Cooling and heating degree days - Cities and FUAs in Bologna
Bologna: Cooling and heating degree days - Cities and FUAs was 1,234 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Bologna, 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 Bologna stood at 1,234 Degree days.
That represents a change of down 9.4% on the previous year and down 12.6% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Bologna peaked at 2,130 Degree days in 1956 and was at its lowest, 1,134 Degree days, in 2014.
That places Bologna 805th out of 1314 regions 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 Bologna, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 1,666 Degree days | — |
| 1951 | 1,576 Degree days | -5.4% |
| 1952 | 1,860 Degree days | +18.0% |
| 1953 | 1,863 Degree days | +0.2% |
| 1954 | 1,902 Degree days | +2.1% |
| 1955 | 1,648 Degree days | -13.4% |
| 1956 | 2,130 Degree days | +29.3% |
| 1957 | 1,687 Degree days | -20.8% |
| 1958 | 1,672 Degree days | -0.9% |
| 1959 | 1,556 Degree days | -6.9% |
| 1960 | 1,658 Degree days | +6.5% |
| 1961 | 1,557 Degree days | -6.1% |
| 1962 | 1,915 Degree days | +23.0% |
| 1963 | 2,049 Degree days | +7.0% |
| 1964 | 1,821 Degree days | -11.1% |
| 1965 | 1,864 Degree days | +2.3% |
| 1966 | 1,737 Degree days | -6.8% |
| 1967 | 1,716 Degree days | -1.2% |
| 1968 | 1,687 Degree days | -1.7% |
| 1969 | 1,973 Degree days | +16.9% |
| 1970 | 1,756 Degree days | -11.0% |
| 1971 | 1,782 Degree days | +1.5% |
| 1972 | 1,627 Degree days | -8.7% |
| 1973 | 1,811 Degree days | +11.3% |
| 1974 | 1,596 Degree days | -11.8% |
| 1975 | 1,624 Degree days | +1.7% |
| 1976 | 1,796 Degree days | +10.6% |
| 1977 | 1,566 Degree days | -12.8% |
| 1978 | 1,845 Degree days | +17.8% |
| 1979 | 1,774 Degree days | -3.9% |
| 1980 | 1,993 Degree days | +12.3% |
| 1981 | 1,772 Degree days | -11.1% |
| 1982 | 1,656 Degree days | -6.5% |
| 1983 | 1,684 Degree days | +1.7% |
| 1984 | 1,784 Degree days | +6.0% |
| 1985 | 1,837 Degree days | +2.9% |
| 1986 | 1,792 Degree days | -2.4% |
| 1987 | 1,775 Degree days | -1.0% |
| 1988 | 1,574 Degree days | -11.3% |
| 1989 | 1,561 Degree days | -0.8% |
| 1990 | 1,508 Degree days | -3.4% |
| 1991 | 1,892 Degree days | +25.4% |
| 1992 | 1,526 Degree days | -19.3% |
| 1993 | 1,654 Degree days | +8.4% |
| 1994 | 1,381 Degree days | -16.5% |
| 1995 | 1,613 Degree days | +16.8% |
| 1996 | 1,672 Degree days | +3.6% |
| 1997 | 1,474 Degree days | -11.8% |
| 1998 | 1,599 Degree days | +8.5% |
| 1999 | 1,609 Degree days | +0.6% |
| 2000 | 1,373 Degree days | -14.7% |
| 2001 | 1,560 Degree days | +13.7% |
| 2002 | 1,388 Degree days | -11.0% |
| 2003 | 1,697 Degree days | +22.2% |
| 2004 | 1,635 Degree days | -3.7% |
| 2005 | 1,789 Degree days | +9.5% |
| 2006 | 1,547 Degree days | -13.5% |
| 2007 | 1,369 Degree days | -11.5% |
| 2008 | 1,414 Degree days | +3.3% |
| 2009 | 1,556 Degree days | +10.0% |
| 2010 | 1,778 Degree days | +14.3% |
| 2011 | 1,586 Degree days | -10.8% |
| 2012 | 1,639 Degree days | +3.3% |
| 2013 | 1,603 Degree days | -2.2% |
| 2014 | 1,134 Degree days | -29.3% |
| 2015 | 1,411 Degree days | +24.4% |
| 2016 | 1,359 Degree days | -3.7% |
| 2017 | 1,460 Degree days | +7.4% |
| 2018 | 1,443 Degree days | -1.2% |
| 2019 | 1,341 Degree days | -7.1% |
| 2020 | 1,321 Degree days | -1.5% |
| 2021 | 1,500 Degree days | +13.6% |
| 2022 | 1,331 Degree days | -11.3% |
| 2023 | 1,343 Degree days | +0.9% |
| 2024 | 1,362 Degree days | +1.4% |
| 2025 | 1,234 Degree days | -9.4% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 1,756 Degree days | 1,556 Degree days | 2,130 Degree days | 10 |
| 1960s | 1,798 Degree days | 1,557 Degree days | 2,049 Degree days | 10 |
| 1970s | 1,718 Degree days | 1,566 Degree days | 1,845 Degree days | 10 |
| 1980s | 1,743 Degree days | 1,561 Degree days | 1,993 Degree days | 10 |
| 1990s | 1,593 Degree days | 1,381 Degree days | 1,892 Degree days | 10 |
| 2000s | 1,533 Degree days | 1,369 Degree days | 1,789 Degree days | 10 |
| 2010s | 1,475 Degree days | 1,134 Degree days | 1,778 Degree days | 10 |
| 2020s | 1,349 Degree days | 1,234 Degree days | 1,500 Degree days | 6 |
More reference data data for Bologna
- Cooling and heating degree days by NUTS 2 regions - annual data 4.09 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree 319.26 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling 14.5 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -382.02 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -50.61 % change on previous year (2025)
- Cooling and heating degree days by NUTS 2 regions - monthly data -13.95 % 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 -86.81 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree -23.01 % change on previous year (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 13.88 Days per year (2024)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Bologna?
- Cooling and heating degree days - cities and fuas in Bologna was 1,234 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 Bologna?
- The highest recorded value was 2,130 Degree days in 1956.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Bologna?
- The lowest recorded value was 1,134 Degree days in 2014.
- How does Bologna rank for cooling and heating degree days - cities and fuas?
- Bologna ranks 805th out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Bologna?
- Over the last ten years it is down 12.6%. The long-run trend across the full record is falling.
- Where does this Bologna 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