Cooling and heating degree days - Cities and FUAs in Seattle
Seattle: Cooling and heating degree days - Cities and FUAs was 2,768 Degree days in 2025. ▼ Falling
Cooling and heating degree days - Cities and FUAs in Seattle, 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 Seattle is 2,768 Degree days, measured in 2025.
That represents a change of down 10.8% on the previous year and up 6.5% over ten years.
Over the whole period, cooling and heating degree days - cities and fuas in Seattle peaked at 3,864 Degree days in 1955 and was at its lowest, 2,600 Degree days, in 2015.
That places Seattle 110th out of 1314 regions with data for 2025, putting it in the top 10%.
The long-run direction has been consistently falling across the 76 years of available data.
Cooling and heating degree days - Cities and FUAs in Seattle, year by year
| Year | Degree days | Change |
|---|---|---|
| 1950 | 3,696 Degree days | — |
| 1951 | 3,496 Degree days | -5.4% |
| 1952 | 3,312 Degree days | -5.3% |
| 1953 | 3,146 Degree days | -5.0% |
| 1954 | 3,478 Degree days | +10.6% |
| 1955 | 3,864 Degree days | +11.1% |
| 1956 | 3,497 Degree days | -9.5% |
| 1957 | 3,302 Degree days | -5.6% |
| 1958 | 2,852 Degree days | -13.6% |
| 1959 | 3,415 Degree days | +19.7% |
| 1960 | 3,438 Degree days | +0.7% |
| 1961 | 3,279 Degree days | -4.6% |
| 1962 | 3,275 Degree days | -0.1% |
| 1963 | 3,196 Degree days | -2.4% |
| 1964 | 3,650 Degree days | +14.2% |
| 1965 | 3,215 Degree days | -11.9% |
| 1966 | 3,236 Degree days | +0.6% |
| 1967 | 3,223 Degree days | -0.4% |
| 1968 | 3,377 Degree days | +4.8% |
| 1969 | 3,532 Degree days | +4.6% |
| 1970 | 3,381 Degree days | -4.3% |
| 1971 | 3,636 Degree days | +7.5% |
| 1972 | 3,564 Degree days | -2.0% |
| 1973 | 3,294 Degree days | -7.6% |
| 1974 | 3,276 Degree days | -0.6% |
| 1975 | 3,493 Degree days | +6.7% |
| 1976 | 3,233 Degree days | -7.5% |
| 1977 | 3,281 Degree days | +1.5% |
| 1978 | 3,235 Degree days | -1.4% |
| 1979 | 3,192 Degree days | -1.3% |
| 1980 | 3,214 Degree days | +0.7% |
| 1981 | 3,103 Degree days | -3.4% |
| 1982 | 3,444 Degree days | +11.0% |
| 1983 | 3,151 Degree days | -8.5% |
| 1984 | 3,418 Degree days | +8.5% |
| 1985 | 3,582 Degree days | +4.8% |
| 1986 | 3,015 Degree days | -15.8% |
| 1987 | 2,869 Degree days | -4.9% |
| 1988 | 3,086 Degree days | +7.6% |
| 1989 | 3,212 Degree days | +4.1% |
| 1990 | 3,094 Degree days | -3.7% |
| 1991 | 3,061 Degree days | -1.0% |
| 1992 | 2,771 Degree days | -9.5% |
| 1993 | 3,213 Degree days | +16.0% |
| 1994 | 3,021 Degree days | -6.0% |
| 1995 | 3,004 Degree days | -0.6% |
| 1996 | 3,321 Degree days | +10.6% |
| 1997 | 3,077 Degree days | -7.4% |
| 1998 | 2,996 Degree days | -2.6% |
| 1999 | 3,255 Degree days | +8.6% |
| 2000 | 3,282 Degree days | +0.8% |
| 2001 | 3,208 Degree days | -2.2% |
| 2002 | 3,188 Degree days | -0.6% |
| 2003 | 2,996 Degree days | -6.0% |
| 2004 | 2,836 Degree days | -5.3% |
| 2005 | 2,921 Degree days | +3.0% |
| 2006 | 3,071 Degree days | +5.1% |
| 2007 | 3,175 Degree days | +3.4% |
| 2008 | 3,387 Degree days | +6.7% |
| 2009 | 3,251 Degree days | -4.0% |
| 2010 | 3,039 Degree days | -6.5% |
| 2011 | 3,428 Degree days | +12.8% |
| 2012 | 3,174 Degree days | -7.4% |
| 2013 | 3,111 Degree days | -2.0% |
| 2014 | 2,867 Degree days | -7.8% |
| 2015 | 2,600 Degree days | -9.3% |
| 2016 | 2,832 Degree days | +8.9% |
| 2017 | 3,176 Degree days | +12.2% |
| 2018 | 2,899 Degree days | -8.7% |
| 2019 | 3,049 Degree days | +5.2% |
| 2020 | 2,946 Degree days | -3.4% |
| 2021 | 3,030 Degree days | +2.9% |
| 2022 | 3,108 Degree days | +2.6% |
| 2023 | 3,069 Degree days | -1.2% |
| 2024 | 3,105 Degree days | +1.1% |
| 2025 | 2,768 Degree days | -10.8% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1950s | 3,406 Degree days | 2,852 Degree days | 3,864 Degree days | 10 |
| 1960s | 3,342 Degree days | 3,196 Degree days | 3,650 Degree days | 10 |
| 1970s | 3,358 Degree days | 3,192 Degree days | 3,636 Degree days | 10 |
| 1980s | 3,209 Degree days | 2,869 Degree days | 3,582 Degree days | 10 |
| 1990s | 3,081 Degree days | 2,771 Degree days | 3,321 Degree days | 10 |
| 2000s | 3,132 Degree days | 2,836 Degree days | 3,387 Degree days | 10 |
| 2010s | 3,017 Degree days | 2,600 Degree days | 3,428 Degree days | 10 |
| 2020s | 3,004 Degree days | 2,768 Degree days | 3,108 Degree days | 6 |
More reference data data for Seattle
- Cooling and heating degree days - Cities and FUAs — Cooling degree 6.62 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -41.07 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating -366.52 Degree days (2025)
- Cooling and heating degree days - Cities and FUAs — Change in heating 53.84 % change on previous year (2024)
- Cooling and heating degree days - Cities and FUAs, annual growth rate -10.83 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Change in cooling -368.13 % change on previous year (2025)
- Cooling and heating degree days - Cities and FUAs — Cooling degree -89.49 % change on previous year (2025)
- Precipitation - Cities and FUAs — Extreme precipitation days 21.53 Days per year (2024)
- Precipitation - Cities and FUAs — Change in extreme precipitation -1.84 Days per year (2024)
- Dependency ratio - Cities and FUAs 21.9 Percentage of population aged 15-64 years (2024)
Frequently asked questions
- What is cooling and heating degree days - cities and fuas in Seattle?
- Cooling and heating degree days - cities and fuas in Seattle was 2,768 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 Seattle?
- The highest recorded value was 3,864 Degree days in 1955.
- What is the lowest cooling and heating degree days - cities and fuas recorded in Seattle?
- The lowest recorded value was 2,600 Degree days in 2015.
- How does Seattle rank for cooling and heating degree days - cities and fuas?
- Seattle ranks 110th out of 1314 regions with data for 2025.
- Is cooling and heating degree days - cities and fuas rising or falling in Seattle?
- Over the last ten years it is up 6.5%. The long-run trend across the full record is falling.
- Where does this Seattle 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