Reference Data in Haarlem 11 indicators covering reference data for Haarlem. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 5.4 Degree days 2025 down 68.6% 1141st Cooling and heating degree days - Cities and FUAs — Change in cooling -8.99 Degree days 2025 down 420.1% 680th Cooling and heating degree days - Cities and FUAs 1,588 Degree days 2025 down 7.6% 637th Cooling and heating degree days - Cities and FUAs — Change in heating -378.46 Degree days 2025 down 52.5% 769th Precipitation - Cities and FUAs — Extreme precipitation days 3 Days per year 2024 up 140.0% 962nd Precipitation - Cities and FUAs — Change in extreme precipitation 0.5673 Days per year 2024 up 147.9% 755th Dependency ratio - Cities and FUAs 31.5 Percentage of population aged 15-64 years 2025 up 6.8% 488th 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 48.11 Percentage of built-up area 2022 up 1.3% 29th Internet speed - Cities and FUAs — Downloading speed 6.8 Percentage of national value 2025 up 25.9% 603rd Internet speed - Cities and FUAs — Uploading speed 2 Percentage of national value 2025 up 105.4% 676th