Reference Data in Saint-Denis 12 indicators covering reference data for Saint-Denis. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 238.84 Degree days 2025 up 9.3% 448th Cooling and heating degree days - Cities and FUAs — Change in cooling 47.93 Degree days 2025 up 73.0% 303rd Cooling and heating degree days - Cities and FUAs 3.81 Degree days 2025 down 52.1% 1264th Cooling and heating degree days - Cities and FUAs — Change in heating -17.7 Degree days 2025 down 30.5% 134th Precipitation - Cities and FUAs — Extreme precipitation days 11 Days per year 2024 up 15.8% 434th Precipitation - Cities and FUAs — Change in extreme precipitation 1.92 Days per year 2024 up 360.4% 486th Dependency ratio - Cities and FUAs 21.8 Percentage of population aged 15-64 years 2022 up 48.3% 969th Wind threats - Cities and FUAs — Exposure to wind threats 99.79 Percentage of area 2023 down 0.2% 79th Coastal flooding - Cities and FUAs — Built-up area exposure to 0 Percentage of built-up area 2022 — 277th Main mode of transport to work - Cities and FUAs — Employed persons 51,739 Persons 2022 up 8.1% 237th Internet speed - Cities and FUAs — Downloading speed 8.2 Percentage of national value 2025 down 61.0% 544th Internet speed - Cities and FUAs — Uploading speed 10.7 Percentage of national value 2025 down 75.8% 470th