Cooling and heating degree days - Cities and FUAs in Siirt
Siirt: Cooling and heating degree days - Cities and FUAs was 1,400 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Siirt, 1950–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degree days.
Analysis
Siirt recorded 1,400 Degree days for cooling and heating degree days - cities and fuas in 2025.
The figure is down 14.8% on the previous year and down 19.3% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Siirt peaked at 2,640 Degree days in 1992 and was at its lowest, 1,340 Degree days, in 2018.
Siirt ranks 727th 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 in Siirt, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 2,203 Degree days | — |
| 1951 | 1,897 Degree days | -13.9% |
| 1952 | 1,939 Degree days | +2.2% |
| 1953 | 2,273 Degree days | +17.2% |
| 1954 | 1,914 Degree days | -15.8% |
| 1955 | 1,623 Degree days | -15.2% |
| 1956 | 2,249 Degree days | +38.6% |
| 1957 | 2,121 Degree days | -5.7% |
| 1958 | 1,937 Degree days | -8.7% |
| 1959 | 2,048 Degree days | +5.7% |
| 1960 | 1,725 Degree days | -15.7% |
| 1961 | 1,933 Degree days | +12.1% |
| 1962 | 1,713 Degree days | -11.4% |
| 1963 | 1,820 Degree days | +6.2% |
| 1964 | 2,309 Degree days | +26.9% |
| 1965 | 2,105 Degree days | -8.8% |
| 1966 | 1,505 Degree days | -28.5% |
| 1967 | 2,185 Degree days | +45.2% |
| 1968 | 1,938 Degree days | -11.3% |
| 1969 | 2,012 Degree days | +3.8% |
| 1970 | 1,768 Degree days | -12.1% |
| 1971 | 2,043 Degree days | +15.6% |
| 1972 | 2,358 Degree days | +15.4% |
| 1973 | 2,258 Degree days | -4.2% |
| 1974 | 2,030 Degree days | -10.1% |
| 1975 | 2,120 Degree days | +4.5% |
| 1976 | 2,139 Degree days | +0.9% |
| 1977 | 2,129 Degree days | -0.5% |
| 1978 | 1,849 Degree days | -13.2% |
| 1979 | 1,709 Degree days | -7.5% |
| 1980 | 2,074 Degree days | +21.3% |
| 1981 | 1,907 Degree days | -8.0% |
| 1982 | 2,378 Degree days | +24.7% |
| 1983 | 2,219 Degree days | -6.7% |
| 1984 | 1,996 Degree days | -10.1% |
| 1985 | 2,143 Degree days | +7.3% |
| 1986 | 1,933 Degree days | -9.8% |
| 1987 | 1,999 Degree days | +3.4% |
| 1988 | 2,076 Degree days | +3.9% |
| 1989 | 2,042 Degree days | -1.6% |
| 1990 | 1,991 Degree days | -2.5% |
| 1991 | 2,013 Degree days | +1.1% |
| 1992 | 2,640 Degree days | +31.2% |
| 1993 | 2,211 Degree days | -16.3% |
| 1994 | 1,929 Degree days | -12.7% |
| 1995 | 1,998 Degree days | +3.5% |
| 1996 | 1,846 Degree days | -7.6% |
| 1997 | 2,138 Degree days | +15.8% |
| 1998 | 1,837 Degree days | -14.1% |
| 1999 | 1,695 Degree days | -7.8% |
| 2000 | 1,941 Degree days | +14.5% |
| 2001 | 1,689 Degree days | -13.0% |
| 2002 | 1,846 Degree days | +9.3% |
| 2003 | 1,854 Degree days | +0.4% |
| 2004 | 1,878 Degree days | +1.3% |
| 2005 | 1,811 Degree days | -3.6% |
| 2006 | 1,889 Degree days | +4.3% |
| 2007 | 1,945 Degree days | +2.9% |
| 2008 | 1,856 Degree days | -4.5% |
| 2009 | 1,796 Degree days | -3.3% |
| 2010 | 1,389 Degree days | -22.6% |
| 2011 | 1,955 Degree days | +40.7% |
| 2012 | 1,840 Degree days | -5.8% |
| 2013 | 1,808 Degree days | -1.7% |
| 2014 | 1,594 Degree days | -11.9% |
| 2015 | 1,735 Degree days | +8.8% |
| 2016 | 1,760 Degree days | +1.5% |
| 2017 | 1,789 Degree days | +1.6% |
| 2018 | 1,340 Degree days | -25.1% |
| 2019 | 1,657 Degree days | +23.7% |
| 2020 | 1,658 Degree days | +0.1% |
| 2021 | 1,513 Degree days | -8.8% |
| 2022 | 1,658 Degree days | +9.6% |
| 2023 | 1,559 Degree days | -6.0% |
| 2024 | 1,642 Degree days | +5.3% |
| 2025 | 1,400 Degree days | -14.8% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 2,020 Degree days | 1,623 Degree days | 2,273 Degree days | 10 |
| 1960s | 1,925 Degree days | 1,505 Degree days | 2,309 Degree days | 10 |
| 1970s | 2,040 Degree days | 1,709 Degree days | 2,358 Degree days | 10 |
| 1980s | 2,077 Degree days | 1,907 Degree days | 2,378 Degree days | 10 |
| 1990s | 2,030 Degree days | 1,695 Degree days | 2,640 Degree days | 10 |
| 2000s | 1,851 Degree days | 1,689 Degree days | 1,945 Degree days | 10 |
| 2010s | 1,687 Degree days | 1,340 Degree days | 1,955 Degree days | 10 |
| 2020s | 1,572 Degree days | 1,400 Degree days | 1,658 Degree days | 6 |
More reference data data for Siirt
- Cooling and heating degree days - Cities and FUAs — Cooling degree 1.22 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling 4.1 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs, annual growth rate -14.77 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -75.56 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -563.35 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling 253.62 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree 832.03 Degree days (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 11 Days per year (2024)
- Precipitation - Cities and FUAs — Change in extreme precipitation 3.06 Days per year (2024)
- Dependency ratio - Cities and FUAs 7.4 Percentage of population aged 15-64 years (2024)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Siirt?
- Cooling and heating degree days - cities and fuas in Siirt was 1,400 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 Siirt?
- The highest recorded value was 2,640 Degree days in 1992.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Siirt?
- The lowest recorded value was 1,340 Degree days in 2018.
- How does Siirt rank for cooling and heating degree days - cities and fuas?
- Siirt ranks 727th out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Siirt?
- Over the last ten years it is down 19.3%. The long-run trend across the full record is falling.
- Where does this Siirt 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