# Cooling degree days in Montana

Cooling degree days in Montana was 237 degree days (base 65°F) in 2025. Source: NOAA National Centers for Environmental Information.

- Indicator id: `cooling_degree_days_annual`
- Place id: `us-state-30`
- 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/24/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/24/cdd/12/12/1895-2025/data.json. Retrieved 2026-10-12.
- Web page: https://invokely.ai/en/cooling-degree-days/montana
- API: https://invokely.ai/api/v1/series?indicator=cooling_degree_days_annual&place=us-state-30

| Period | degree days (base 65°F) |
|---|---:|
| 2025 | 237 |
| 2024 | 258 |
| 2023 | 235 |
| 2022 | 313 |
| 2021 | 341 |
| 2020 | 202 |
| 2019 | 147 |
| 2018 | 171 |
| 2017 | 279 |
| 2016 | 180 |
| 2015 | 228 |
| 2014 | 187 |
| 2013 | 251 |
| 2012 | 290 |
| 2011 | 203 |
| 2010 | 122 |
| 2009 | 152 |
| 2008 | 164 |
| 2007 | 326 |
| 2006 | 279 |
| 2005 | 169 |
| 2004 | 129 |
| 2003 | 312 |
| 2002 | 187 |
| 2001 | 256 |
| 2000 | 215 |
| 1999 | 151 |
| 1998 | 274 |
| 1997 | 156 |
| 1996 | 188 |
| 1995 | 129 |
| 1994 | 210 |
| 1993 | 41 |
| 1992 | 91 |
| 1991 | 225 |
| 1990 | 197 |
| 1989 | 176 |
| 1988 | 271 |
| 1987 | 128 |
| 1986 | 160 |
| 1985 | 174 |
| 1984 | 195 |
| 1983 | 204 |
| 1982 | 127 |
| 1981 | 167 |
| 1980 | 119 |
| 1979 | 170 |
| 1978 | 100 |
| 1977 | 131 |
| 1976 | 155 |
| 1975 | 142 |
| 1974 | 148 |
| 1973 | 165 |
| 1972 | 124 |
| 1971 | 197 |
| 1970 | 203 |
| 1969 | 152 |
| 1968 | 98 |
| 1967 | 195 |
| 1966 | 177 |
| 1965 | 111 |
| 1964 | 135 |
| 1963 | 178 |
| 1962 | 94 |
| 1961 | 276 |
| 1960 | 196 |
| 1959 | 143 |
| 1958 | 148 |
| 1957 | 156 |
| 1956 | 141 |
| 1955 | 153 |
| 1954 | 150 |
| 1953 | 169 |
| 1952 | 133 |
| 1951 | 97 |
| 1950 | 76 |
| 1949 | 163 |
| 1948 | 134 |
| 1947 | 169 |
| 1946 | 145 |
| 1945 | 149 |
| 1944 | 90 |
| 1943 | 140 |
| 1942 | 134 |
| 1941 | 178 |
| 1940 | 248 |
| 1939 | 182 |
| 1938 | 182 |
| 1937 | 205 |
| 1936 | 338 |
| 1935 | 171 |
| 1934 | 197 |
| 1933 | 235 |
| 1932 | 165 |
| 1931 | 228 |
| 1930 | 228 |
| 1929 | 206 |
| 1928 | 104 |
| 1927 | 93 |
| 1926 | 154 |
| 1925 | 152 |
| 1924 | 100 |
| 1923 | 175 |
| 1922 | 196 |
| 1921 | 182 |
| 1920 | 174 |
| 1919 | 259 |
| 1918 | 148 |
| 1917 | 179 |
| 1916 | 119 |
| 1915 | 92 |
| 1914 | 150 |
| 1913 | 126 |
| 1912 | 65 |
| 1911 | 80 |
| 1910 | 147 |
| 1909 | 140 |
| 1908 | 130 |
| 1907 | 69 |
| 1906 | 147 |
| 1905 | 152 |
| 1904 | 120 |
| 1903 | 86 |
| 1902 | 78 |
| 1901 | 192 |
| 1900 | 162 |
| 1899 | 111 |
| 1898 | 148 |
| 1897 | 144 |
| 1896 | 143 |
| 1895 | 88 |