Every December in Deer Lodge, MT from 1893 to 2025, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.
| Year | Mean, °F | Rank | High, °F | Rank | Low, °F | Rank | Precipitation, in | Rank | Days missing |
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| 2025 | 33.5 | 1 | 42.7 | 3 | 24.3 | 3 | 0.57 | 26 | 0 |
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| 2024 | 28.3 | 15 | 39.8 | 9 | 16.7 | 24 | 0.27 | 57 | 0 |
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| 2023 | | | | | | | 0.06 | 89 | 10 |
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| 2022 | 17.7 | 81 | 28.7 | 87 | 6.6 | 88 | 0.35 | 50 | 0 |
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| 2021 | 23 | 48 | 35 | 44 | 11 | 63 | 1.50 | 1 | 0 |
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| 2020 | 25.2 | 32 | 38.1 | 18 | 12.3 | 53 | 0.22 | 62 | 0 |
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| 2019 | 24.4 | 39 | 36 | 31 | 12.7 | 49 | 0.07 | 88 | 0 |
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| 2018 | 20.1 | 68 | 31.7 | 77 | 8.5 | 74 | 0.47 | 37 | 0 |
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| 2017 | 17 | 83 | 26.9 | 93 | 7.2 | 84 | | | 0 |
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| 2016 | | | | | | | | | 13 |
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| 2015 | | | | | | | | | 4 |
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| 2014 | 22.9 | 50 | 33.6 | 56 | 12.2 | 54 | | | 0 |
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| 2013 | 19 | 77 | 29.1 | 85 | 8.9 | 73 | | | 0 |
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| 2010 | | | 31.4 | 79 | | | | | 4 |
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| 2009 | 13.7 | 91 | 25.8 | 97 | 0.6 | 99 | 0.08 | 86 | 3 |
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| 2008 | | | 28 | 88 | | | | | 5 |
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| 2007 | 23.1 | 46 | 33.9 | 53 | 12.7 | 49 | 0.06 | 89 | 3 |
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| 2006 | | | 35.7 | 33 | 14.9 | 31 | 0.25 | 59 | 4 |
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| 2005 | | | 28 | 88 | | | | | 4 |
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| 2004 | | | 41 | 7 | 15.7 | 29 | 0.55 | 28 | 4 |
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| 2003 | | | | | | | | | 12 |
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| 2002 | | | | | | | 0.12 | 74 | 12 |
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| 2001 | | | | | | | 0.56 | 27 | 15 |
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| 2000 | | | | | | | | | 11 |
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| 1999 | | | | | | | | | 12 |
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| 1998 | | | | | | | | | 10 |
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| 1997 | 22.7 | 53 | 34.9 | 45 | 10.5 | 67 | 0.00 | 98 | 0 |
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| 1996 | | | 31.9 | 74 | 6.4 | 89 | 1.25 | 2 | 4 |
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| 1995 | 23.8 | 42 | 35.2 | 40 | 12.5 | 52 | 0.22 | 62 | 1 |
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| 1994 | 24.8 | 35 | 38 | 19 | 11.5 | 60 | 0.16 | 71 | 0 |
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| 1993 | 25.6 | 27 | 37 | 24 | 14.1 | 38 | 0.09 | 85 | 2 |
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| 1992 | 15.3 | 85 | 29.5 | 83 | 1 | 98 | 0.21 | 66 | 1 |
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| 1991 | 23.4 | 44 | 35.7 | 33 | 11.6 | 59 | 0.11 | 78 | 2 |
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| 1990 | 13.8 | 89 | 27.3 | 92 | -1.1 | 100 | | | 1 |
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| 1989 | 20.1 | 68 | 32 | 73 | 8.3 | 75 | 0.17 | 70 | 0 |
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| 1988 | 19.7 | 73 | 32.5 | 63 | 6.9 | 86 | | | 0 |
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| 1987 | 19.6 | 74 | 32.5 | 63 | 7.8 | 79 | trace | 96 | 3 |
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| 1986 | 19.8 | 72 | 32.1 | 71 | 7.6 | 81 | 0.11 | 78 | 1 |
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| 1985 | 14.8 | 86 | 26.9 | 93 | 2.8 | 95 | 0.12 | 74 | 2 |
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| 1984 | | | | | | | 0.04 | 92 | 9 |
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| 1983 | 9.8 | 93 | 21.4 | 101 | -2.8 | 101 | 0.32 | 53 | 2 |
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| 1982 | 21.2 | 62 | 32.2 | 69 | 10.1 | 69 | 0.52 | 33 | 1 |
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| 1981 | 26.2 | 24 | 35.9 | 32 | 16.7 | 24 | 0.35 | 50 | 1 |
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| 1980 | 31 | 6 | 42.8 | 1 | 19.1 | 11 | 0.49 | 35 | 0 |
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| 1979 | 30.8 | 7 | 42.5 | 4 | 19.1 | 11 | 0.34 | 52 | 0 |
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| 1978 | 14.1 | 87 | 25.9 | 96 | 2.3 | 97 | 0.85 | 15 | 0 |
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| 1977 | 23.6 | 43 | 33.4 | 58 | 13.7 | 39 | 1.09 | 6 | 0 |
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| 1976 | 26.2 | 24 | 38.5 | 15 | 13.7 | 39 | 0.10 | 84 | 1 |
