# Cooling degree days in Connecticut

Cooling degree days in Connecticut was 695 degree days (base 65°F) in 2025. Source: NOAA National Centers for Environmental Information.

- Indicator id: `cooling_degree_days_annual`
- Place id: `us-state-09`
- Unit: degree days (base 65°F)
- 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).
- Note: NOAA publishes these for operational monitoring; they can differ from official degree day publications.
- Source: NOAA National Centers for Environmental Information, NOAA Climate at a Glance, January to December cooling degree days (base 65°F), contiguous US and statewide (https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/time-series/6/cdd/12/12/1895-2025/data.json)
- Publisher page: https://invokely.ai/en/publishers/noaa-ncei
- Retrieved: 2026-10-12
- License: Public domain (US government work); NCEI asks users to cite the nClimDiv dataset
- Citation: 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/6/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/cooling-degree-days/connecticut
- API: https://invokely.ai/api/v1/series?indicator=cooling_degree_days_annual&place=us-state-09

| Period | degree days (base 65°F) |
|---|---:|
| 2025 | 695 |
| 2024 | 715 |
| 2023 | 631 |
| 2022 | 774 |
| 2021 | 706 |
| 2020 | 772 |
| 2019 | 666 |
| 2018 | 822 |
| 2017 | 592 |
| 2016 | 796 |
| 2015 | 715 |
| 2014 | 529 |
| 2013 | 644 |
| 2012 | 702 |
| 2011 | 712 |
| 2010 | 786 |
| 2009 | 444 |
| 2008 | 571 |
| 2007 | 564 |
| 2006 | 599 |
| 2005 | 751 |
| 2004 | 477 |
| 2003 | 557 |
| 2002 | 619 |
| 2001 | 570 |
| 2000 | 360 |
| 1999 | 707 |
| 1998 | 582 |
| 1997 | 441 |
| 1996 | 466 |
| 1995 | 594 |
| 1994 | 631 |
| 1993 | 594 |
| 1992 | 322 |
| 1991 | 611 |
| 1990 | 527 |
| 1989 | 477 |
| 1988 | 602 |
| 1987 | 489 |
| 1986 | 371 |
| 1985 | 413 |
| 1984 | 500 |
| 1983 | 593 |
| 1982 | 371 |
| 1981 | 502 |
| 1980 | 567 |
| 1979 | 477 |
| 1978 | 402 |
| 1977 | 466 |
| 1976 | 442 |
| 1975 | 483 |
| 1974 | 435 |
| 1973 | 593 |
| 1972 | 422 |
| 1971 | 493 |
| 1970 | 505 |
| 1969 | 468 |
| 1968 | 463 |
| 1967 | 445 |
| 1966 | 486 |
| 1965 | 392 |
| 1964 | 351 |
| 1963 | 367 |
| 1962 | 293 |
| 1961 | 538 |
| 1960 | 394 |
| 1959 | 569 |
| 1958 | 357 |
| 1957 | 448 |
| 1956 | 355 |
| 1955 | 646 |
| 1954 | 338 |
| 1953 | 470 |
| 1952 | 581 |
| 1951 | 418 |
| 1950 | 344 |
| 1949 | 676 |
| 1948 | 472 |
| 1947 | 473 |
| 1946 | 324 |
| 1945 | 446 |
| 1944 | 621 |
| 1943 | 567 |
| 1942 | 439 |
| 1941 | 424 |
| 1940 | 324 |
| 1939 | 510 |
| 1938 | 482 |
| 1937 | 544 |
| 1936 | 460 |
| 1935 | 463 |
| 1934 | 509 |
| 1933 | 477 |
| 1932 | 417 |
| 1931 | 555 |
| 1930 | 512 |
| 1929 | 383 |
| 1928 | 450 |
| 1927 | 259 |
| 1926 | 345 |
| 1925 | 440 |
| 1924 | 338 |
| 1923 | 343 |
| 1922 | 407 |
| 1921 | 487 |
| 1920 | 363 |
| 1919 | 379 |
| 1918 | 376 |
| 1917 | 453 |
| 1916 | 413 |
| 1915 | 327 |
| 1914 | 320 |
| 1913 | 405 |
| 1912 | 342 |
| 1911 | 476 |
| 1910 | 387 |
| 1909 | 322 |
| 1908 | 504 |
| 1907 | 320 |
| 1906 | 472 |
| 1905 | 353 |
| 1904 | 313 |
| 1903 | 233 |
| 1902 | 244 |
| 1901 | 510 |
| 1900 | 560 |
| 1899 | 390 |
| 1898 | 497 |
| 1897 | 315 |
| 1896 | 406 |
| 1895 | 393 |