Cooling and heating degree days - Cities and FUAs in Jena
Jena: Cooling and heating degree days - Cities and FUAs was 2,194 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Jena, 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 Jena stood at 2,194 Degree days.
Compared with earlier readings it is up 1.7% on the previous year and down 3.7% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Jena peaked at 3,317 Degree days in 1956 and was at its lowest, 2,116 Degree days, in 2014.
Jena ranks 305th of 1314 regions on this measure, in the top quarter.
The long-run direction has been consistently falling across the 76 years of available data.
Cooling and heating degree days - Cities and FUAs in Jena, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 2,786 Degree days | — |
| 1951 | 2,642 Degree days | -5.2% |
| 1952 | 3,030 Degree days | +14.6% |
| 1953 | 2,601 Degree days | -14.2% |
| 1954 | 2,947 Degree days | +13.3% |
| 1955 | 3,132 Degree days | +6.3% |
| 1956 | 3,317 Degree days | +5.9% |
| 1957 | 2,666 Degree days | -19.6% |
| 1958 | 2,781 Degree days | +4.3% |
| 1959 | 2,549 Degree days | -8.3% |
| 1960 | 2,713 Degree days | +6.4% |
| 1961 | 2,487 Degree days | -8.3% |
| 1962 | 3,128 Degree days | +25.8% |
| 1963 | 3,257 Degree days | +4.1% |
| 1964 | 2,968 Degree days | -8.9% |
| 1965 | 3,002 Degree days | +1.2% |
| 1966 | 2,680 Degree days | -10.7% |
| 1967 | 2,516 Degree days | -6.1% |
| 1968 | 2,858 Degree days | +13.6% |
| 1969 | 3,223 Degree days | +12.8% |
| 1970 | 3,027 Degree days | -6.1% |
| 1971 | 2,770 Degree days | -8.5% |
| 1972 | 2,871 Degree days | +3.7% |
| 1973 | 2,893 Degree days | +0.8% |
| 1974 | 2,546 Degree days | -12.0% |
| 1975 | 2,624 Degree days | +3.1% |
| 1976 | 2,833 Degree days | +8.0% |
| 1977 | 2,567 Degree days | -9.4% |
| 1978 | 2,900 Degree days | +13.0% |
| 1979 | 2,992 Degree days | +3.2% |
| 1980 | 3,016 Degree days | +0.8% |
| 1981 | 2,855 Degree days | -5.3% |
| 1982 | 2,583 Degree days | -9.6% |
| 1983 | 2,593 Degree days | +0.4% |
| 1984 | 2,845 Degree days | +9.7% |
| 1985 | 3,084 Degree days | +8.4% |
| 1986 | 2,909 Degree days | -5.7% |
| 1987 | 3,138 Degree days | +7.9% |
| 1988 | 2,484 Degree days | -20.9% |
| 1989 | 2,330 Degree days | -6.2% |
| 1990 | 2,298 Degree days | -1.4% |
| 1991 | 2,756 Degree days | +19.9% |
| 1992 | 2,549 Degree days | -7.5% |
| 1993 | 2,726 Degree days | +6.9% |
| 1994 | 2,381 Degree days | -12.6% |
| 1995 | 2,671 Degree days | +12.2% |
| 1996 | 3,223 Degree days | +20.6% |
| 1997 | 2,735 Degree days | -15.1% |
| 1998 | 2,544 Degree days | -7.0% |
| 1999 | 2,417 Degree days | -5.0% |
| 2000 | 2,252 Degree days | -6.8% |
| 2001 | 2,608 Degree days | +15.8% |
| 2002 | 2,490 Degree days | -4.5% |
| 2003 | 2,656 Degree days | +6.7% |
| 2004 | 2,632 Degree days | -0.9% |
| 2005 | 2,615 Degree days | -0.7% |
| 2006 | 2,503 Degree days | -4.3% |
| 2007 | 2,268 Degree days | -9.4% |
| 2008 | 2,434 Degree days | +7.3% |
| 2009 | 2,532 Degree days | +4.0% |
| 2010 | 3,152 Degree days | +24.5% |
| 2011 | 2,383 Degree days | -24.4% |
| 2012 | 2,564 Degree days | +7.6% |
| 2013 | 2,778 Degree days | +8.4% |
| 2014 | 2,116 Degree days | -23.8% |
| 2015 | 2,279 Degree days | +7.7% |
| 2016 | 2,464 Degree days | +8.1% |
| 2017 | 2,375 Degree days | -3.6% |
| 2018 | 2,269 Degree days | -4.5% |
| 2019 | 2,216 Degree days | -2.3% |
| 2020 | 2,139 Degree days | -3.5% |
| 2021 | 2,593 Degree days | +21.3% |
| 2022 | 2,219 Degree days | -14.4% |
| 2023 | 2,234 Degree days | +0.7% |
| 2024 | 2,157 Degree days | -3.4% |
| 2025 | 2,194 Degree days | +1.7% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 2,845 Degree days | 2,549 Degree days | 3,317 Degree days | 10 |
| 1960s | 2,883 Degree days | 2,487 Degree days | 3,257 Degree days | 10 |
| 1970s | 2,802 Degree days | 2,546 Degree days | 3,027 Degree days | 10 |
| 1980s | 2,784 Degree days | 2,330 Degree days | 3,138 Degree days | 10 |
| 1990s | 2,630 Degree days | 2,298 Degree days | 3,223 Degree days | 10 |
| 2000s | 2,499 Degree days | 2,252 Degree days | 2,656 Degree days | 10 |
| 2010s | 2,460 Degree days | 2,116 Degree days | 3,152 Degree days | 10 |
| 2020s | 2,256 Degree days | 2,139 Degree days | 2,593 Degree days | 6 |
More reference data data for Jena
- Cooling and heating degree days - Cities and FUAs — Cooling degree 21.98 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -22.22 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -447.78 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating 7.59 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs, annual growth rate 1.71 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -161.64 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree -72.61 % change on previous year (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 1.67 Days per year (2024)
- Precipitation - Cities and FUAs — Change in extreme precipitation -0.384 Days per year (2024)
- Dependency ratio - Cities and FUAs 35.4 Percentage of population aged 15-64 years (2025)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Jena?
- Cooling and heating degree days - cities and fuas in Jena was 2,194 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 Jena?
- The highest recorded value was 3,317 Degree days in 1956.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Jena?
- The lowest recorded value was 2,116 Degree days in 2014.
- How does Jena rank for cooling and heating degree days - cities and fuas?
- Jena ranks 305th out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Jena?
- Over the last ten years it is down 3.7%. The long-run trend across the full record is falling.
- Where does this Jena 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