Cooling and heating degree days - Cities and FUAs in Ulsan
Ulsan: Cooling and heating degree days - Cities and FUAs was 1,567 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Ulsan, 1950–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degree days.
Analysis
Ulsan recorded 1,567 Degree days for cooling and heating degree days - cities and fuas in 2025.
The figure is up 0.8% on the previous year and down 0.5% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Ulsan peaked at 2,178 Degree days in 1956 and was at its lowest, 1,514 Degree days, in 1998.
That places Ulsan 652nd out of 1314 regions with data for 2025, putting it in the middle of the range.
The long-run direction has been consistently falling across the 76 years of available data.
Cooling and heating degree days - Cities and FUAs in Ulsan, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 1,805 Degree days | — |
| 1951 | 1,820 Degree days | +0.8% |
| 1952 | 1,924 Degree days | +5.7% |
| 1953 | 1,917 Degree days | -0.3% |
| 1954 | 1,705 Degree days | -11.1% |
| 1955 | 1,874 Degree days | +9.9% |
| 1956 | 2,178 Degree days | +16.2% |
| 1957 | 1,939 Degree days | -11.0% |
| 1958 | 1,748 Degree days | -9.9% |
| 1959 | 1,711 Degree days | -2.1% |
| 1960 | 1,815 Degree days | +6.1% |
| 1961 | 1,821 Degree days | +0.3% |
| 1962 | 1,861 Degree days | +2.2% |
| 1963 | 2,029 Degree days | +9.0% |
| 1964 | 1,801 Degree days | -11.2% |
| 1965 | 2,010 Degree days | +11.6% |
| 1966 | 1,897 Degree days | -5.6% |
| 1967 | 1,993 Degree days | +5.0% |
| 1968 | 1,872 Degree days | -6.0% |
| 1969 | 2,104 Degree days | +12.4% |
| 1970 | 2,030 Degree days | -3.5% |
| 1971 | 1,901 Degree days | -6.3% |
| 1972 | 1,736 Degree days | -8.7% |
| 1973 | 1,820 Degree days | +4.8% |
| 1974 | 1,930 Degree days | +6.1% |
| 1975 | 1,786 Degree days | -7.5% |
| 1976 | 1,894 Degree days | +6.0% |
| 1977 | 1,821 Degree days | -3.8% |
| 1978 | 1,798 Degree days | -1.3% |
| 1979 | 1,704 Degree days | -5.2% |
| 1980 | 2,031 Degree days | +19.2% |
| 1981 | 2,101 Degree days | +3.4% |
| 1982 | 1,776 Degree days | -15.5% |
| 1983 | 1,863 Degree days | +4.9% |
| 1984 | 2,047 Degree days | +9.9% |
| 1985 | 1,959 Degree days | -4.3% |
| 1986 | 1,986 Degree days | +1.4% |
| 1987 | 1,797 Degree days | -9.5% |
| 1988 | 1,891 Degree days | +5.3% |
| 1989 | 1,588 Degree days | -16.0% |
| 1990 | 1,578 Degree days | -0.6% |
| 1991 | 1,784 Degree days | +13.0% |
| 1992 | 1,706 Degree days | -4.4% |
| 1993 | 1,816 Degree days | +6.5% |
| 1994 | 1,679 Degree days | -7.6% |
| 1995 | 1,799 Degree days | +7.2% |
| 1996 | 1,873 Degree days | +4.1% |
| 1997 | 1,651 Degree days | -11.8% |
| 1998 | 1,514 Degree days | -8.3% |
| 1999 | 1,712 Degree days | +13.1% |
| 2000 | 1,768 Degree days | +3.2% |
| 2001 | 1,760 Degree days | -0.4% |
| 2002 | 1,658 Degree days | -5.8% |
| 2003 | 1,688 Degree days | +1.8% |
| 2004 | 1,546 Degree days | -8.4% |
| 2005 | 1,912 Degree days | +23.6% |
| 2006 | 1,641 Degree days | -14.2% |
| 2007 | 1,519 Degree days | -7.4% |
| 2008 | 1,692 Degree days | +11.4% |
| 2009 | 1,606 Degree days | -5.1% |
| 2010 | 1,844 Degree days | +14.8% |
| 2011 | 1,856 Degree days | +0.6% |
| 2012 | 1,927 Degree days | +3.9% |
| 2013 | 1,791 Degree days | -7.1% |
| 2014 | 1,641 Degree days | -8.3% |
| 2015 | 1,576 Degree days | -4.0% |
| 2016 | 1,651 Degree days | +4.8% |
| 2017 | 1,738 Degree days | +5.3% |
| 2018 | 1,769 Degree days | +1.8% |
| 2019 | 1,537 Degree days | -13.1% |
| 2020 | 1,550 Degree days | +0.8% |
| 2021 | 1,524 Degree days | -1.6% |
| 2022 | 1,654 Degree days | +8.5% |
| 2023 | 1,614 Degree days | -2.4% |
| 2024 | 1,555 Degree days | -3.7% |
| 2025 | 1,567 Degree days | +0.8% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 1,862 Degree days | 1,705 Degree days | 2,178 Degree days | 10 |
| 1960s | 1,920 Degree days | 1,801 Degree days | 2,104 Degree days | 10 |
| 1970s | 1,842 Degree days | 1,704 Degree days | 2,030 Degree days | 10 |
| 1980s | 1,904 Degree days | 1,588 Degree days | 2,101 Degree days | 10 |
| 1990s | 1,711 Degree days | 1,514 Degree days | 1,873 Degree days | 10 |
| 2000s | 1,679 Degree days | 1,519 Degree days | 1,912 Degree days | 10 |
| 2010s | 1,733 Degree days | 1,537 Degree days | 1,927 Degree days | 10 |
| 2020s | 1,577 Degree days | 1,524 Degree days | 1,654 Degree days | 6 |
More reference data data for Ulsan
