Rank 3 of 80
23.9 hot days a year, average 2016–2025. In 1951–1960 it was 9.0.
Karlsruhe has no historical counterpart: no major German city was as hot in 1951–1960 as Karlsruhe is today.
| Period | Hot days | Rank | |
|---|---|---|---|
| 1951–1960 | 9.0 | 3 | |
| 1961–1970 | 9.9 | 6 | |
| 1971–1980 | 10.1 | 3 | |
| 1981–1990 | 13.1 | 1 | |
| 1991–2000 | 18.1 | 1 | |
| 2001–2010 | 20.8 | 1 | |
| 2006–2015 | 16.8 | 3 | |
| 2016–2025 | 23.9 | 3 |
This figure describes the location of Karlsruhe. 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, Karlsruhe has the most green where people live.
Karlsruhe has a published heat action plan: „Hitzeaktionsplan der Stadt Karlsruhe – Maßnahmen für gesundheitlichen Hitzeschutz“ (2025).
Research as of 24 October 2026. Corrections and tips to kontakt@julianzuber.de.
For Karlsruhe this has been analysed across the city area: trees, land, planting search areas. deutschland-hitzesicher.de/karlsruhe-hitzesicher (in German)
Each city has its own access to its map. Enquiries to kontakt@julianzuber.de.