Reference Data in Rotterdam 11 indicators covering reference data for Rotterdam. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 14.35 Degree days 2025 down 60.5% 1032nd Cooling and heating degree days - Cities and FUAs — Change in cooling -14.38 Degree days 2025 down 289.0% 775th Cooling and heating degree days - Cities and FUAs 1,542 Degree days 2025 down 13.4% 666th Cooling and heating degree days - Cities and FUAs — Change in heating -480.13 Degree days 2025 down 99.2% 1039th Precipitation - Cities and FUAs — Extreme precipitation days 2.05 Days per year 2024 down 6.3% 1112th Precipitation - Cities and FUAs — Change in extreme precipitation 0.2815 Days per year 2024 down 32.7% 804th Dependency ratio - Cities and FUAs 27.8 Percentage of population aged 15-64 years 2025 up 9.4% 694th Wind threats - Cities and FUAs — Exposure to wind threats 73.93 Percentage of area 2023 up 0.6% 101st Coastal flooding - Cities and FUAs — Built-up area exposure to 69.31 Percentage of built-up area 2022 down 1.0% 22nd Internet speed - Cities and FUAs — Downloading speed 5.2 Percentage of national value 2025 up 30.0% 672nd Internet speed - Cities and FUAs — Uploading speed -4.8 Percentage of national value 2025 up 47.3% 823rd