Reference Data in Ulsan 11 indicators covering reference data for Ulsan. IndicatorLatest Year10-yr change Rank Cooling and heating degree days - Cities and FUAs — Cooling degree 403.84 Degree days 2025 up 88.9% 286th Cooling and heating degree days - Cities and FUAs — Change in cooling 172.09 Degree days 2025 up 1,056.8% 75th Cooling and heating degree days - Cities and FUAs 1,567 Degree days 2025 down 0.5% 653rd Cooling and heating degree days - Cities and FUAs — Change in heating -191.44 Degree days 2025 down 4.7% 446th Precipitation - Cities and FUAs — Extreme precipitation days 23.88 Days per year 2024 up 17.9% 132nd Precipitation - Cities and FUAs — Change in extreme precipitation 5.53 Days per year 2024 up 190.0% 147th Dependency ratio - Cities and FUAs 21.2 Percentage of population aged 15-64 years 2023 up 125.5% 992nd Wind threats - Cities and FUAs — Exposure to wind threats 100 Percentage of area 2023 up 185.9% 1st Coastal flooding - Cities and FUAs — Built-up area exposure to 0.0163 Percentage of built-up area 2022 up 88.5% 238th Internet speed - Cities and FUAs — Downloading speed 2.7 Percentage of national value 2025 down 25.0% 788th Internet speed - Cities and FUAs — Uploading speed 4 Percentage of national value 2025 down 86.2% 632nd