Cooling and heating degree days - Cities and FUAs (heating Cities) in Roma
Roma: Cooling and heating degree days - Cities and FUAs (heating Cities) was 703.45 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Roma, 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 Roma stood at 703.45 Degree days. That is the lowest value across all 76 years on record.
The figure is down 16.1% on the previous year and down 28.8% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Roma peaked at 1,495 Degree days in 1956 and was at its lowest, 703.45 Degree days, in 2025.
Roma ranks 989th of 1314 regions on this measure, in the bottom quarter.
The long-run direction has been consistently falling across the 76 years of available data.
Cooling and heating degree days - Cities and FUAs (heating Cities) in Roma, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 1,114 Degree days | — |
| 1951 | 1,045 Degree days | -6.2% |
| 1952 | 1,158 Degree days | +10.9% |
| 1953 | 1,194 Degree days | +3.1% |
| 1954 | 1,235 Degree days | +3.5% |
| 1955 | 966.34 Degree days | -21.8% |
| 1956 | 1,495 Degree days | +54.7% |
| 1957 | 1,107 Degree days | -25.9% |
| 1958 | 1,095 Degree days | -1.1% |
| 1959 | 1,045 Degree days | -4.6% |
| 1960 | 1,021 Degree days | -2.3% |
| 1961 | 1,010 Degree days | -1.0% |
| 1962 | 1,232 Degree days | +22.0% |
| 1963 | 1,178 Degree days | -4.4% |
| 1964 | 1,141 Degree days | -3.2% |
| 1965 | 1,195 Degree days | +4.8% |
| 1966 | 1,140 Degree days | -4.6% |
| 1967 | 1,125 Degree days | -1.3% |
| 1968 | 1,124 Degree days | -0.1% |
| 1969 | 1,260 Degree days | +12.1% |
| 1970 | 1,129 Degree days | -10.4% |
| 1971 | 1,257 Degree days | +11.3% |
| 1972 | 1,055 Degree days | -16.1% |
| 1973 | 1,265 Degree days | +19.9% |
| 1974 | 1,189 Degree days | -6.0% |
| 1975 | 1,176 Degree days | -1.1% |
| 1976 | 1,171 Degree days | -0.4% |
| 1977 | 1,006 Degree days | -14.1% |
| 1978 | 1,175 Degree days | +16.8% |
| 1979 | 1,118 Degree days | -4.8% |
| 1980 | 1,281 Degree days | +14.6% |
| 1981 | 1,283 Degree days | +0.2% |
| 1982 | 1,079 Degree days | -15.9% |
| 1983 | 1,165 Degree days | +8.0% |
| 1984 | 1,168 Degree days | +0.2% |
| 1985 | 1,162 Degree days | -0.5% |
| 1986 | 1,140 Degree days | -1.8% |
| 1987 | 1,162 Degree days | +1.9% |
| 1988 | 1,093 Degree days | -5.9% |
| 1989 | 1,071 Degree days | -2.0% |
| 1990 | 1,052 Degree days | -1.8% |
| 1991 | 1,263 Degree days | +20.0% |
| 1992 | 1,050 Degree days | -16.8% |
| 1993 | 1,183 Degree days | +12.7% |
| 1994 | 941.54 Degree days | -20.4% |
| 1995 | 1,129 Degree days | +19.9% |
| 1996 | 1,114 Degree days | -1.3% |
| 1997 | 989.41 Degree days | -11.2% |
| 1998 | 1,144 Degree days | +15.7% |
| 1999 | 1,145 Degree days | +0.1% |
| 2000 | 984.65 Degree days | -14.0% |
| 2001 | 985.22 Degree days | +0.1% |
| 2002 | 937.59 Degree days | -4.8% |
| 2003 | 1,105 Degree days | +17.8% |
| 2004 | 1,048 Degree days | -5.1% |
| 2005 | 1,274 Degree days | +21.6% |
| 2006 | 1,101 Degree days | -13.6% |
| 2007 | 984.78 Degree days | -10.5% |
| 2008 | 1,008 Degree days | +2.3% |
| 2009 | 1,035 Degree days | +2.7% |
| 2010 | 1,104 Degree days | +6.7% |
| 2011 | 1,071 Degree days | -2.9% |
| 2012 | 1,110 Degree days | +3.7% |
| 2013 | 1,057 Degree days | -4.8% |
| 2014 | 818.76 Degree days | -22.5% |
| 2015 | 988.43 Degree days | +20.7% |
| 2016 | 873.62 Degree days | -11.6% |
| 2017 | 1,023 Degree days | +17.1% |
| 2018 | 907.55 Degree days | -11.3% |
| 2019 | 923.25 Degree days | +1.7% |
| 2020 | 894 Degree days | -3.2% |
| 2021 | 958.61 Degree days | +7.2% |
| 2022 | 893.13 Degree days | -6.8% |
| 2023 | 920.18 Degree days | +3.0% |
| 2024 | 838.13 Degree days | -8.9% |
| 2025 | 703.45 Degree days | -16.1% |
Biggest year-on-year movements
Years where Cooling and heating degree days - Cities and FUAs (heating Cities) in Roma changed far more than this series normally does. A large move can be a real event or a change in how the figure was measured — the source note below says who published it.
| Year | Change | From | To |
|---|---|---|---|
| 1956 | +54.7% | 966.34 Degree days | 1,495 Degree days |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 1,146 Degree days | 966.34 Degree days | 1,495 Degree days | 10 |
| 1960s | 1,143 Degree days | 1,010 Degree days | 1,260 Degree days | 10 |
| 1970s | 1,154 Degree days | 1,006 Degree days | 1,265 Degree days | 10 |
| 1980s | 1,161 Degree days | 1,071 Degree days | 1,283 Degree days | 10 |
| 1990s | 1,101 Degree days | 941.54 Degree days | 1,263 Degree days | 10 |
| 2000s | 1,046 Degree days | 937.59 Degree days | 1,274 Degree days | 10 |
| 2010s | 987.68 Degree days | 818.76 Degree days | 1,110 Degree days | 10 |
| 2020s | 867.92 Degree days | 703.45 Degree days | 958.61 Degree days | 6 |
More reference data data for Roma
- Cooling and heating degree days by NUTS 2 regions - annual data -1.42 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree 336.49 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling 81.54 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -393.24 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -52.09 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree -26.35 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs, annual growth rate -16.07 % change on previous year (2025)
- Cooling and heating degree days by NUTS 2 regions - monthly data -13.53 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -59.62 % change on previous year (2025)
- Precipitation - Cities and FUAs — Change in extreme precipitation -0.3072 Days per year (2024)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Roma?
- Cooling and heating degree days - cities and fuas in Roma was 703.45 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 Roma?
- The highest recorded value was 1,495 Degree days in 1956.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Roma?
- The lowest recorded value was 703.45 Degree days in 2025.
- How does Roma rank for cooling and heating degree days - cities and fuas?
- Roma ranks 989th out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Roma?
- Over the last ten years it is down 28.8%. The long-run trend across the full record is falling.
- Where does this Roma 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