Geographical location
Detmold is located in the East Westphalia-Lippe region in the east of North Rhine-Westphalia on the edge of the Teutoburg Forest/Eggegebirge nature park. The south of the city area is covered by the Teutoburg Forest, the actual city lies north of it, about 30 kilometres east of Bielefeld and about 100 kilometres southwest of Hanover.
The town area is drained by the Werre, into which the Knochenbach and the Heidenbach flow in the town. The Knochenbach originates from the union of the Wiembecke and the Berlebecke in the district of Heiligenkirchen. Larger standing waters are the Meschesee in Heidenoldendorf and the Donoperteich in Hiddesen.
Geology
The city area, like the entire Lippe region, has a great geological diversity. South of Detmold's city centre runs the ridge of the Osning, which together with the Eggegebirge forms the elongated Teutoburg Forest. The Osning is built up of calcareous sandstones of the Triassic, with many fractures and folds. This fissuring is one reason why there are so many health resorts and mineral water springs in the area. The district of Hiddesen is such a health resort with a gentle climate.
The soils are of medium to very good quality. Towards the end of the last cold period, marl dust was deposited along the northern slope of the Teutoburg Forest and formed loess soils. The glaciers had advanced as far as there. The predominant subsoil is sandstone and mudstone from the Mesozoic. On it are predominantly Podsol brown earths and Pseudogley brown earths. In the northwestern part of the city, the Keuper hills of the Lipperland dominate. Along the Werre river, alluvial soils run through the urban area from the southeast to the northwest. In the higher areas of the Osning ridge, the upper layer consists of the shell limestone, in which fossils can often be found.
A well-known geologist who explored the sandstones of the Teutoburg Forest was the grammar school professor Otto Weerth.
Exhibits on the geology of Detmold are on display in the Lippisches Landesmuseum or can be found there in the collection.
The suitability of the urban area of Detmold for the use of geothermal heat sources by means of geothermal probes and heat recovery by heat pump heating systems varies greatly depending on the location. There are locations with low suitability, but also those with very good suitability (cf. the adjacent map).
Extent and use of the urban area
The town, classified as a "large medium-sized town", covers an area of 129.39 square kilometres. The municipal area has a maximum extension both in east-west direction and in north-south direction of about 15.5 kilometers.
| Area by type of use | Agricultural land | Forest area | Building, open space and operating area | Traffic area | Water surface | Sports and green area | otheruse |
| Area in km² | 52,11 | 42,50 | 20,97 | 8,41 | 0,82 | 4,14 | 0,44 |
| Percentage of total area | 40,27 % | 32,85 % | 16,21 % | 6,50 % | 0,63 % | 3,20 % | 0,34 % |
Neighboring communities
Detmold is surrounded only by towns and municipalities of the district Lippe, these are (clockwise starting in the north) Lemgo, Blomberg, Horn-Bad Meinberg, Schlangen, Augustdorf and Lage.
City breakdown
According to § 3 para. 1 of its main statutes, the city of Detmold is divided into the following 27 districts:
| District | Inhabitants | Area [km²] | Population density [Inhabitants/km²] |
| Barkhausen | 00.178 | 05,31 | 0034 |
| Bentrup | 00.367 | 03,25 | 0113 |
| Berlebeck | 02.233 | 12,61 | 0177 |
| Brokhausen | 00.505 | 04,10 | 0123 |
| Detmold-North | 28.017 | 11,80 | 2374 |
| Detmold South |
| Diestelbruch | 02.162 | 04,73 | 0457 |
| Hakedahl/Herberhausen | 02.202 | 03,48 | 0633 |
| Heidenoldendorf | 08.113 | 06,14 | 1321 |
| Heiligenkirchen | 03.143 | 09,99 | 0315 |
| Hiddesen | 07.375 | 11,35 | 0650 |
| Hornoldendorf | 00.145 | 03,92 | 0037 |
| Jerxen-Orbke | 03.252 | 03,01 | 1080 |
| Klüt | 01.672 | 03,01 | 0555 |
| Lossbruch | 00.798 | 01,05 | 0760 |
| Mosebeck | 00.433 | 04,21 | 0103 |
| Niederschönhagen | 00.076 | 02,60 | 0029 |
| Nienhagen | 00.318 | 03,68 | 0086 |
| Niewald | 00.057 | 01,38 | 0041 |
| Oberschönhagen | 00.072 | 04,10 | 0018 |
| Oettern-Bremke | 00.151 | 03,25 | 0046 |
| Pivitsheide V. H. | 03.086 | 03,45 | 0894 |
| Pivitsheide V. L. | 06.414 | 05,90 | 1087 |
| Remmighausen | 01.714 | 03,77 | 0455 |
| Schönemark | 00.211 | 04,50 | 0047 |
| Spork Oakwood | 03.162 | 03,20 | 0988 |
| Vahlhausen | 00.534 | 02,48 | 0215 |
See also: List of places in the district of Lippe
Climate
The Detmold city area belongs to the maritime climate region of northwest Germany. The average annual temperature is about 9 °C, the southern outskirts of the city are colder, while the more northern periphery is warmer than average. Monthly means vary regionally from about 0 °C in January to 17 °C in July/August. The annual precipitation amounts to about 900 millimetres of water column, increasing towards the Teutoburg Forest. The average annual solar radiation is 955 kilowatt hours per square meter.
For the Detmold district Hiddesen, which is situated relatively high and directly at the Teutoburg Forest, the following climate values result, which are cooler and more humid compared to the city centre:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | | | | Max. Temperature (°C) | 2,5 | 4,0 | 8,0 | 12,5 | 17,0 | 20,0 | 22,0 | 22,0 | 18,0 | 14,0 | 7,5 | 4,5 | Ø | 12,7 | | Min. temperature (°C) | −2,0 | −1,9 | 0,1 | 4,0 | 7,0 | 10,0 | 12,0 | 12,0 | 9,5 | 5,5 | 2,5 | −0,5 | Ø | 4,9 | | Temperature (°C) | 0,3 | 0,5 | 4,5 | 7,5 | 12,0 | 15,0 | 17,0 | 16,8 | 14,0 | 9,5 | 4,9 | 2,5 | Ø | 8,8 | | | Precipitation (mm) | 85 | 60 | 70 | 65 | 75 | 82 | 81 | 78 | 70 | 65 | 85 | 95 | | 911 | | | Sunshine hours (h/d) | 1 | 2 | 3 | 5 | 6,2 | 6,2 | 6 | 5,8 | 5 | 3,5 | 1 | 0,8 | Ø | 3,8 | | Te mperature | | | | | | | | | | | | | | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | | Precipitation | 85 | 60 | 70 | 65 | 75 | 82 | 81 | 78 | 70 | 65 | 85 | 95 | | | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
See also: Climate in East Westphalia-Lippe