Cooling degree days in California

Cooling degree days in California was 948 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 20.5% from 2024. That is the 26th highest of 48 states in 2025.

2025, degree days (base 65°F)948

Change on 2024-20.5%

Rank26th of 48US states ranked

Series high1,2062020

Series low4031912

Next release: Wednesday, 6 October 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

Cooling degree days in California, 1895 to 2025

degree days (base 65°F). Source: NOAA NCEI, NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide. Retrieved 2026-10-12, published 2026-10-06.

All 131 values

Period	degree days (base 65°F)
2025	948
2024	1,192
2023	866
2022	1,205
2021	1,146
2020	1,206
2019	896
2018	1,101
2017	1,167
2016	1,023
2015	1,157
2014	1,173
2013	963
2012	1,019
2011	774
2010	703
2009	965
2008	1,018
2007	888
2006	1,010
2005	813
2004	857
2003	1,057
2002	830
2001	932
2000	831
1999	698
1998	779
1997	960
1996	941
1995	814
1994	859
1993	725
1992	960
1991	738
1990	863
1989	724
1988	800
1987	722
1986	683
1985	786
1984	1,047
1983	814
1982	640
1981	914
1980	664
1979	781
1978	748
1977	738
1976	651
1975	597
1974	751
1973	682
1972	749
1971	738
1970	748
1969	759
1968	668
1967	884
1966	735
1965	566
1964	641
1963	652
1962	633
1961	794
1960	852
1959	861
1958	867
1957	711
1956	621
1955	604
1954	631
1953	616
1952	702
1951	650
1950	659
1949	639
1948	522
1947	659
1946	681
1945	714
1944	508
1943	614
1942	632
1941	535
1940	693
1939	775
1938	703
1937	770
1936	838
1935	671
1934	748
1933	637
1932	613
1931	943
1930	611
1929	755
1928	640
1927	581
1926	727
1925	598
1924	599
1923	520
1922	751
1921	632
1920	568
1919	620
1918	699
1917	751
1916	458
1915	592
1914	522
1913	642
1912	403
1911	451
1910	594
1909	506
1908	552
1907	427
1906	677
1905	569
1904	676
1903	543
1902	541
1901	617
1900	523
1899	544
1898	667
1897	678
1896	647
1895	513

Compared with United States

Place	2025
California	948
United States	1,502

California compared with nearby places

Under 460
460 to 690
690 to 950
950 to 1,300
1,300 to 2,000
2,000 and over
No data

Cooling degree days, 2025, degree days (base 65°F). California is outlined. Same source and period for every area shown. Source: NOAA National Centers for Environmental Information. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

US states by cooling degree days 48 places

Definition

Sum over January to December of the degrees by which the daily mean temperature exceeds 65°F, a measure of cooling 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.

Report a problem with this figure

How to cite

NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December cooling 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/cdd/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 cooling degree days (base 65°F), contiguous US and statewide (Cooling 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/cdd/12/12/1895-2025/data.json

MLA 9

NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide, Cooling 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/cdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/cooling-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 cooling degree days (base 65°F), contiguous US and statewide. Cooling 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/cdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/cooling-degree-days/california.

Harvard

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

BibTeX

@misc{noaa_cooling_degree_days_california_2025,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide: Cooling 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/cdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/california. Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December cooling 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/cdd/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 cooling degree days (base 65°F), contiguous US and statewide: Cooling 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/cdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/cooling-degree-days/california
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/california.
N1  - Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December cooling 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/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -

Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Embed code

<iframe src="https://invokely.ai/embed/cooling-degree-days/california" width="760" height="440" title="Cooling degree days, California, chart from Invokely" loading="lazy" style="border:0;width:100%;max-width:760px" referrerpolicy="strict-origin-when-cross-origin"></iframe>

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest cooling degree days in California? Cite the source.

get_value {"indicator":"cooling_degree_days_annual","place":"us-state-06"}
GET https://invokely.ai/api/v1/value?indicator=cooling_degree_days_annual&place=us-state-06

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

What is the cooling degree days in California?

Where does this figure come from?

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

What was the highest cooling degree days in California?

1,206 degree days (base 65°F) in 2020, the highest value since 1895 in this series.

Cooling degree days elsewhere in United States

Related statistics for California

All statistics for California | California in figures