Cooling degree days in Washington

Cooling degree days in Washington was 298 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is up 18.7% from 2024. That is the 46th highest of 48 states in 2025.

2025, degree days (base 65°F)298

Change on 2024+18.7%

Rank46th of 48US states ranked

Series high3072015

Series low551954

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 Washington, 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	298
2024	251
2023	275
2022	305
2021	278
2020	183
2019	185
2018	237
2017	254
2016	174
2015	307
2014	269
2013	223
2012	163
2011	122
2010	120
2009	226
2008	131
2007	166
2006	187
2005	165
2004	239
2003	230
2002	155
2001	136
2000	113
1999	118
1998	261
1997	177
1996	159
1995	139
1994	199
1993	96
1992	185
1991	166
1990	227
1989	120
1988	116
1987	146
1986	164
1985	178
1984	111
1983	102
1982	122
1981	152
1980	81
1979	164
1978	132
1977	159
1976	84
1975	115
1974	130
1973	108
1972	128
1971	161
1970	137
1969	114
1968	120
1967	250
1966	101
1965	136
1964	70
1963	118
1962	90
1961	230
1960	136
1959	109
1958	304
1957	104
1956	130
1955	72
1954	55
1953	110
1952	128
1951	128
1950	128
1949	100
1948	88
1947	102
1946	109
1945	127
1944	129
1943	102
1942	187
1941	173
1940	163
1939	134
1938	162
1937	115
1936	137
1935	109
1934	121
1933	111
1932	87
1931	122
1930	124
1929	110
1928	132
1927	133
1926	148
1925	137
1924	113
1923	158
1922	137
1921	86
1920	121
1919	94
1918	134
1917	118
1916	71
1915	154
1914	114
1913	115
1912	87
1911	104
1910	76
1909	68
1908	126
1907	80
1906	188
1905	119
1904	119
1903	83
1902	71
1901	96
1900	97
1899	84
1898	151
1897	129
1896	139
1895	83

Compared with United States

Place	2025
Washington	298
United States	1,502

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.

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/45/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, Washington, 1895 to 2025) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/45/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, Washington, 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/45/cdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/cooling-degree-days/washington. 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, Washington, 1895 to 2025. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/45/cdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/cooling-degree-days/washington.

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, Washington, 1895 to 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/45/cdd/12/12/1895-2025/data.json, via Invokely: https://invokely.ai/en/cooling-degree-days/washington (Accessed: 12 October 2026).

BibTeX

@misc{noaa_cooling_degree_days_washington_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, Washington, 1895 to 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/45/cdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/washington. 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/45/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, Washington, 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/45/cdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/cooling-degree-days/washington
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/washington.
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/45/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -

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Questions

What is the cooling degree days in Washington?

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 Washington?

307 degree days (base 65°F) in 2015, the highest value since 1895 in this series.

Cooling degree days elsewhere in United States

Related statistics for Washington

All statistics for Washington | Washington in figures