Cooling and heating degree days - Cities and FUAs (heating Cities) in İzmir
İzmir: Cooling and heating degree days - Cities and FUAs (heating Cities) was 735.29 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in İzmir, 1950–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degree days.
Analysis
In 2025, cooling and heating degree days - cities and fuas in İzmir stood at 735.29 Degree days. That is the lowest value across all 76 years on record.
That represents a change of down 21.6% on the previous year and down 35.2% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in İzmir peaked at 1,482 Degree days in 1992 and was at its lowest, 735.29 Degree days, in 2025.
İzmir ranks 980th of 1314 regions on this measure, 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 (heating Cities) in İzmir, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 1,140 Degree days | — |
| 1951 | 963.24 Degree days | -15.5% |
| 1952 | 962.93 Degree days | -0.0% |
| 1953 | 1,394 Degree days | +44.7% |
| 1954 | 1,289 Degree days | -7.5% |
| 1955 | 900.29 Degree days | -30.1% |
| 1956 | 1,365 Degree days | +51.6% |
| 1957 | 1,180 Degree days | -13.5% |
| 1958 | 1,020 Degree days | -13.6% |
| 1959 | 1,246 Degree days | +22.2% |
| 1960 | 960.64 Degree days | -22.9% |
| 1961 | 1,157 Degree days | +20.5% |
| 1962 | 1,006 Degree days | -13.1% |
| 1963 | 1,076 Degree days | +6.9% |
| 1964 | 1,312 Degree days | +22.0% |
| 1965 | 1,222 Degree days | -6.9% |
| 1966 | 895.41 Degree days | -26.7% |
| 1967 | 1,277 Degree days | +42.6% |
| 1968 | 1,141 Degree days | -10.6% |
| 1969 | 1,236 Degree days | +8.3% |
| 1970 | 1,067 Degree days | -13.7% |
| 1971 | 1,167 Degree days | +9.3% |
| 1972 | 1,314 Degree days | +12.6% |
| 1973 | 1,226 Degree days | -6.7% |
| 1974 | 1,302 Degree days | +6.2% |
| 1975 | 1,300 Degree days | -0.1% |
| 1976 | 1,300 Degree days | +0.0% |
| 1977 | 1,164 Degree days | -10.5% |
| 1978 | 1,158 Degree days | -0.5% |
| 1979 | 1,085 Degree days | -6.3% |
| 1980 | 1,278 Degree days | +17.8% |
| 1981 | 1,116 Degree days | -12.7% |
| 1982 | 1,270 Degree days | +13.9% |
| 1983 | 1,249 Degree days | -1.7% |
| 1984 | 1,162 Degree days | -7.0% |
| 1985 | 1,138 Degree days | -2.0% |
| 1986 | 1,133 Degree days | -0.5% |
| 1987 | 1,321 Degree days | +16.6% |
| 1988 | 1,264 Degree days | -4.3% |
| 1989 | 1,249 Degree days | -1.2% |
| 1990 | 1,134 Degree days | -9.2% |
| 1991 | 1,285 Degree days | +13.3% |
| 1992 | 1,482 Degree days | +15.4% |
| 1993 | 1,319 Degree days | -11.0% |
| 1994 | 1,139 Degree days | -13.6% |
| 1995 | 1,180 Degree days | +3.6% |
| 1996 | 1,236 Degree days | +4.7% |
| 1997 | 1,306 Degree days | +5.6% |
| 1998 | 1,166 Degree days | -10.7% |
| 1999 | 972.02 Degree days | -16.6% |
| 2000 | 1,275 Degree days | +31.1% |
| 2001 | 1,093 Degree days | -14.2% |
| 2002 | 1,136 Degree days | +3.9% |
| 2003 | 1,342 Degree days | +18.1% |
| 2004 | 1,198 Degree days | -10.7% |
| 2005 | 1,188 Degree days | -0.8% |
| 2006 | 1,251 Degree days | +5.2% |
| 2007 | 1,131 Degree days | -9.5% |
| 2008 | 1,116 Degree days | -1.4% |
| 2009 | 1,002 Degree days | -10.2% |
| 2010 | 849.44 Degree days | -15.2% |
| 2011 | 1,364 Degree days | +60.6% |
| 2012 | 1,186 Degree days | -13.0% |
| 2013 | 1,046 Degree days | -11.8% |
| 2014 | 844.07 Degree days | -19.3% |
| 2015 | 1,134 Degree days | +34.4% |
| 2016 | 1,082 Degree days | -4.6% |
| 2017 | 1,107 Degree days | +2.3% |
| 2018 | 892.12 Degree days | -19.4% |
| 2019 | 963.41 Degree days | +8.0% |
| 2020 | 1,002 Degree days | +4.0% |
| 2021 | 980.73 Degree days | -2.1% |
| 2022 | 1,112 Degree days | +13.4% |
| 2023 | 950.84 Degree days | -14.5% |
| 2024 | 938.35 Degree days | -1.3% |
| 2025 | 735.29 Degree days | -21.6% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 1,146 Degree days | 900.29 Degree days | 1,394 Degree days | 10 |
| 1960s | 1,128 Degree days | 895.41 Degree days | 1,312 Degree days | 10 |
| 1970s | 1,208 Degree days | 1,067 Degree days | 1,314 Degree days | 10 |
| 1980s | 1,218 Degree days | 1,116 Degree days | 1,321 Degree days | 10 |
| 1990s | 1,222 Degree days | 972.02 Degree days | 1,482 Degree days | 10 |
| 2000s | 1,173 Degree days | 1,002 Degree days | 1,342 Degree days | 10 |
| 2010s | 1,047 Degree days | 844.07 Degree days | 1,364 Degree days | 10 |
| 2020s | 953.25 Degree days | 735.29 Degree days | 1,112 Degree days | 6 |
More reference data data for İzmir
- Cooling and heating degree days - Cities and FUAs — Cooling degree -31.16 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -88.9 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs, annual growth rate -21.64 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -80.66 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -454.81 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling 29.94 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree 529.52 Degree days (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 10.36 Days per year (2024)
- Precipitation - Cities and FUAs — Change in extreme precipitation 1.13 Days per year (2024)
- Exposure to extreme temperature — Annual temperature change 1.4 Degrees celsius (2023)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in İzmir?
- Cooling and heating degree days - cities and fuas in İzmir was 735.29 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 İzmir?
- The highest recorded value was 1,482 Degree days in 1992.
- What is the lowest cooling and heating degree days - cities and fuas recorded in İzmir?
- The lowest recorded value was 735.29 Degree days in 2025.
- How does İzmir rank for cooling and heating degree days - cities and fuas?
- İzmir ranks 980th out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in İzmir?
- Over the last ten years it is down 35.2%. The long-run trend across the full record is falling.
- Where does this İzmir 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