Cooling and heating degree days - Cities and FUAs in Stara Zagora
Stara Zagora: Cooling and heating degree days - Cities and FUAs was 1,531 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Stara Zagora, 1950–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degree days.
Analysis
Stara Zagora recorded 1,531 Degree days for cooling and heating degree days - cities and fuas in 2025. That is the lowest value across all 76 years on record.
The figure is down 9.4% on the previous year and down 16.3% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Stara Zagora peaked at 2,591 Degree days in 1954 and was at its lowest, 1,531 Degree days, in 2025.
Stara Zagora ranks 672nd 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 Stara Zagora, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 2,075 Degree days | — |
| 1951 | 1,956 Degree days | -5.7% |
| 1952 | 2,059 Degree days | +5.3% |
| 1953 | 2,343 Degree days | +13.8% |
| 1954 | 2,591 Degree days | +10.6% |
| 1955 | 2,005 Degree days | -22.6% |
| 1956 | 2,478 Degree days | +23.6% |
| 1957 | 2,136 Degree days | -13.8% |
| 1958 | 1,924 Degree days | -9.9% |
| 1959 | 2,214 Degree days | +15.1% |
| 1960 | 1,850 Degree days | -16.4% |
| 1961 | 1,976 Degree days | +6.8% |
| 1962 | 2,112 Degree days | +6.9% |
| 1963 | 2,243 Degree days | +6.2% |
| 1964 | 2,182 Degree days | -2.7% |
| 1965 | 2,164 Degree days | -0.9% |
| 1966 | 1,815 Degree days | -16.1% |
| 1967 | 2,150 Degree days | +18.4% |
| 1968 | 2,083 Degree days | -3.1% |
| 1969 | 2,396 Degree days | +15.0% |
| 1970 | 1,973 Degree days | -17.6% |
| 1971 | 2,134 Degree days | +8.1% |
| 1972 | 2,127 Degree days | -0.3% |
| 1973 | 2,351 Degree days | +10.6% |
| 1974 | 2,137 Degree days | -9.1% |
| 1975 | 2,134 Degree days | -0.1% |
| 1976 | 2,217 Degree days | +3.9% |
| 1977 | 1,998 Degree days | -9.9% |
| 1978 | 2,235 Degree days | +11.8% |
| 1979 | 2,065 Degree days | -7.6% |
| 1980 | 2,276 Degree days | +10.2% |
| 1981 | 2,185 Degree days | -4.0% |
| 1982 | 2,160 Degree days | -1.1% |
| 1983 | 2,128 Degree days | -1.5% |
| 1984 | 2,160 Degree days | +1.5% |
| 1985 | 2,247 Degree days | +4.0% |
| 1986 | 2,231 Degree days | -0.7% |
| 1987 | 2,294 Degree days | +2.8% |
| 1988 | 2,258 Degree days | -1.6% |
| 1989 | 1,940 Degree days | -14.1% |
| 1990 | 1,884 Degree days | -2.9% |
| 1991 | 2,253 Degree days | +19.6% |
| 1992 | 2,118 Degree days | -6.0% |
| 1993 | 2,238 Degree days | +5.7% |
| 1994 | 1,886 Degree days | -15.7% |
| 1995 | 2,197 Degree days | +16.5% |
| 1996 | 2,313 Degree days | +5.3% |
| 1997 | 2,259 Degree days | -2.3% |
| 1998 | 2,114 Degree days | -6.4% |
| 1999 | 1,928 Degree days | -8.8% |
| 2000 | 1,997 Degree days | +3.6% |
| 2001 | 2,050 Degree days | +2.7% |
| 2002 | 2,002 Degree days | -2.4% |
| 2003 | 2,297 Degree days | +14.7% |
| 2004 | 2,005 Degree days | -12.7% |
| 2005 | 2,095 Degree days | +4.5% |
| 2006 | 2,091 Degree days | -0.2% |
| 2007 | 1,882 Degree days | -10.0% |
| 2008 | 1,924 Degree days | +2.2% |
| 2009 | 1,908 Degree days | -0.8% |
| 2010 | 1,934 Degree days | +1.3% |
| 2011 | 2,223 Degree days | +15.0% |
| 2012 | 2,114 Degree days | -4.9% |
| 2013 | 1,815 Degree days | -14.1% |
| 2014 | 1,718 Degree days | -5.3% |
| 2015 | 1,828 Degree days | +6.4% |
| 2016 | 1,872 Degree days | +2.4% |
| 2017 | 1,979 Degree days | +5.8% |
| 2018 | 1,861 Degree days | -6.0% |
| 2019 | 1,576 Degree days | -15.3% |
| 2020 | 1,744 Degree days | +10.7% |
| 2021 | 1,885 Degree days | +8.1% |
| 2022 | 1,827 Degree days | -3.1% |
| 2023 | 1,690 Degree days | -7.5% |
| 2024 | 1,691 Degree days | +0.0% |
| 2025 | 1,531 Degree days | -9.4% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 2,178 Degree days | 1,924 Degree days | 2,591 Degree days | 10 |
| 1960s | 2,097 Degree days | 1,815 Degree days | 2,396 Degree days | 10 |
| 1970s | 2,137 Degree days | 1,973 Degree days | 2,351 Degree days | 10 |
| 1980s | 2,188 Degree days | 1,940 Degree days | 2,294 Degree days | 10 |
| 1990s | 2,119 Degree days | 1,884 Degree days | 2,313 Degree days | 10 |
| 2000s | 2,025 Degree days | 1,882 Degree days | 2,297 Degree days | 10 |
| 2010s | 1,892 Degree days | 1,576 Degree days | 2,223 Degree days | 10 |
| 2020s | 1,728 Degree days | 1,531 Degree days | 1,885 Degree days | 6 |
More reference data data for Stara Zagora
- Cooling and heating degree days by NUTS 2 regions - annual data 6.18 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree 292.14 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling 101.76 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -568.07 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -38.98 % change on previous year (2025)
- Cooling and heating degree days by NUTS 2 regions - monthly data -2.95 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs, annual growth rate -9.43 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -61.46 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree -35.71 % change on previous year (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 4.29 Days per year (2024)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Stara Zagora?
- Cooling and heating degree days - cities and fuas in Stara Zagora was 1,531 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 Stara Zagora?
- The highest recorded value was 2,591 Degree days in 1954.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Stara Zagora?
- The lowest recorded value was 1,531 Degree days in 2025.
- How does Stara Zagora rank for cooling and heating degree days - cities and fuas?
- Stara Zagora ranks 672nd out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Stara Zagora?
- Over the last ten years it is down 16.3%. The long-run trend across the full record is falling.
- Where does this Stara Zagora 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