Reference Data in Dortmund 11 indicators covering reference data for Dortmund. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 34.18 Degree days 2025 down 44.8% 854th Cooling and heating degree days - Cities and FUAs — Change in cooling -8.86 Degree days 2025 down 146.9% 676th Cooling and heating degree days - Cities and FUAs 1,818 Degree days 2025 down 9.5% 487th Cooling and heating degree days - Cities and FUAs — Change in heating -471.17 Degree days 2025 down 67.7% 1022nd Precipitation - Cities and FUAs — Extreme precipitation days 4.6 Days per year 2024 up 27.8% 781st Precipitation - Cities and FUAs — Change in extreme precipitation 1.83 Days per year 2024 up 120.4% 503rd Dependency ratio - Cities and FUAs 31.5 Percentage of population aged 15-64 years 2025 up 2.6% 488th Wind threats - Cities and FUAs — Exposure to wind threats 0 Percentage of area 2023 — 273rd Coastal flooding - Cities and FUAs — Built-up area exposure to 0 Percentage of built-up area 2022 — 277th Internet speed - Cities and FUAs — Downloading speed 7.3 Percentage of national value 2025 down 68.3% 581st Internet speed - Cities and FUAs — Uploading speed -20.4 Percentage of national value 2025 down 33.3% 1061st