Reference Data in Aachen 11 indicators covering reference data for Aachen. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 37.37 Degree days 2025 down 35.5% 828th Cooling and heating degree days - Cities and FUAs — Change in cooling 4.82 Degree days 2025 down 81.0% 434th Cooling and heating degree days - Cities and FUAs 2,128 Degree days 2025 up 0.9% 328th Cooling and heating degree days - Cities and FUAs — Change in heating -238.03 Degree days 2025 up 7.2% 530th Precipitation - Cities and FUAs — Extreme precipitation days 6.15 Days per year 2024 up 65.5% 641st Precipitation - Cities and FUAs — Change in extreme precipitation 3.7 Days per year 2024 up 191.4% 262nd Dependency ratio - Cities and FUAs 26.9 Percentage of population aged 15-64 years 2025 up 3.9% 747th 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 -0.4 Percentage of national value 2025 down 102.9% 906th Internet speed - Cities and FUAs — Uploading speed -33.3 Percentage of national value 2025 down 291.8% 1199th