Reference Data in Ulsan 15 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% 285th Cooling and heating degree days - Cities and FUAs — Change in cooling 172.09 Degree days 2025 up 1,056.8% 74th Cooling and heating degree days - Cities and FUAs 1,567 Degree days 2025 down 0.5% 652nd Cooling and heating degree days - Cities and FUAs — Change in heating -191.44 Degree days 2025 down 4.7% 444th Cooling and heating degree days - Cities and FUAs — Change in heating 6.07 % change on previous year 2025 up 110.8% 410th Cooling and heating degree days - Cities and FUAs, annual growth rate 0.7963 % change on previous year 2025 up 119.9% 407th Cooling and heating degree days - Cities and FUAs — Change in cooling -13.96 % change on previous year 2025 down 151.2% 144th Cooling and heating degree days - Cities and FUAs — Cooling degree -6.46 % change on previous year 2025 down 298.6% 157th Precipitation - Cities and FUAs — Extreme precipitation days 23.88 Days per year 2024 up 17.9% 130th Precipitation - Cities and FUAs — Change in extreme precipitation 5.53 Days per year 2024 up 190.0% 146th Dependency ratio - Cities and FUAs 21.2 Percentage of population aged 15-64 years 2023 up 125.5% 984th 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% 782nd Internet speed - Cities and FUAs — Uploading speed 4 Percentage of national value 2025 down 86.2% 626th