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Rank 55 of 80

Hamm

11.7 hot days a year, average 2016–2025. In 1951–1960 it was 3.7.

Grid and weather station typically differ by about 0.9 days. If the value is shifted by that much, the city lies on one of the places 45 to 62. How it was checked.

Hamm has no historical counterpart: no major German city was as hot in 1951–1960 as Hamm is today.

11.7Hot days today
3.7Hot days 1951–1960
19.0hottest year: 2022
51 → 55Rank then and now
22.12026, provisional

2026: 22.1 hot days up to the cut-off date – 1.9 times the decade average. This puts Hamm above its previous record year 2022 (19.0 days). The count covers the first 292 days of the year, up to 19 October. The year is therefore not yet complete, and the figure comes from the daily grid rather than the annual grid, which the DWD only publishes after the end of the year. Over the three most recent years available in both, the two agree on average (+0.18 days); for a single city they typically differ by 1.5 days, in individual cases by up to 6.8. This figure is not included in any decade average or any rank on this page.

010203040195119882025
010203040195119882025
1951–2025, axis 0 to 46 days. Grey: the national median. The same axis as on every other city page – the lines can be compared with one another.

Decade by decade

PeriodHot daysRank
1951–19603.751
1961–19703.755
1971–19805.050
1981–19905.156
1991–20007.459
2001–20108.755
2006–20157.659
2016–202511.755

Context

This figure describes the location of Hamm. No city administration decides on location. On shade over streets, schoolyards and playgrounds, it does.

What can be changed

Location is fixed, the residential surroundings are not

29.9 %of the residential surroundings is tree cover
Rank 60of 80 for green where people live

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.

Examples in the same location

Cities with a similar number of hot days and a similar size to Hamm that have clearly more green where people live:

  1. Hamm11.7 days29.9 %
  2. Bochum11.6 days49.9 %
  3. Mülheim an der Ruhr10.9 days49.1 %
  4. Bonn13.2 days46.8 %

Hot days per year, average 2016–2025, and green where people live. Compared are cities no more than 1.5 hot days apart, at most three times as large or as small, with at least 5.0 percentage points more green. Green also depends on urban form and topography; the comparison shows what occurs in the same location and is not a grade for any administration.

Heat action plan

Hamm has a published heat action plan: „Gemeinsam stark gegen die Hitze – Hitzeaktionsplan Stadt Hamm“ (2026).

Research as of 24 October 2026. Corrections and tips to kontakt@julianzuber.de.

The map for this city

For Hamm this has been analysed across the city area: trees, land, heat stress. deutschland-hitzesicher.de/hamm-hitzesicher (in German)

Each city has its own access to its map. Enquiries to kontakt@julianzuber.de.

Neighbours in the ranking

  1. 53Dortmund11.8
  2. 54Augsburg11.8
  3. 55Hamm11.7
  4. 56Bochum11.6
  5. 57Braunschweig11.6

Hot days per year, average 2016–2025. All 80 at a glance