Cooling degree days in Massachusetts

Cooling degree days in Massachusetts was 587 degree days (base 65°F) in 2025, according to NOAA National Centers for Environmental Information. That is down 13.2% from 2024. That is the 38th highest of 48 states in 2025.

2025, degree days (base 65°F)587

Change on 2024-13.2%

Rank38th of 48US states ranked

Series high7122018

Series low1671902

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 Massachusetts, 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	587
2024	676
2023	562
2022	708
2021	667
2020	702
2019	577
2018	712
2017	477
2016	666
2015	590
2014	444
2013	588
2012	597
2011	579
2010	687
2009	374
2008	498
2007	484
2006	512
2005	633
2004	389
2003	521
2002	547
2001	490
2000	299
1999	605
1998	482
1997	381
1996	393
1995	488
1994	537
1993	476
1992	262
1991	483
1990	451
1989	402
1988	517
1987	376
1986	260
1985	339
1984	453
1983	520
1982	288
1981	412
1980	457
1979	416
1978	349
1977	384
1976	388
1975	454
1974	373
1973	543
1972	336
1971	448
1970	442
1969	407
1968	372
1967	396
1966	396
1965	327
1964	280
1963	358
1962	240
1961	432
1960	334
1959	476
1958	305
1957	385
1956	303
1955	557
1954	259
1953	391
1952	535
1951	344
1950	324
1949	616
1948	402
1947	437
1946	271
1945	358
1944	518
1943	442
1942	344
1941	348
1940	257
1939	418
1938	418
1937	470
1936	317
1935	383
1934	392
1933	363
1932	331
1931	452
1930	450
1929	315
1928	385
1927	226
1926	242
1925	340
1924	285
1923	249
1922	327
1921	400
1920	312
1919	342
1918	302
1917	397
1916	312
1915	244
1914	232
1913	318
1912	283
1911	396
1910	304
1909	253
1908	389
1907	269
1906	374
1905	283
1904	253
1903	177
1902	167
1901	437
1900	426
1899	349
1898	398
1897	271
1896	342
1895	312

Compared with United States

Place	2025
Massachusetts	587
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/19/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, Massachusetts, 1895 to 2025) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/19/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, Massachusetts, 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/19/cdd/12/12/1895-2025/data.json. Invokely, https://invokely.ai/en/cooling-degree-days/massachusetts. 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, Massachusetts, 1895 to 2025. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/19/cdd/12/12/1895-2025/data.json. Also distributed by Invokely, https://invokely.ai/en/cooling-degree-days/massachusetts.

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, Massachusetts, 1895 to 2025 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/19/cdd/12/12/1895-2025/data.json, via Invokely: https://invokely.ai/en/cooling-degree-days/massachusetts (Accessed: 12 October 2026).

BibTeX

@misc{noaa_cooling_degree_days_massachusetts_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, Massachusetts, 1895 to 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/19/cdd/12/12/1895-2025/data.json},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/massachusetts. 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/19/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, Massachusetts, 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/19/cdd/12/12/1895-2025/data.json
L2  - https://invokely.ai/en/cooling-degree-days/massachusetts
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/cooling-degree-days/massachusetts.
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/19/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
ER  -

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Questions

What is the cooling degree days in Massachusetts?

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 Massachusetts?

712 degree days (base 65°F) in 2018, the highest value since 1895 in this series.

Cooling degree days elsewhere in United States

Related statistics for Massachusetts

All statistics for Massachusetts | Massachusetts in figures