Data / Heating degree days / Washington

Heating degree days in Washington

Heating degree days in Washington was 5,181 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 3.2% from 2024. That is the 24th highest of 48 states in 2025.

2025, degree days (base 65°F)5,181
Change on 2024-3.2%
Rank24th of 48US states ranked
Series high6,9051955
Series low4,8892015

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

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Heating degree days in Washington, 1895 to 2025

4,5005,0005,5006,0006,5007,000189519141933195219711990200920251895: 6,169 degree days (base 65°F)1896: 6,290 degree days (base 65°F)1897: 6,176 degree days (base 65°F)1898: 6,027 degree days (base 65°F)1899: 6,203 degree days (base 65°F)1900: 5,594 degree days (base 65°F)1901: 5,959 degree days (base 65°F)1902: 6,010 degree days (base 65°F)1903: 6,256 degree days (base 65°F)1904: 5,797 degree days (base 65°F)1905: 5,927 degree days (base 65°F)1906: 5,743 degree days (base 65°F)1907: 6,171 degree days (base 65°F)1908: 6,106 degree days (base 65°F)1909: 6,617 degree days (base 65°F)1910: 6,111 degree days (base 65°F)1911: 6,488 degree days (base 65°F)1912: 6,017 degree days (base 65°F)1913: 6,365 degree days (base 65°F)1914: 5,742 degree days (base 65°F)1915: 5,624 degree days (base 65°F)1916: 6,890 degree days (base 65°F)1917: 6,222 degree days (base 65°F)1918: 5,810 degree days (base 65°F)1919: 6,364 degree days (base 65°F)1920: 6,283 degree days (base 65°F)1921: 6,202 degree days (base 65°F)1922: 6,614 degree days (base 65°F)1923: 5,885 degree days (base 65°F)1924: 6,065 degree days (base 65°F)1925: 5,547 degree days (base 65°F)1926: 5,310 degree days (base 65°F)1927: 6,195 degree days (base 65°F)1928: 5,821 degree days (base 65°F)1929: 6,455 degree days (base 65°F)1930: 6,289 degree days (base 65°F)1931: 5,738 degree days (base 65°F)1932: 6,065 degree days (base 65°F)1933: 6,240 degree days (base 65°F)1934: 5,037 degree days (base 65°F)1935: 6,157 degree days (base 65°F)1936: 5,973 degree days (base 65°F)1937: 6,145 degree days (base 65°F)1938: 5,732 degree days (base 65°F)1939: 5,551 degree days (base 65°F)1940: 5,275 degree days (base 65°F)1941: 5,281 degree days (base 65°F)1942: 5,809 degree days (base 65°F)1943: 6,142 degree days (base 65°F)1944: 5,822 degree days (base 65°F)1945: 5,965 degree days (base 65°F)1946: 6,072 degree days (base 65°F)1947: 5,722 degree days (base 65°F)1948: 6,526 degree days (base 65°F)1949: 6,344 degree days (base 65°F)1950: 6,569 degree days (base 65°F)1951: 6,201 degree days (base 65°F)1952: 6,041 degree days (base 65°F)1953: 5,580 degree days (base 65°F)1954: 6,276 degree days (base 65°F)1955: 6,905 degree days (base 65°F)1956: 6,271 degree days (base 65°F)1957: 6,075 degree days (base 65°F)1958: 5,114 degree days (base 65°F)1959: 6,108 degree days (base 65°F)1960: 6,134 degree days (base 65°F)1961: 5,777 degree days (base 65°F)1962: 5,951 degree days (base 65°F)1963: 5,808 degree days (base 65°F)1964: 6,416 degree days (base 65°F)1965: 5,823 degree days (base 65°F)1966: 5,764 degree days (base 65°F)1967: 5,608 degree days (base 65°F)1968: 5,911 degree days (base 65°F)1969: 6,101 degree days (base 65°F)1970: 6,093 degree days (base 65°F)1971: 6,338 degree days (base 65°F)1972: 6,328 degree days (base 65°F)1973: 5,956 degree days (base 65°F)1974: 5,851 degree days (base 65°F)1975: 6,286 degree days (base 65°F)1976: 6,037 degree days (base 65°F)1977: 6,037 degree days (base 65°F)1978: 5,938 degree days (base 65°F)1979: 5,850 degree days (base 65°F)1980: 5,873 degree days (base 65°F)1981: 5,583 degree days (base 65°F)1982: 6,127 degree days (base 65°F)1983: 5,701 degree days (base 65°F)1984: 6,115 degree days (base 65°F)1985: 6,660 degree days (base 65°F)1986: 5,565 degree days (base 65°F)1987: 5,293 degree days (base 65°F)1988: 5,636 degree days (base 65°F)1989: 5,797 degree days (base 65°F)1990: 5,750 degree days (base 65°F)1991: 5,699 degree days (base 65°F)1992: 5,175 degree days (base 65°F)1993: 5,953 degree days (base 65°F)1994: 5,507 degree days (base 65°F)1995: 5,353 degree days (base 65°F)1996: 6,061 degree days (base 65°F)1997: 5,519 degree days (base 65°F)1998: 5,303 degree days (base 65°F)1999: 