- Cooling and heating degree days - Cities and FUAs — Cooling degree 403.84 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling 172.09 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -191.44 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating 6.07 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs, annual growth rate 0.7963 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -13.96 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree -6.46 % change on previous year (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 23.88 Days per year (2024)
- Precipitation - Cities and FUAs — Change in extreme precipitation 5.53 Days per year (2024)
- Dependency ratio - Cities and FUAs 21.2 Percentage of population aged 15-64 years (2023)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Ulsan?
- Cooling and heating degree days - cities and fuas in Ulsan was 1,567 Degree days in 2025, according to Organisation for Economic Co-operation and Development.
- What is the highest cooling and heating degree days - cities and fuas recorded in Ulsan?
- The highest recorded value was 2,178 Degree days in 1956.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Ulsan?
- The lowest recorded value was 1,514 Degree days in 1998.
- How does Ulsan rank for cooling and heating degree days - cities and fuas?
- Ulsan ranks 652nd out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Ulsan?
- Over the last ten years it is down 0.5%. The long-run trend across the full record is falling.
- Where does this Ulsan data come from?
- The figures come from Organisation for Economic Co-operation and Development, published as part of Cooling and heating degree days - Cities and FUAs. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 76 observations, free to reuse under OECD Terms and Conditions (attribution required).
About this data
This dataset provides indicators of Cooling and Heating Degree Days (CDDs and HDDs) for FUAs and cities. CDDs and HDDs are measurements used to estimate energy usage based on outdoor temperature. CDD measures the demand for cooling, while HDD measures the demand for heating, both calculated relative to a baseline temperature. Data sources and methodology The indicators use 0.1-degree resolution grids from the ERA5-Land dataset. ERA5-Land is used as it provides harmonised, globally consistent coverage at fine spatial resolution (0.1 degree), enabling the production of comparable subnational indicators also where national meteorological data are not available at the required scale. Annual CDDs are the sum over a year of the differences between the daily mean outdoor air temperature and the threshold temperature when the outdoor temperature is above the threshold temperature. HDDs are the sum over a year of the differences between the threshold temperature and the daily mean outdoor air temperature when the outdoor temperature is below the threshold temperature. Threshold temperatures are set to 22°C for CDDs and 15°C for HDDs. These estimates may differ from official subnational climate statistics due to differences in methodological approaches, such as the use of reanalysis based top down modelling versus in situ observations, along with variations in input data sources, spatial resolution, and the models and algorithms used to generate temperature estimates. Defining FUAs and cities The OECD, in cooperation with the EU, has developed a harmonised definition of functional urban areas (FUAs) to capture the economic and functional reach of cities based on daily commuting patterns (OECD, 2012). FUAs consist of: A city – defined by urban centres in the degree of urbanisation, adapted to the closest local administrative units to define a city. A commuting zone – including all local areas where at least 15% of employed residents work in the city. The delineation process includes: Assigning municipalities surrounded by a single FUA to that FUA. Excluding non-contiguous municipalities. The correspondence table between SAUs and FUAs/cities is available in parquet and csv format. The definition identifies 1 272 FUAs and 1 269 cities in all OECD member countries except Costa Rica and three accession countries. Cite this dataset OECD Regions, cities and local areas database (Cooling and heating degree days - Cities and FUAs), http://oe.cd/geostats Further information OECD Local Data Portal OECD Regions and Cities at a Glance For questions and/or comments, please email CitiesStat@oecd.org