# Heating degree days in United States

Heating degree days in United States was 4,062 degree days (base 65°F) in 2025. Source: NOAA National Centers for Environmental Information.

- Indicator id: `heating_degree_days_annual`
- Place id: `us`
- 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/national/time-series/110/hdd/12/12/1895-2026/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/national/time-series/110/hdd/12/12/1895-2026/data.json. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/heating-degree-days/united-states
- API: https://invokely.ai/api/v1/series?indicator=heating_degree_days_annual&place=us

| Period | degree days (base 65°F) |
|---|---:|
| 2025 | 4,062 |
| 2024 | 3,721 |
| 2023 | 3,828 |
| 2022 | 4,268 |
| 2021 | 3,945 |
| 2020 | 3,920 |
| 2019 | 4,327 |
| 2018 | 4,292 |
| 2017 | 3,833 |
| 2016 | 3,879 |
| 2015 | 4,078 |
| 2014 | 4,535 |
| 2013 | 4,444 |
| 2012 | 3,739 |
| 2011 | 4,280 |
| 2010 | 4,429 |
| 2009 | 4,433 |
| 2008 | 4,436 |
| 2007 | 4,211 |
| 2006 | 3,979 |
| 2005 | 4,272 |
| 2004 | 4,260 |
| 2003 | 4,441 |
| 2002 | 4,266 |
| 2001 | 4,156 |
| 2000 | 4,376 |
| 1999 | 4,108 |
| 1998 | 3,949 |
| 1997 | 4,478 |
| 1996 | 4,629 |
| 1995 | 4,465 |
| 1994 | 4,428 |
| 1993 | 4,657 |
| 1992 | 4,392 |
| 1991 | 4,182 |
| 1990 | 4,008 |
| 1989 | 4,662 |
| 1988 | 4,612 |
| 1987 | 4,329 |
| 1986 | 4,274 |
| 1985 | 4,646 |
| 1984 | 4,518 |
| 1983 | 4,642 |
| 1982 | 4,637 |
| 1981 | 4,529 |
| 1980 | 4,718 |
| 1979 | 4,811 |
| 1978 | 4,976 |
| 1977 | 4,636 |
| 1976 | 4,764 |
| 1975 | 4,538 |
| 1974 | 4,464 |
| 1973 | 4,406 |
| 1972 | 4,750 |
| 1971 | 4,623 |
| 1970 | 4,736 |
| 1969 | 4,811 |
| 1968 | 4,766 |
| 1967 | 4,678 |
| 1966 | 4,785 |
| 1965 | 4,628 |
| 1964 | 4,633 |
| 1963 | 4,815 |
| 1962 | 4,781 |
| 1961 | 4,650 |
| 1960 | 4,850 |
| 1959 | 4,533 |
| 1958 | 4,835 |
| 1957 | 4,487 |
| 1956 | 4,540 |
| 1955 | 4,675 |
| 1954 | 4,378 |
| 1953 | 4,232 |
| 1952 | 4,542 |
| 1951 | 4,691 |
| 1950 | 4,654 |
| 1949 | 4,403 |
| 1948 | 4,713 |
| 1947 | 4,729 |
| 1946 | 4,234 |
| 1945 | 4,635 |
| 1944 | 4,674 |
| 1943 | 4,768 |
| 1942 | 4,628 |
| 1941 | 4,449 |
| 1940 | 4,890 |
| 1939 | 4,393 |
| 1938 | 4,291 |
| 1937 | 4,774 |
| 1936 | 4,757 |
| 1935 | 4,747 |
| 1934 | 4,466 |
| 1933 | 4,438 |
| 1932 | 4,542 |
| 1931 | 4,213 |
| 1930 | 4,645 |
| 1929 | 4,789 |
| 1928 | 4,630 |
| 1927 | 4,421 |
| 1926 | 4,858 |
| 1925 | 4,634 |
| 1924 | 5,019 |
| 1923 | 4,662 |
| 1922 | 4,540 |
| 1921 | 4,122 |
| 1920 | 4,884 |
| 1919 | 4,661 |
| 1918 | 4,724 |
| 1917 | 5,268 |
| 1916 | 4,881 |
| 1915 | 4,694 |
| 1914 | 4,802 |
| 1913 | 4,515 |
| 1912 | 5,072 |
| 1911 | 4,596 |
| 1910 | 4,679 |
| 1909 | 4,745 |
| 1908 | 4,556 |
| 1907 | 4,800 |
| 1906 | 4,664 |
| 1905 | 4,942 |
| 1904 | 5,048 |
| 1903 | 4,852 |
| 1902 | 4,748 |
| 1901 | 4,937 |
| 1900 | 4,521 |
| 1899 | 4,842 |
| 1898 | 4,704 |
| 1897 | 4,711 |
| 1896 | 4,661 |
| 1895 | 5,092 |