# Heating degree days in Washington

Heating degree days in Washington was 5,181 degree days (base 65°F) in 2025. Source: NOAA National Centers for Environmental Information.

- Indicator id: `heating_degree_days_annual`
- Place id: `us-state-53`
- Unit: degree days (base 65°F)
- Definition: Sum over January to December of the degrees by which the daily mean temperature falls below 65°F, a measure of heating demand. NOAA estimates monthly values from nClimDiv temperatures and weights areas by population (2010 Census).
- Note: NOAA publishes these for operational monitoring; they can differ from official degree day publications.
- Source: NOAA National Centers for Environmental Information, NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide (https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/45/hdd/12/12/1895-2025/data.json)
- Publisher page: https://invokely.ai/en/publishers/noaa-ncei
- Retrieved: 2026-10-12
- License: Public domain (US government work); NCEI asks users to cite the nClimDiv dataset
- Citation: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide. From the NOAA Monthly U.S. Climate Divisional Database (nClimDiv), doi:10.7289/V5M32STR. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/45/hdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/heating-degree-days/washington
- API: https://invokely.ai/api/v1/series?indicator=heating_degree_days_annual&place=us-state-53

| Period | degree days (base 65°F) |
|---|---:|
| 2025 | 5,181 |
| 2024 | 5,353 |
| 2023 | 5,337 |
| 2022 | 5,788 |
| 2021 | 5,562 |
| 2020 | 5,416 |
| 2019 | 5,750 |
| 2018 | 5,382 |
| 2017 | 5,794 |
| 2016 | 5,126 |
| 2015 | 4,889 |
| 2014 | 5,256 |
| 2013 | 5,751 |
| 2012 | 5,790 |
| 2011 | 6,204 |
| 2010 | 5,577 |
| 2009 | 5,960 |
| 2008 | 6,134 |
| 2007 | 5,837 |
| 2006 | 5,554 |
| 2005 | 5,494 |
| 2004 | 5,238 |
| 2003 | 5,360 |
| 2002 | 5,756 |
| 2001 | 5,820 |
| 2000 | 5,893 |
| 1999 | 5,760 |
| 1998 | 5,303 |
| 1997 | 5,519 |
| 1996 | 6,061 |
| 1995 | 5,353 |
| 1994 | 5,507 |
| 1993 | 5,953 |
| 1992 | 5,175 |
| 1991 | 5,699 |
| 1990 | 5,750 |
| 1989 | 5,797 |
| 1988 | 5,636 |
| 1987 | 5,293 |
| 1986 | 5,565 |
| 1985 | 6,660 |
| 1984 | 6,115 |
| 1983 | 5,701 |
| 1982 | 6,127 |
| 1981 | 5,583 |
| 1980 | 5,873 |
| 1979 | 5,850 |
| 1978 | 5,938 |
| 1977 | 6,037 |
| 1976 | 6,037 |
| 1975 | 6,286 |
| 1974 | 5,851 |
| 1973 | 5,956 |
| 1972 | 6,328 |
| 1971 | 6,338 |
| 1970 | 6,093 |
| 1969 | 6,101 |
| 1968 | 5,911 |
| 1967 | 5,608 |
| 1966 | 5,764 |
| 1965 | 5,823 |
| 1964 | 6,416 |
| 1963 | 5,808 |
| 1962 | 5,951 |
| 1961 | 5,777 |
| 1960 | 6,134 |
| 1959 | 6,108 |
| 1958 | 5,114 |
| 1957 | 6,075 |
| 1956 | 6,271 |
| 1955 | 6,905 |
| 1954 | 6,276 |
| 1953 | 5,580 |
| 1952 | 6,041 |
| 1951 | 6,201 |
| 1950 | 6,569 |
| 1949 | 6,344 |
| 1948 | 6,526 |
| 1947 | 5,722 |
| 1946 | 6,072 |
| 1945 | 5,965 |
| 1944 | 5,822 |
| 1943 | 6,142 |
| 1942 | 5,809 |
| 1941 | 5,281 |
| 1940 | 5,275 |
| 1939 | 5,551 |
| 1938 | 5,732 |
| 1937 | 6,145 |
| 1936 | 5,973 |
| 1935 | 6,157 |
| 1934 | 5,037 |
| 1933 | 6,240 |
| 1932 | 6,065 |
| 1931 | 5,738 |
| 1930 | 6,289 |
| 1929 | 6,455 |
| 1928 | 5,821 |
| 1927 | 6,195 |
| 1926 | 5,310 |
| 1925 | 5,547 |
| 1924 | 6,065 |
| 1923 | 5,885 |
| 1922 | 6,614 |
| 1921 | 6,202 |
| 1920 | 6,283 |
| 1919 | 6,364 |
| 1918 | 5,810 |
| 1917 | 6,222 |
| 1916 | 6,890 |
| 1915 | 5,624 |
| 1914 | 5,742 |
| 1913 | 6,365 |
| 1912 | 6,017 |
| 1911 | 6,488 |
| 1910 | 6,111 |
| 1909 | 6,617 |
| 1908 | 6,106 |
| 1907 | 6,171 |
| 1906 | 5,743 |
| 1905 | 5,927 |
| 1904 | 5,797 |
| 1903 | 6,256 |
| 1902 | 6,010 |
| 1901 | 5,959 |
| 1900 | 5,594 |
| 1899 | 6,203 |
| 1898 | 6,027 |
| 1897 | 6,176 |
| 1896 | 6,290 |
| 1895 | 6,169 |