Reference Data in Leiden 11 indicators covering reference data for Leiden. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 9.02 Degree days 2025 down 65.4% 1092nd Cooling and heating degree days - Cities and FUAs — Change in cooling -11.95 Degree days 2025 down 334.1% 737th Cooling and heating degree days - Cities and FUAs 1,613 Degree days 2025 down 8.2% 619th Cooling and heating degree days - Cities and FUAs — Change in heating -387.65 Degree days 2025 down 59.5% 789th Precipitation - Cities and FUAs — Extreme precipitation days 2.5 Days per year 2024 up 66.6% 1063rd Precipitation - Cities and FUAs — Change in extreme precipitation 0.6384 Days per year 2024 up 277.1% 736th Dependency ratio - Cities and FUAs 28.9 Percentage of population aged 15-64 years 2025 up 18.4% 636th Wind threats - Cities and FUAs — Exposure to wind threats 100 Percentage of area 2023 unchanged 1st Coastal flooding - Cities and FUAs — Built-up area exposure to 83.56 Percentage of built-up area 2022 up 0.8% 15th Internet speed - Cities and FUAs — Downloading speed 4.7 Percentage of national value 2025 up 42.4% 696th Internet speed - Cities and FUAs — Uploading speed -9.3 Percentage of national value 2025 up 75.5% 891st