Reference Data in Okayama 10 indicators covering reference data for Okayama. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 492.61 Degree days 2025 up 79.8% 214th Cooling and heating degree days - Cities and FUAs — Change in cooling 139.45 Degree days 2025 up 276.2% 125th Cooling and heating degree days - Cities and FUAs 1,211 Degree days 2025 down 3.0% 815th Cooling and heating degree days - Cities and FUAs — Change in heating -182.32 Degree days 2025 down 26.3% 430th Precipitation - Cities and FUAs — Extreme precipitation days 31.33 Days per year 2024 up 75.7% 64th Precipitation - Cities and FUAs — Change in extreme precipitation 13.28 Days per year 2024 up 5,915.7% 18th Wind threats - Cities and FUAs — Exposure to wind threats 0 Percentage of area 2023 — 273rd Coastal flooding - Cities and FUAs — Built-up area exposure to 0.7448 Percentage of built-up area 2022 up 0.7% 117th Internet speed - Cities and FUAs — Downloading speed -8.1 Percentage of national value 2025 up 71.8% 1111th Internet speed - Cities and FUAs — Uploading speed -13.3 Percentage of national value 2025 down 75.0% 957th