Reference Data in Cardiff 11 indicators covering reference data for Cardiff. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 3.27 Degree days 2025 up 48.8% 1170th Cooling and heating degree days - Cities and FUAs — Change in cooling -3.44 Degree days 2025 up 23.7% 542nd Cooling and heating degree days - Cities and FUAs 1,408 Degree days 2025 down 23.3% 727th Cooling and heating degree days - Cities and FUAs — Change in heating -613.91 Degree days 2025 down 228.0% 1175th Precipitation - Cities and FUAs — Extreme precipitation days 9.29 Days per year 2024 up 209.5% 497th Precipitation - Cities and FUAs — Change in extreme precipitation 3.6 Days per year 2024 up 234.1% 268th Dependency ratio - Cities and FUAs 21.1 Percentage of population aged 15-64 years 2024 up 6.0% 998th 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 4.89 Percentage of built-up area 2022 up 5.5% 71st Internet speed - Cities and FUAs — Downloading speed -2.7 Percentage of national value 2025 down 117.3% 976th Internet speed - Cities and FUAs — Uploading speed -44.5 Percentage of national value 2025 down 487.0% 1267th