Rank 71 of 80
9.7 hot days a year, average 2016–2025. In 1951–1960 it was 3.2.
Siegen today has the summers Ludwigshafen am Rhein had in the fifties.
| Period | Hot days | Rank | |
|---|---|---|---|
| 1951–1960 | 3.2 | 63 | |
| 1961–1970 | 3.2 | 67 | |
| 1971–1980 | 5.6 | 40 | |
| 1981–1990 | 5.0 | 57 | |
| 1991–2000 | 7.4 | 58 | |
| 2001–2010 | 8.5 | 58 | |
| 2006–2015 | 7.1 | 65 | |
| 2016–2025 | 9.7 | 71 |
This figure describes the location of Siegen. No city administration decides on location. On shade over streets, schoolyards and playgrounds, it does.
What can be changed
This measures the share of residential surroundings covered by trees – from the satellite, weighted by the population of the same 100 m cells as the heat figure above. Both figures therefore apply to the same places and can stand side by side. Parks, cemeteries and gardens count. The city’s stock of street trees requires the tree register.
Among the cities with a similar number of hot days and a similar size, Siegen has the most green where people live.
We did not find a published heat action plan for Siegen. That does not mean there is none: plans may exist internally or be called something else.
Research as of 24 October 2026. Corrections and tips to kontakt@julianzuber.de.
For Siegen this has been analysed across the city area: trees, land, heat stress. deutschland-hitzesicher.de/siegen-hitzesicher (in German)
Each city has its own access to its map. Enquiries to kontakt@julianzuber.de.