Reference Data in Zwolle 11 indicators covering reference data for Zwolle. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 15.87 Degree days 2025 down 57.7% 1016th Cooling and heating degree days - Cities and FUAs — Change in cooling -16.56 Degree days 2025 down 426.1% 821st Cooling and heating degree days - Cities and FUAs 2,032 Degree days 2025 up 4.7% 369th Cooling and heating degree days - Cities and FUAs — Change in heating -168.36 Degree days 2025 up 35.4% 404th Precipitation - Cities and FUAs — Extreme precipitation days 3.14 Days per year 2024 — 952nd Precipitation - Cities and FUAs — Change in extreme precipitation 1.73 Days per year 2024 up 222.2% 529th Dependency ratio - Cities and FUAs 26 Percentage of population aged 15-64 years 2025 up 19.8% 782nd Wind threats - Cities and FUAs — Exposure to wind threats 0 Percentage of area 2023 down 100.0% 273rd Coastal flooding - Cities and FUAs — Built-up area exposure to 91.97 Percentage of built-up area 2022 up 0.3% 12th Internet speed - Cities and FUAs — Downloading speed 5.6 Percentage of national value 2025 up 162.2% 655th Internet speed - Cities and FUAs — Uploading speed 17.3 Percentage of national value 2025 up 250.4% 356th