Reference Data in Koriyama 11 indicators covering reference data for Koriyama. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 228.85 Degree days 2025 up 60.8% 463rd Cooling and heating degree days - Cities and FUAs — Change in cooling 106.42 Degree days 2025 up 435.8% 176th Cooling and heating degree days - Cities and FUAs 2,564 Degree days 2025 up 11.7% 155th Cooling and heating degree days - Cities and FUAs — Change in heating -29.24 Degree days 2025 up 90.2% 157th Precipitation - Cities and FUAs — Extreme precipitation days 16.9 Days per year 2024 up 16.7% 244th Precipitation - Cities and FUAs — Change in extreme precipitation 2.09 Days per year 2024 up 743.0% 457th Dependency ratio - Cities and FUAs 44.7 Percentage of population aged 15-64 years 2020 up 43.3% 86th Wind threats - Cities and FUAs — Exposure to wind threats 6.62 Percentage of area 2023 down 93.4% 220th Coastal flooding - Cities and FUAs — Built-up area exposure to 0 Percentage of built-up area 2022 — 277th Internet speed - Cities and FUAs — Downloading speed 0.3 Percentage of national value 2025 down 94.9% 877th Internet speed - Cities and FUAs — Uploading speed 8.2 Percentage of national value 2025 down 39.7% 541st