Data / Heating degree days / California

Heating degree days in California

Heating degree days in California was 2,518 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 7.3% from 2024. That is the 41st highest of 48 states in 2025.

2025, degree days (base 65°F)2,518
Change on 2024-7.3%
Rank41st of 48US states ranked
Series high3,8421911
Series low2,0952014

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Heating degree days in California, 1895 to 2025

2,0002,5003,0003,5004,000189519141933195219711990200920251895: 3,492 degree days (base 65°F)1896: 3,261 degree days (base 65°F)1897: 3,642 degree days (base 65°F)1898: 3,530 degree days (base 65°F)1899: 3,450 degree days (base 65°F)1900: 3,038 degree days (base 65°F)1901: 3,309 degree days (base 65°F)1902: 3,674 degree days (base 65°F)1903: 3,527 degree days (base 65°F)1904: 3,265 degree days (base 65°F)1905: 3,285 degree days (base 65°F)1906: 3,379 degree days (base 65°F)1907: 3,443 degree days (base 65°F)1908: 3,684 degree days (base 65°F)1909: 3,726 degree days (base 65°F)1910: 3,299 degree days (base 65°F)1911: 3,842 degree days (base 65°F)1912: 3,731 degree days (base 65°F)1913: 3,638 degree days (base 65°F)1914: 3,207 degree days (base 65°F)1915: 3,436 degree days (base 65°F)1916: 3,771 degree days (base 65°F)1917: 3,636 degree days (base 65°F)1918: 3,492 degree days (base 65°F)1919: 3,648 degree days (base 65°F)1920: 3,665 degree days (base 65°F)1921: 3,359 degree days (base 65°F)1922: 3,800 degree days (base 65°F)1923: 3,467 degree days (base 65°F)1924: 3,391 degree days (base 65°F)1925: 3,286 degree days (base 65°F)1926: 2,876 degree days (base 65°F)1927: 3,385 degree days (base 65°F)1928: 3,202 degree days (base 65°F)1929: 3,371 degree days (base 65°F)1930: 3,295 degree days (base 65°F)1931: 3,086 degree days (base 65°F)1932: 3,435 degree days (base 65°F)1933: 3,592 degree days (base 65°F)1934: 2,686 degree days (base 65°F)1935: 3,561 degree days (base 65°F)1936: 3,014 degree days (base 65°F)1937: 3,498 degree days (base 65°F)1938: 3,332 degree days (base 65°F)1939: 3,106 degree days (base 65°F)1940: 2,860 degree days (base 65°F)1941: 3,187 degree days (base 65°F)1942: 3,408 degree days (base 65°F)1943: 3,092 degree days (base 65°F)1944: 3,567 degree days (base 65°F)1945: 3,478 degree days (base 65°F)1946: 3,549 degree days (base 65°F)1947: 3,251 degree days (base 65°F)1948: 3,694 degree days (base 65°F)1949: 3,676 degree days (base 65°F)1950: 3,119 degree days (base 65°F)1951: 3,398 degree days (base 65°F)1952: 3,593 degree days (base 65°F)1953: 3,310 degree days (base 65°F)1954: 3,193 degree days (base 65°F)1955: 3,614 degree days (base 65°F)1956: 3,333 degree days (base 65°F)1957: 3,300 degree days (base 65°F)1958: 2,867 degree days (base 65°F)1959: 2,755 degree days (base 65°F)1960: 3,240 degree days (base 65°F)1961: 3,196 degree days (base 65°F)1962: 3,321 degree days (base 65°F)1963: 3,286 degree days (base 65°F)1964: 3,515 degree days (base 65°F)1965: 3,378 degree days (base 65°F)1966: 3,137 degree days (base 65°F)1967: 3,377 degree days (base 65°F)1968: 3,145 degree days (base 65°F)1969: 3,284 degree days (base 65°F)1970: 3,175 degree days (base 65°F)1971: 3,694 degree days (base 65°F)1972: 3,284 degree days (base 65°F)1973: 3,400 degree days (base 65°F)1974: 3,300 degree days (base 65°F)1975: 3,613 degree days (base 65°F)1976: 3,037 degree days (base 65°F)1977: 3,056 degree days (base 65°F)1978: 3,142 degree days (base 65°F)1979: 3,204 degree days (base 65°F)1980: 2,939 degree days (base 65°F)1981: 2,816 degree days (base 65°F)1982: 3,431 degree days (base 65°F)1983: 3,056 degree days (base 65°F)1984: 3,057 degree days (base 65°F)1985: 3,277 degree days (base 65°F)1986: 2,724 degree days (base 65°F)1987: 3,025 degree days (base 65°F)1988: 2,896 degree days (base 65°F)1989: 2,936 degree days (base 65°F)1990: 3,075 degree days (base 65°F)1991: 3,029 degree days (base 65°F)1992: 2,721 degree days (base 65°F)1993: 2,920 degree days (base 65°F)1994: 3,163 degree days (base 65°F)1995: 2,735 degree days (base 65°F)1996: 2,655 degree days (base 65°F)1997: 2,667 degree days (base 65°F)1998: 3,416 degree days (base 65°F)1999: 3,058 degree days (base 65°F)2000: 2,836 degree days (base 65°F)2001: 2,970 degree days (base 65°F)2002: 2,952 degree days (base 65°F)2003: 2,840 degree days (base 65°F)2004: 2,848 degree days (base 65°F)2005: 2,820 degree days (base 65°F)2006: 3,021 degree days (base 65°F)2007: 2,882 degree days (base 65°F)2008: 2,868 degree days (base 65°F)2009: 2,887 degree days (base 65°F)2010: 3,092 degree days (base 65°F)2011: 3,187 degree days (base 65°F)2012: 2,748 degree days (base 65°F)2013: 2,712 degree days (base 65°F)2014: 2,095 degree days (base 65°F)2015: 2,347 degree days (base 65°F)2016: 2,445 degree days (base 65°F)2017: 2,449 degree days (base 65°F)2018: 2,546 degree days (base 65°F)2019: 2,950 degree days (base 65°F)2020: 2,570 degree days (base 65°F)2021: 2,689 degree days (base 65°F)2022: 2,672 degree days (base 65°F)2023: 3,085 degree days (base 65°F)2024: 2,717 degree days (base 65°F)2025: 2,518 degree days (base 65°F)
degree days (base 65°F). Source: NOAA NCEI, NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide. Retrieved 2026-10-12, published 2026-10-06.
All 131 values
Perioddegree days (base 65°F)
20252,518
20242,717
20233,085
20222,672
20212,689
20202,570
20192,950
20182,546
20172,449
20162,445
20152,347
20142,095
20132,712
20122,748
20113,187
20103,092
20092,887
20082,868
20072,882
20063,021
20052,820
20042,848
20032,840
20022,952
20012,970
20002,836
19993,058
19983,416
19972,667
19962,655
19952,735
19943,163
19932,920
19922,721
19913,029
19903,075
19892,936
19882,896
19873,025
19862,724
19853,277
19843,057
19833,056
19823,431
19812,816
19802,939
19793,204
19783,142
19773,056
19763,037
19753,613
19743,300
19733,400
19723,284
19713,694
19703,175
19693,284
19683,145
19673,377
19663,137
19653,378
19643,515
19633,286
19623,321
19613,196
19603,240
19592,755
19582,867
19573,300
19563,333
19553,614
19543,193
19533,310
19523,593
19513,398
19503,119
19493,676
19483,694
19473,251
19463,549
19453,478
19443,567
19433,092
19423,408
19413,187
19402,860
19393,106
19383,332
19373,498
19363,014
19353,561
19342,686
19333,592
19323,435
19313,086
19303,295
19293,371
19283,202
19273,385
19262,876
19253,286
19243,391
19233,467
19223,800
19213,359
19203,665
19193,648
19183,492
19173,636
19163,771
19153,436
19143,207
19133,638
19123,731
19113,842
19103,299
19093,726
19083,684
19073,443
19063,379
19053,285
19043,265
19033,527
19023,674
19013,309
19003,038
18993,450
18983,530
18973,642
18963,261
18953,492

