Reference Data in Busan 15 indicators covering reference data for Busan. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 367.03 Degree days 2025 up 87.2% 323rd Cooling and heating degree days - Cities and FUAs — Change in cooling 148.68 Degree days 2025 up 766.2% 102nd Cooling and heating degree days - Cities and FUAs 1,538 Degree days 2025 down 0.3% 667th Cooling and heating degree days - Cities and FUAs — Change in heating -180.9 Degree days 2025 down 2.8% 425th Cooling and heating degree days - Cities and FUAs — Change in heating 3.36 % change on previous year 2025 up 107.6% 428th Cooling and heating degree days - Cities and FUAs, annual growth rate 0.4106 % change on previous year 2025 up 112.2% 415th Cooling and heating degree days - Cities and FUAs — Change in cooling -26.68 % change on previous year 2025 down 225.0% 180th Cooling and heating degree days - Cities and FUAs — Cooling degree -12.85 % change on previous year 2025 down 503.1% 242nd Precipitation - Cities and FUAs — Extreme precipitation days 25.08 Days per year 2024 up 10.3% 116th Precipitation - Cities and FUAs — Change in extreme precipitation 4.33 Days per year 2024 up 116.8% 205th Dependency ratio - Cities and FUAs 30.9 Percentage of population aged 15-64 years 2023 up 86.1% 519th Wind threats - Cities and FUAs — Exposure to wind threats 75.96 Percentage of area 2023 up 41.6% 100th Coastal flooding - Cities and FUAs — Built-up area exposure to 4.16 Percentage of built-up area 2022 up 64.2% 77th Internet speed - Cities and FUAs — Downloading speed -6.5 Percentage of national value 2025 up 70.0% 1073rd Internet speed - Cities and FUAs — Uploading speed -6.6 Percentage of national value 2025 down 100.0% 838th