Reference Data in Heidelberg 11 indicators covering reference data for Heidelberg. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 62.35 Degree days 2025 down 60.2% 736th Cooling and heating degree days - Cities and FUAs — Change in cooling -8.37 Degree days 2025 down 109.7% 662nd Cooling and heating degree days - Cities and FUAs 1,932 Degree days 2025 down 5.2% 427th Cooling and heating degree days - Cities and FUAs — Change in heating -405.14 Degree days 2025 down 35.2% 850th Precipitation - Cities and FUAs — Extreme precipitation days 5.2 Days per year 2024 up 419.8% 729th Precipitation - Cities and FUAs — Change in extreme precipitation 2.06 Days per year 2024 up 196.8% 463rd Dependency ratio - Cities and FUAs 23.5 Percentage of population aged 15-64 years 2025 up 4.4% 910th 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 9.5 Percentage of national value 2025 up 371.4% 499th Internet speed - Cities and FUAs — Uploading speed -28.8 Percentage of national value 2025 up 33.6% 1155th