Compared with United States

Place2025
California2,518
United States4,062

Rankings

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).

NOAA publishes these for operational monitoring; they can differ from official degree day publications.

How to cite

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.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

NOAA National Centers for Environmental Information. (2026). NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide (Heating degree days, California, 1895 to 2025) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/4/hdd/12/12/1895-2025/data.json

MLA 9

NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide, Heating degree days, California, 1895 to 2025. NOAA National Centers for Environmental Information, 6 Oct. 2026, https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/4/hdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/heating-degree-days/california. Accessed 12 Oct. 2026.

Chicago (author-date)

NOAA National Centers for Environmental Information. 2026. NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide. Heating degree days, California, 1895 to 2025. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/4/hdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/heating-degree-days/california.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide, Heating degree days, California, 1895 to 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/4/hdd/12/12/1895-2025/data.json, via Invokely: https://invokely.ai/en/heating-degree-days/california (Accessed: 12 October 2026).

BibTeX
@misc{noaa_heating_degree_days_california_2025,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide: Heating degree days, California, 1895 to 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/4/hdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/heating-degree-days/california. Publisher attribution: 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.},
}
RIS
TY  - DATA
AU  - NOAA National Centers for Environmental Information
TI  - NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide: Heating degree days, California, 1895 to 2025
PY  - 2026
DA  - 2026/10/06
PB  - NOAA National Centers for Environmental Information
DB  - Invokely
UR  - https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/4/hdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/heating-degree-days/california
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/heating-degree-days/california.
N1  - Publisher attribution: 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.
ER  -
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Questions

What is the heating degree days in California?

Heating degree days in California was 2,518 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 7.3% from 2024. That is the 41st highest of 48 states in 2025.

Where does this figure come from?

NOAA National Centers for Environmental Information. NOAA Climate at a Glance, January to December heating degree days (base 65°F), contiguous US and statewide. Retrieved by Invokely on 2026-10-12.

What was the highest heating degree days in California?

3,842 degree days (base 65°F) in 1911, the highest value since 1895 in this series.

Heating degree days elsewhere in United States

Related statistics for California

All statistics for California | California in figures