Reference Data in Busan 11 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% 324th Cooling and heating degree days - Cities and FUAs — Change in cooling 148.68 Degree days 2025 up 766.2% 103rd Cooling and heating degree days - Cities and FUAs 1,538 Degree days 2025 down 0.3% 668th Cooling and heating degree days - Cities and FUAs — Change in heating -180.9 Degree days 2025 down 2.8% 427th Precipitation - Cities and FUAs — Extreme precipitation days 25.08 Days per year 2024 up 10.3% 117th Precipitation - Cities and FUAs — Change in extreme precipitation 4.33 Days per year 2024 up 116.8% 206th Dependency ratio - Cities and FUAs 30.9 Percentage of population aged 15-64 years 2023 up 86.1% 522nd 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% 1082nd Internet speed - Cities and FUAs — Uploading speed -6.6 Percentage of national value 2025 down 100.0% 847th