Cooling and heating degree days - Cities and FUAs (heating Cities) in Philadelphia (Greater)
Philadelphia (Greater): Cooling and heating degree days - Cities and FUAs (heating Cities) was 1,927 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Philadelphia (Greater), 1950–2025
Source: Organisation for Economic Co-operation and Development. Measured in Degree days.
Analysis
The most recent figure for cooling and heating degree days - cities and fuas in Philadelphia (Greater) is 1,927 Degree days, measured in 2025.
Compared with earlier readings it is up 7.8% on the previous year and down 3.3% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Philadelphia (Greater) peaked at 2,420 Degree days in 1969 and was at its lowest, 1,642 Degree days, in 1990.
Philadelphia (Greater) ranks 432nd 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 (heating Cities) in Philadelphia (Greater), year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 1,985 Degree days | — |
| 1951 | 1,953 Degree days | -1.6% |
| 1952 | 1,976 Degree days | +1.2% |
| 1953 | 1,758 Degree days | -11.1% |
| 1954 | 2,020 Degree days | +14.9% |
| 1955 | 2,130 Degree days | +5.4% |
| 1956 | 2,081 Degree days | -2.3% |
| 1957 | 2,012 Degree days | -3.3% |
| 1958 | 2,380 Degree days | +18.3% |
| 1959 | 2,072 Degree days | -12.9% |
| 1960 | 2,326 Degree days | +12.3% |
| 1961 | 2,277 Degree days | -2.1% |
| 1962 | 2,360 Degree days | +3.6% |
| 1963 | 2,333 Degree days | -1.1% |
| 1964 | 2,163 Degree days | -7.3% |
| 1965 | 2,258 Degree days | +4.4% |
| 1966 | 2,254 Degree days | -0.2% |
| 1967 | 2,296 Degree days | +1.9% |
| 1968 | 2,233 Degree days | -2.7% |
| 1969 | 2,420 Degree days | +8.4% |
| 1970 | 2,283 Degree days | -5.7% |
| 1971 | 2,133 Degree days | -6.6% |
| 1972 | 2,200 Degree days | +3.1% |
| 1973 | 1,843 Degree days | -16.2% |
| 1974 | 1,945 Degree days | +5.5% |
| 1975 | 1,902 Degree days | -2.2% |
| 1976 | 2,188 Degree days | +15.0% |
| 1977 | 2,154 Degree days | -1.6% |
| 1978 | 2,339 Degree days | +8.6% |
| 1979 | 2,085 Degree days | -10.9% |
| 1980 | 2,262 Degree days | +8.5% |
| 1981 | 2,244 Degree days | -0.8% |
| 1982 | 2,127 Degree days | -5.2% |
| 1983 | 2,074 Degree days | -2.5% |
| 1984 | 2,073 Degree days | -0.0% |
| 1985 | 2,012 Degree days | -2.9% |
| 1986 | 2,056 Degree days | +2.2% |
| 1987 | 2,111 Degree days | +2.7% |
| 1988 | 2,200 Degree days | +4.2% |
| 1989 | 2,235 Degree days | +1.6% |
| 1990 | 1,642 Degree days | -26.6% |
| 1991 | 1,777 Degree days | +8.3% |
| 1992 | 2,064 Degree days | +16.1% |
| 1993 | 2,113 Degree days | +2.4% |
| 1994 | 2,087 Degree days | -1.2% |
| 1995 | 2,104 Degree days | +0.8% |
| 1996 | 2,231 Degree days | +6.1% |
| 1997 | 2,052 Degree days | -8.1% |
| 1998 | 1,644 Degree days | -19.8% |
| 1999 | 1,872 Degree days | +13.8% |
| 2000 | 2,131 Degree days | +13.8% |
| 2001 | 1,902 Degree days | -10.7% |
| 2002 | 1,905 Degree days | +0.1% |
| 2003 | 2,229 Degree days | +17.0% |
| 2004 | 2,096 Degree days | -6.0% |
| 2005 | 2,165 Degree days | +3.3% |
| 2006 | 1,697 Degree days | -21.6% |
| 2007 | 2,026 Degree days | +19.4% |
| 2008 | 1,931 Degree days | -4.7% |
| 2009 | 2,031 Degree days | +5.2% |
| 2010 | 2,039 Degree days | +0.4% |
| 2011 | 1,885 Degree days | -7.6% |
| 2012 | 1,658 Degree days | -12.1% |
| 2013 | 2,061 Degree days | +24.3% |
| 2014 | 2,294 Degree days | +11.3% |
| 2015 | 1,994 Degree days | -13.1% |
| 2016 | 1,861 Degree days | -6.6% |
| 2017 | 1,782 Degree days | -4.3% |
| 2018 | 2,032 Degree days | +14.1% |
| 2019 | 1,931 Degree days | -5.0% |
| 2020 | 1,668 Degree days | -13.6% |
| 2021 | 1,787 Degree days | +7.1% |
| 2022 | 1,921 Degree days | +7.5% |
| 2023 | 1,642 Degree days | -14.5% |
| 2024 | 1,788 Degree days | +8.9% |
| 2025 | 1,927 Degree days | +7.8% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 2,037 Degree days | 1,758 Degree days | 2,380 Degree days | 10 |
| 1960s | 2,292 Degree days | 2,163 Degree days | 2,420 Degree days | 10 |
| 1970s | 2,107 Degree days | 1,843 Degree days | 2,339 Degree days | 10 |
| 1980s | 2,139 Degree days | 2,012 Degree days | 2,262 Degree days | 10 |
| 1990s | 1,959 Degree days | 1,642 Degree days | 2,231 Degree days | 10 |
| 2000s | 2,011 Degree days | 1,697 Degree days | 2,229 Degree days | 10 |
| 2010s | 1,954 Degree days | 1,658 Degree days | 2,294 Degree days | 10 |
| 2020s | 1,789 Degree days | 1,642 Degree days | 1,927 Degree days | 6 |
More reference data data for Philadelphia (Greater)
- Cooling and heating degree days - Cities and FUAs — Cooling degree 221.54 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -80.09 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -101.67 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating 57.83 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs, annual growth rate 7.8 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -213.08 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree -40.52 % change on previous year (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 13.67 Days per year (2024)
- Precipitation - Cities and FUAs — Change in extreme precipitation -0.4347 Days per year (2024)
- Dependency ratio - Cities and FUAs 26.6 Percentage of population aged 15-64 years (2024)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Philadelphia (Greater)?
- Cooling and heating degree days - cities and fuas in Philadelphia (Greater) was 1,927 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 Philadelphia (Greater)?
- The highest recorded value was 2,420 Degree days in 1969.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Philadelphia (Greater)?
- The lowest recorded value was 1,642 Degree days in 1990.
- How does Philadelphia (Greater) rank for cooling and heating degree days - cities and fuas?
- Philadelphia (Greater) ranks 432nd out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Philadelphia (Greater)?
- Over the last ten years it is down 3.3%. The long-run trend across the full record is falling.
- Where does this Philadelphia (Greater) 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