110 | 156 | 166 | 187 | 179 | 147 | 96 | 96 | 87 | | | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
City breakdown
Today, the city is divided into three districts (West, Centrum and East), which in turn are subdivided into neighbourhood groups and quarters. The districts date back to the city amalgamation of 1918. The West district covers most of the area of the former municipality of Straubenzell, the Centrum district that of the former city of St. Gallen and the East district the area of the former municipality of Tablat. Exceptions are St. Georgen, which had belonged for the most part to the municipality of Tablat, and the western parts of Riethüsli, which were part of Straubenzell; these areas were added to the Kreis Centrum. The districts were first divided into 31 statistical quarters in 1966. In 1996, an intermediate level was introduced and the statistical quarters were grouped into 14 groups of quarters. This division is used in the statistics portal of the city of St.Gallen for evaluations of the building and housing statistics (GWS) as well as the population statistics.
The statistical quarters and quarter groups sometimes do not correspond to the perception of the residents, as some areas (such as the Schoren in quarter group Lachen, Dreilinden in quarter group Südostquartier) are assigned to a quarter group that is separated from it topographically or in terms of traffic. This difference is reflected in the boundaries of the 18 quarters represented by the St. Gallen neighbourhood associations, which are presented in a publication by the Office for Social Affairs of the City of St. Gallen and represent the neighbourhood boundaries relevant to residents in their daily lives. The quarters do not have any political rights.
| Circle | Neighborhood Group | BFS code | Population end 2019 | Statistical quarters |
| Circle West The West district extends from Lachen, Schoren and Haggen to Winkeln and Gründenmoos. | Angle | 3203011 | 4'422 | 101 Hafnersberg102 Breitfeld - Gründenmoos103 Winkeln North - Industry104 Winkeln South105 Gübsensee106 Chräzeren107 Altenwegen |
| The Bruges | 3203012 | 12'635 | 108 Sittertobel109 Bruggen - Zürcherstrasse110 Boppartshof - Hinterberg111 Haggen - Oberstrasse - Langweid112 Moos - Waldacker - Lerchenfeld |
| Laughter | 3203013 | 6'851 | 113 Vonwil - Lachen - Schoren |
| Circle Centrum The centre stretches from Rosenberg into the city centre to St. Georgen and Riethüsli. | Rosenberg | 3203021 | 4'054 | 201 Hölzli - Joosrüti202 Rosenberg - Kreuzbleiche |
| Riethüsli | 3203022 | 4'139 | 203 Riethüsli |
| St. Georgen | 3203023 | 5'031 | 204 St. Georgen - Bernegg209 St. Georgen - Bach210 Stuelegg - Rüti |
| Downtown | 3203024 | 2'491 | 205 St. Leonhard-East206 Old Town |
| Northeast Quarter | 3203025 | 3'190 | 207 St. Jacob |
| Southeast Quarter | 3203026 | 4'333 | 208 Linsebühl - Dreilinden |
| East circle The eastern part of the city begins at St. Fiden and extends in the direction of Rotmonten as well as Notkersegg and Neudorf. | Rotmonten | 3203031 | 2'649 | 301 Rotmonten |
| Langgass Holy Cross | 3203032 | 7'638 | 302 Langgass - Heiligkreuz |
| St. Fiden | 3203033 | 7'977 | 303 St. Fiden - Krontal |
| Notkersegg | 3203034 | 1'755 | 304 Notkersegg305 Kurzegg - Rank306 Hub - Schaugentobel |
| New Village | 3203035 | 8'454 | 307 Achslen - Wilen308 Stephanshorn - Zil - Kesselhalden |
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The following municipalities border the area of the city of St. Gallen: Gossau to the west, Gaiserwald and Wittenbach to the north, and Mörschwil, Untereggen and Eggersriet to the east. To the south, the city borders the canton of Appenzell Ausserrhoden with the municipalities of Herisau, Stein, Teufen and Speicher.