# Heating degree days in California

Heating degree days in California was 2,518 degree days (base 65°F) in 2025. Source: NOAA National Centers for Environmental Information.

- Indicator id: `heating_degree_days_annual`
- Place id: `us-state-06`
- 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/4/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/4/hdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/heating-degree-days/california
- API: https://invokely.ai/api/v1/series?indicator=heating_degree_days_annual&place=us-state-06

| Period | degree days (base 65°F) |
|---|---:|
| 2025 | 2,518 |
| 2024 | 2,717 |
| 2023 | 3,085 |
| 2022 | 2,672 |
| 2021 | 2,689 |
| 2020 | 2,570 |
| 2019 | 2,950 |
| 2018 | 2,546 |
| 2017 | 2,449 |
| 2016 | 2,445 |
| 2015 | 2,347 |
| 2014 | 2,095 |
| 2013 | 2,712 |
| 2012 | 2,748 |
| 2011 | 3,187 |
| 2010 | 3,092 |
| 2009 | 2,887 |
| 2008 | 2,868 |
| 2007 | 2,882 |
| 2006 | 3,021 |
| 2005 | 2,820 |
| 2004 | 2,848 |
| 2003 | 2,840 |
| 2002 | 2,952 |
| 2001 | 2,970 |
| 2000 | 2,836 |
| 1999 | 3,058 |
| 1998 | 3,416 |
| 1997 | 2,667 |
| 1996 | 2,655 |
| 1995 | 2,735 |
| 1994 | 3,163 |
| 1993 | 2,920 |
| 1992 | 2,721 |
| 1991 | 3,029 |
| 1990 | 3,075 |
| 1989 | 2,936 |
| 1988 | 2,896 |
| 1987 | 3,025 |
| 1986 | 2,724 |
| 1985 | 3,277 |
| 1984 | 3,057 |
| 1983 | 3,056 |
| 1982 | 3,431 |
| 1981 | 2,816 |
| 1980 | 2,939 |
| 1979 | 3,204 |
| 1978 | 3,142 |
| 1977 | 3,056 |
| 1976 | 3,037 |
| 1975 | 3,613 |
| 1974 | 3,300 |
| 1973 | 3,400 |
| 1972 | 3,284 |
| 1971 | 3,694 |
| 1970 | 3,175 |
| 1969 | 3,284 |
| 1968 | 3,145 |
| 1967 | 3,377 |
| 1966 | 3,137 |
| 1965 | 3,378 |
| 1964 | 3,515 |
| 1963 | 3,286 |
| 1962 | 3,321 |
| 1961 | 3,196 |
| 1960 | 3,240 |
| 1959 | 2,755 |
| 1958 | 2,867 |
| 1957 | 3,300 |
| 1956 | 3,333 |
| 1955 | 3,614 |
| 1954 | 3,193 |
| 1953 | 3,310 |
| 1952 | 3,593 |
| 1951 | 3,398 |
| 1950 | 3,119 |
| 1949 | 3,676 |
| 1948 | 3,694 |
| 1947 | 3,251 |
| 1946 | 3,549 |
| 1945 | 3,478 |
| 1944 | 3,567 |
| 1943 | 3,092 |
| 1942 | 3,408 |
| 1941 | 3,187 |
| 1940 | 2,860 |
| 1939 | 3,106 |
| 1938 | 3,332 |
| 1937 | 3,498 |
| 1936 | 3,014 |
| 1935 | 3,561 |
| 1934 | 2,686 |
| 1933 | 3,592 |
| 1932 | 3,435 |
| 1931 | 3,086 |
| 1930 | 3,295 |
| 1929 | 3,371 |
| 1928 | 3,202 |
| 1927 | 3,385 |
| 1926 | 2,876 |
| 1925 | 3,286 |
| 1924 | 3,391 |
| 1923 | 3,467 |
| 1922 | 3,800 |
| 1921 | 3,359 |
| 1920 | 3,665 |
| 1919 | 3,648 |
| 1918 | 3,492 |
| 1917 | 3,636 |
| 1916 | 3,771 |
| 1915 | 3,436 |
| 1914 | 3,207 |
| 1913 | 3,638 |
| 1912 | 3,731 |
| 1911 | 3,842 |
| 1910 | 3,299 |
| 1909 | 3,726 |
| 1908 | 3,684 |
| 1907 | 3,443 |
| 1906 | 3,379 |
| 1905 | 3,285 |
| 1904 | 3,265 |
| 1903 | 3,527 |
| 1902 | 3,674 |
| 1901 | 3,309 |
| 1900 | 3,038 |
| 1899 | 3,450 |
| 1898 | 3,530 |
| 1897 | 3,642 |
| 1896 | 3,261 |
| 1895 | 3,492 |