5,760 degree days (base 65°F)2000: 5,893 degree days (base 65°F)2001: 5,820 degree days (base 65°F)2002: 5,756 degree days (base 65°F)2003: 5,360 degree days (base 65°F)2004: 5,238 degree days (base 65°F)2005: 5,494 degree days (base 65°F)2006: 5,554 degree days (base 65°F)2007: 5,837 degree days (base 65°F)2008: 6,134 degree days (base 65°F)2009: 5,960 degree days (base 65°F)2010: 5,577 degree days (base 65°F)2011: 6,204 degree days (base 65°F)2012: 5,790 degree days (base 65°F)2013: 5,751 degree days (base 65°F)2014: 5,256 degree days (base 65°F)2015: 4,889 degree days (base 65°F)2016: 5,126 degree days (base 65°F)2017: 5,794 degree days (base 65°F)2018: 5,382 degree days (base 65°F)2019: 5,750 degree days (base 65°F)2020: 5,416 degree days (base 65°F)2021: 5,562 degree days (base 65°F)2022: 5,788 degree days (base 65°F)2023: 5,337 degree days (base 65°F)2024: 5,353 degree days (base 65°F)2025: 5,181 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)
20255,181
20245,353
20235,337
20225,788
20215,562
20205,416
20195,750
20185,382
20175,794
20165,126
20154,889
20145,256
20135,751
20125,790
20116,204
20105,577
20095,960
20086,134
20075,837
20065,554
20055,494
20045,238
20035,360
20025,756
20015,820
20005,893
19995,760
19985,303
19975,519
19966,061
19955,353
19945,507
19935,953
19925,175
19915,699
19905,750
19895,797
19885,636
19875,293
19865,565
19856,660
19846,115
19835,701
19826,127
19815,583
19805,873
19795,850
19785,938
19776,037
19766,037
19756,286
19745,851
19735,956
19726,328
19716,338
19706,093
19696,101
19685,911
19675,608
19665,764
19655,823
19646,416
19635,808
19625,951
19615,777
19606,134
19596,108
19585,114
19576,075
19566,271
19556,905
19546,276
19535,580
19526,041
19516,201
19506,569
19496,344
19486,526
19475,722
19466,072
19455,965
19445,822
19436,142
19425,809
19415,281
19405,275
19395,551
19385,732
19376,145
19365,973
19356,157
19345,037
19336,240
19326,065
19315,738
19306,289
19296,455
19285,821
19276,195
19265,310
19255,547
19246,065
19235,885
19226,614
19216,202
19206,283
19196,364
19185,810
19176,222
19166,890
19155,624
19145,742
19136,365
19126,017
19116,488
19106,111
19096,617
19086,106
19076,171
19065,743
19055,927
19045,797
19036,256
19026,010
19015,959
19005,594
18996,203
18986,027
18976,176
18966,290
18956,169

Compared with United States

Place2025
Washington5,181
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/45/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, 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/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, 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/hdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/heating-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 heating degree days (base 65°F), contiguous US and statewide. Heating 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/hdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/heating-degree-days/washington.

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

BibTeX
@misc{noaa_heating_degree_days_washington_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, 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/hdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/heating-degree-days/washington. 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/45/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, 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/hdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/heating-degree-days/washington
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/heating-degree-days/washington.
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/45/hdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -
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Questions

What is the heating degree days in Washington?

Heating degree days in Washington was 5,181 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 3.2% from 2024. That is the 24th 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 Washington?

6,905 degree days (base 65°F) in 1955, the highest value since 1895 in this series.

Heating degree days elsewhere in United States

Related statistics for Washington

All statistics for Washington | Washington in figures