Reference Data in Portsmouth 11 indicators covering reference data for Portsmouth. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 1.37 Degree days 2025 down 61.8% 1208th Cooling and heating degree days - Cities and FUAs — Change in cooling -7.89 Degree days 2025 down 38.9% 651st Cooling and heating degree days - Cities and FUAs 1,468 Degree days 2025 down 8.9% 696th Cooling and heating degree days - Cities and FUAs — Change in heating -363.26 Degree days 2025 down 65.9% 743rd Precipitation - Cities and FUAs — Extreme precipitation days 5 Days per year 2024 up 400.0% 745th Precipitation - Cities and FUAs — Change in extreme precipitation 2.97 Days per year 2024 up 387.1% 328th Dependency ratio - Cities and FUAs 25.6 Percentage of population aged 15-64 years 2024 up 10.3% 802nd 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 20.47 Percentage of built-up area 2022 up 0.5% 44th Internet speed - Cities and FUAs — Downloading speed 15.8 Percentage of national value 2025 down 56.0% 300th Internet speed - Cities and FUAs — Uploading speed 44.4 Percentage of national value 2025 up 2,214.3% 95th