Cooling and heating degree days - Cities and FUAs in Delaware
Delaware: Cooling and heating degree days - Cities and FUAs was 2,354 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Delaware, 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 Delaware stood at 2,354 Degree days.
That represents a change of up 15.1% on the previous year and down 1.9% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Delaware peaked at 3,056 Degree days in 1978 and was at its lowest, 1,994 Degree days, in 1998.
Delaware ranks 222nd of 1314 groups 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 Delaware, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 2,671 Degree days | — |
| 1951 | 2,643 Degree days | -1.1% |
| 1952 | 2,358 Degree days | -10.8% |
| 1953 | 2,208 Degree days | -6.3% |
| 1954 | 2,428 Degree days | +10.0% |
| 1955 | 2,468 Degree days | +1.6% |
| 1956 | 2,486 Degree days | +0.8% |
| 1957 | 2,517 Degree days | +1.3% |
| 1958 | 2,860 Degree days | +13.6% |
| 1959 | 2,512 Degree days | -12.2% |
| 1960 | 2,871 Degree days | +14.3% |
| 1961 | 2,670 Degree days | -7.0% |
| 1962 | 2,848 Degree days | +6.7% |
| 1963 | 2,966 Degree days | +4.2% |
| 1964 | 2,514 Degree days | -15.2% |
| 1965 | 2,517 Degree days | +0.1% |
| 1966 | 2,760 Degree days | +9.6% |
| 1967 | 2,645 Degree days | -4.1% |
| 1968 | 2,679 Degree days | +1.3% |
| 1969 | 2,934 Degree days | +9.5% |
| 1970 | 2,729 Degree days | -7.0% |
| 1971 | 2,528 Degree days | -7.4% |
| 1972 | 2,809 Degree days | +11.1% |
| 1973 | 2,254 Degree days | -19.8% |
| 1974 | 2,469 Degree days | +9.6% |
| 1975 | 2,443 Degree days | -1.1% |
| 1976 | 2,699 Degree days | +10.5% |
| 1977 | 2,806 Degree days | +4.0% |
| 1978 | 3,056 Degree days | +8.9% |
| 1979 | 2,819 Degree days | -7.7% |
| 1980 | 2,816 Degree days | -0.1% |
| 1981 | 2,634 Degree days | -6.5% |
| 1982 | 2,642 Degree days | +0.3% |
| 1983 | 2,523 Degree days | -4.5% |
| 1984 | 2,629 Degree days | +4.2% |
| 1985 | 2,641 Degree days | +0.5% |
| 1986 | 2,422 Degree days | -8.3% |
| 1987 | 2,342 Degree days | -3.3% |
| 1988 | 2,702 Degree days | +15.4% |
| 1989 | 2,760 Degree days | +2.1% |
| 1990 | 2,086 Degree days | -24.4% |
| 1991 | 2,240 Degree days | +7.4% |
| 1992 | 2,422 Degree days | +8.1% |
| 1993 | 2,596 Degree days | +7.2% |
| 1994 | 2,451 Degree days | -5.6% |
| 1995 | 2,604 Degree days | +6.3% |
| 1996 | 2,755 Degree days | +5.8% |
| 1997 | 2,620 Degree days | -4.9% |
| 1998 | 1,994 Degree days | -23.9% |
| 1999 | 2,296 Degree days | +15.2% |
| 2000 | 2,577 Degree days | +12.3% |
| 2001 | 2,261 Degree days | -12.3% |
| 2002 | 2,418 Degree days | +7.0% |
| 2003 | 2,610 Degree days | +7.9% |
| 2004 | 2,414 Degree days | -7.5% |
| 2005 | 2,535 Degree days | +5.0% |
| 2006 | 2,156 Degree days | -15.0% |
| 2007 | 2,440 Degree days | +13.2% |
| 2008 | 2,582 Degree days | +5.8% |
| 2009 | 2,474 Degree days | -4.2% |
| 2010 | 2,547 Degree days | +2.9% |
| 2011 | 2,353 Degree days | -7.6% |
| 2012 | 2,043 Degree days | -13.2% |
| 2013 | 2,631 Degree days | +28.8% |
| 2014 | 2,993 Degree days | +13.8% |
| 2015 | 2,400 Degree days | -19.8% |
| 2016 | 2,202 Degree days | -8.2% |
| 2017 | 2,104 Degree days | -4.5% |
| 2018 | 2,553 Degree days | +21.4% |
| 2019 | 2,414 Degree days | -5.5% |
| 2020 | 2,183 Degree days | -9.5% |
| 2021 | 2,250 Degree days | +3.1% |
| 2022 | 2,399 Degree days | +6.6% |
| 2023 | 2,082 Degree days | -13.2% |
| 2024 | 2,046 Degree days | -1.7% |
| 2025 | 2,354 Degree days | +15.1% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 2,515 Degree days | 2,208 Degree days | 2,860 Degree days | 10 |
| 1960s | 2,741 Degree days | 2,514 Degree days | 2,966 Degree days | 10 |
| 1970s | 2,661 Degree days | 2,254 Degree days | 3,056 Degree days | 10 |
| 1980s | 2,611 Degree days | 2,342 Degree days | 2,816 Degree days | 10 |
| 1990s | 2,406 Degree days | 1,994 Degree days | 2,755 Degree days | 10 |
| 2000s | 2,447 Degree days | 2,156 Degree days | 2,610 Degree days | 10 |
| 2010s | 2,424 Degree days | 2,043 Degree days | 2,993 Degree days | 10 |
| 2020s | 2,219 Degree days | 2,046 Degree days | 2,399 Degree days | 6 |
More reference data data for Delaware
- Cooling and heating degree days - Cities and FUAs — Change in cooling -43.17 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree -27.84 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -236.12 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs, annual growth rate 15.08 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating 71.22 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -124.7 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree 194.08 Degree days (2025)
- Precipitation - Cities and FUAs — Change in extreme precipitation -0.554 Days per year (2024)
- Precipitation - Cities and FUAs — Extreme precipitation days 9.9 Days per year (2024)
- Exposure to extreme precipitation — Annual precipitation change 19.09 Millimetres per year (2023)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Delaware?
- Cooling and heating degree days - cities and fuas in Delaware was 2,354 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 Delaware?
- The highest recorded value was 3,056 Degree days in 1978.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Delaware?
- The lowest recorded value was 1,994 Degree days in 1998.
- How does Delaware rank for cooling and heating degree days - cities and fuas?
- Delaware ranks 222nd out of 1314 groups with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Delaware?
- Over the last ten years it is down 1.9%. The long-run trend across the full record is falling.
- Where does this Delaware 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