Reference Data in Heilbronn 11 indicators covering reference data for Heilbronn. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 62.75 Degree days 2025 down 61.4% 734th Cooling and heating degree days - Cities and FUAs — Change in cooling -8.8 Degree days 2025 down 109.6% 674th Cooling and heating degree days - Cities and FUAs 1,958 Degree days 2025 down 4.3% 411th Cooling and heating degree days - Cities and FUAs — Change in heating -396.75 Degree days 2025 down 28.2% 826th Precipitation - Cities and FUAs — Extreme precipitation days 2 Days per year 2024 down 12.5% 1114th Precipitation - Cities and FUAs — Change in extreme precipitation -1.34 Days per year 2024 down 27.1% 1152nd Dependency ratio - Cities and FUAs 28.7 Percentage of population aged 15-64 years 2025 down 6.8% 650th 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 2 Percentage of national value 2025 up 211.1% 816th Internet speed - Cities and FUAs — Uploading speed -34.1 Percentage of national value 2025 down 40.3% 1203rd