Cooling and heating degree days - Cities and FUAs in Istanbul
Istanbul: Cooling and heating degree days - Cities and FUAs was 1,016 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Istanbul, 1950–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degree days.
Analysis
The most recent figure for cooling and heating degree days - cities and fuas in Istanbul is 1,016 Degree days, measured in 2025.
The figure is down 1.5% on the previous year and down 15.4% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Istanbul peaked at 1,568 Degree days in 1953 and was at its lowest, 956.82 Degree days, in 2014.
That places Istanbul 877th out of 1314 groups 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 Istanbul, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 1,383 Degree days | — |
| 1951 | 1,196 Degree days | -13.6% |
| 1952 | 1,159 Degree days | -3.1% |
| 1953 | 1,568 Degree days | +35.3% |
| 1954 | 1,539 Degree days | -1.8% |
| 1955 | 1,076 Degree days | -30.1% |
| 1956 | 1,539 Degree days | +43.0% |
| 1957 | 1,367 Degree days | -11.2% |
| 1958 | 1,184 Degree days | -13.4% |
| 1959 | 1,427 Degree days | +20.5% |
| 1960 | 1,171 Degree days | -17.9% |
| 1961 | 1,231 Degree days | +5.1% |
| 1962 | 1,141 Degree days | -7.4% |
| 1963 | 1,341 Degree days | +17.6% |
| 1964 | 1,445 Degree days | +7.7% |
| 1965 | 1,387 Degree days | -4.0% |
| 1966 | 971.61 Degree days | -29.9% |
| 1967 | 1,413 Degree days | +45.4% |
| 1968 | 1,303 Degree days | -7.8% |
| 1969 | 1,421 Degree days | +9.0% |
| 1970 | 1,159 Degree days | -18.4% |
| 1971 | 1,278 Degree days | +10.3% |
| 1972 | 1,391 Degree days | +8.8% |
| 1973 | 1,383 Degree days | -0.5% |
| 1974 | 1,358 Degree days | -1.8% |
| 1975 | 1,300 Degree days | -4.3% |
| 1976 | 1,442 Degree days | +10.9% |
| 1977 | 1,248 Degree days | -13.4% |
| 1978 | 1,246 Degree days | -0.2% |
| 1979 | 1,167 Degree days | -6.3% |
| 1980 | 1,399 Degree days | +19.9% |
| 1981 | 1,286 Degree days | -8.1% |
| 1982 | 1,379 Degree days | +7.2% |
| 1983 | 1,321 Degree days | -4.2% |
| 1984 | 1,313 Degree days | -0.6% |
| 1985 | 1,404 Degree days | +7.0% |
| 1986 | 1,318 Degree days | -6.1% |
| 1987 | 1,495 Degree days | +13.4% |
| 1988 | 1,390 Degree days | -7.0% |
| 1989 | 1,281 Degree days | -7.8% |
| 1990 | 1,226 Degree days | -4.3% |
| 1991 | 1,514 Degree days | +23.5% |
| 1992 | 1,558 Degree days | +2.9% |
| 1993 | 1,500 Degree days | -3.7% |
| 1994 | 1,244 Degree days | -17.1% |
| 1995 | 1,303 Degree days | +4.8% |
| 1996 | 1,445 Degree days | +10.8% |
| 1997 | 1,494 Degree days | +3.4% |
| 1998 | 1,317 Degree days | -11.9% |
| 1999 | 1,108 Degree days | -15.9% |
| 2000 | 1,303 Degree days | +17.6% |
| 2001 | 1,165 Degree days | -10.6% |
| 2002 | 1,284 Degree days | +10.2% |
| 2003 | 1,553 Degree days | +20.9% |
| 2004 | 1,286 Degree days | -17.2% |
| 2005 | 1,320 Degree days | +2.6% |
| 2006 | 1,393 Degree days | +5.5% |
| 2007 | 1,212 Degree days | -13.0% |
| 2008 | 1,176 Degree days | -3.0% |
| 2009 | 1,167 Degree days | -0.8% |
| 2010 | 1,063 Degree days | -8.9% |
| 2011 | 1,491 Degree days | +40.3% |
| 2012 | 1,292 Degree days | -13.4% |
| 2013 | 1,143 Degree days | -11.5% |
| 2014 | 956.82 Degree days | -16.3% |
| 2015 | 1,201 Degree days | +25.6% |
| 2016 | 1,156 Degree days | -3.7% |
| 2017 | 1,260 Degree days | +8.9% |
| 2018 | 1,055 Degree days | -16.2% |
| 2019 | 1,028 Degree days | -2.6% |
| 2020 | 1,029 Degree days | +0.1% |
| 2021 | 1,103 Degree days | +7.1% |
| 2022 | 1,197 Degree days | +8.5% |
| 2023 | 1,052 Degree days | -12.1% |
| 2024 | 1,032 Degree days | -1.9% |
| 2025 | 1,016 Degree days | -1.5% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 1,344 Degree days | 1,076 Degree days | 1,568 Degree days | 10 |
| 1960s | 1,283 Degree days | 971.61 Degree days | 1,445 Degree days | 10 |
| 1970s | 1,297 Degree days | 1,159 Degree days | 1,442 Degree days | 10 |
| 1980s | 1,359 Degree days | 1,281 Degree days | 1,495 Degree days | 10 |
| 1990s | 1,371 Degree days | 1,108 Degree days | 1,558 Degree days | 10 |
| 2000s | 1,286 Degree days | 1,165 Degree days | 1,553 Degree days | 10 |
| 2010s | 1,165 Degree days | 956.82 Degree days | 1,491 Degree days | 10 |
| 2020s | 1,071 Degree days | 1,016 Degree days | 1,197 Degree days | 6 |
More reference data data for Istanbul
- Cooling and heating degree days - Cities and FUAs — Cooling degree 269.54 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling 72.11 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -311.25 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -5.41 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs, annual growth rate -1.55 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -60.99 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree -29.49 % change on previous year (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 3.52 Days per year (2024)
- Precipitation - Cities and FUAs — Change in extreme precipitation -1.11 Days per year (2024)
- Exposure to extreme precipitation — Annual precipitation change 23.87 Millimetres per year (2023)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Istanbul?
- Cooling and heating degree days - cities and fuas in Istanbul was 1,016 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 Istanbul?
- The highest recorded value was 1,568 Degree days in 1953.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Istanbul?
- The lowest recorded value was 956.82 Degree days in 2014.
- How does Istanbul rank for cooling and heating degree days - cities and fuas?
- Istanbul ranks 877th out of 1314 groups with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Istanbul?
- Over the last ten years it is down 15.4%. The long-run trend across the full record is falling.
- Where does this Istanbul 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