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| 1975 | 25.6 | 27 | 36.6 | 25 | 14.6 | 33 | 0.58 | 24 | 0 |
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| 1974 | 25 | 34 | 36.4 | 29 | 13.7 | 39 | 0.20 | 67 | 1 |
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| 1973 | 28.2 | 16 | 37.3 | 21 | 19 | 13 | 0.98 | 10 | 0 |
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| 1972 | 15.4 | 84 | 26 | 95 | 4.8 | 92 | 0.55 | 28 | 0 |
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| 1971 | 18.3 | 79 | 29.5 | 83 | 7.1 | 85 | 0.59 | 23 | 0 |
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| 1970 | 21.9 | 58 | 33 | 60 | 10.8 | 65 | 0.45 | 41 | 0 |
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| 1969 | 25.6 | 27 | 36.6 | 25 | 14.6 | 33 | 0.25 | 59 | 0 |
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| 1968 | 22.5 | 54 | 31.5 | 78 | 13.6 | 42 | 0.25 | 59 | 0 |
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| 1967 | 17.8 | 80 | 27.9 | 90 | 7.7 | 80 | 1.03 | 8 | 0 |
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| 1966 | 26 | 26 | 35.2 | 40 | 16.7 | 24 | 0.22 | 62 | 0 |
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| 1965 | 25.5 | 30 | 36.6 | 25 | 14.4 | 36 | 0.41 | 44 | 0 |
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| 1964 | 21.9 | 58 | 32.4 | 65 | 11.5 | 60 | 0.61 | 20 | 0 |
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| 1963 | 20.7 | 66 | 34.2 | 50 | 7.3 | 83 | 0.40 | 46 | 0 |
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| 1962 | 29.8 | 8 | 38.9 | 12 | 20.6 | 7 | 0.30 | 56 | 0 |
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| 1961 | 20.6 | 67 | 30.3 | 81 | 11 | 63 | 0.47 | 37 | 0 |
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| 1960 | 21.5 | 61 | 31.8 | 76 | 11.2 | 62 | 0.48 | 36 | 0 |
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| 1959 | | | | | 14.4 | 36 | 0.12 | 74 | 7 |
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| 1958 | 28.5 | 13 | 38.4 | 17 | 18.6 | 14 | 0.61 | 20 | 0 |
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| 1957 | 31.8 | 5 | 42.1 | 6 | 21.5 | 6 | 0.12 | 74 | 1 |
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| 1956 | 28.7 | 12 | 39.2 | 11 | 18.1 | 19 | 0.44 | 42 | 1 |
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| 1955 | 22.8 | 52 | 32.1 | 71 | 13.6 | 42 | | | 0 |
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| 1954 | 24.3 | 40 | 35.6 | 37 | 13.3 | 46 | 0.11 | 78 | 1 |
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| 1953 | 29 | 10 | 38.5 | 15 | 19.5 | 9 | 0.18 | 69 | 0 |
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| 1952 | 23.4 | 44 | 33.6 | 56 | 13.2 | 47 | 0.41 | 44 | 0 |
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| 1951 | 18.8 | 78 | 27.9 | 90 | 9.3 | 72 | 0.80 | 17 | 2 |
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| 1950 | 27.5 | 18 | 37.7 | 20 | 17.2 | 22 | 0.54 | 30 | 0 |
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| 1949 | 22.3 | 56 | 34.1 | 52 | 10.5 | 67 | 0.31 | 55 | 0 |
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| 1948 | 13.9 | 88 | 24 | 99 | 3.9 | 93 | 1.14 | 4 | 0 |
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| 1947 | 24.8 | 35 | 36.2 | 30 | 13.4 | 44 | 0.42 | 43 | 0 |
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| 1946 | 29 | 10 | 38.8 | 13 | 18.2 | 18 | 0.37 | 48 | 1 |
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| 1945 | 23.1 | 46 | 34.2 | 50 | 12.1 | 56 | 0.67 | 18 | 0 |
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| 1944 | 19.9 | 71 | 32.8 | 62 | 6.9 | 86 | 0.32 | 53 | 0 |
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| 1943 | 22.9 | 50 | 35.1 | 42 | 10.7 | 66 | 0.14 | 73 | 0 |
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| 1942 | 27.2 | 19 | 36.5 | 28 | 17.8 | 20 | 1.00 | 9 | 0 |
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| 1941 | 25.4 | 31 | 34.6 | 47 | 16.1 | 27 | 0.54 | 30 | 0 |
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| 1940 | 28.4 | 14 | 38.6 | 14 | 18.3 | 17 | 0.08 | 86 | 0 |
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| 1939 | 33.4 | 2 | 42.8 | 1 | 24 | 4 | 0.58 | 24 | 0 |
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| 1938 | 27.1 | 21 | 37.1 | 22 | 17.2 | 22 | 0.02 | 95 | 1 |
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| 1937 | 27.2 | 19 | 35.3 | 39 | 19.2 | 10 | 0.53 | 32 | 0 |
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| 1936 | 27.8 | 17 | 37.1 | 22 | 18.5 | 16 | 0.11 | 78 | 0 |
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| 1935 | 24.8 | 35 | 34.8 | 46 | 14.8 | 32 | 0.03 | 93 | 0 |
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| 1934 | 24.5 | 38 | 33 | 60 | 16.1 | 27 | 0.46 | 40 | 0 |
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| 1933 | 32.7 | 3 | 41 | 7 | 24.4 | 2 | 0.39 | 47 | 0 |
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| 1932 | 13.6 | 92 | 24 | 99 | 3.3 | 94 | 0.36 | 49 | 0 |
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| 1931 | 21.9 | 58 | 32.2 | 69 | 11.7 | 58 | 0.15 | 72 | 0 |
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| 1930 | 22.1 | 57 | 32.4 | 65 | 11.8 | 57 | 0.03 | 93 | 0 |
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| 1929 | 29.6 | 9 | 39.4 | 10 | 19.9 | 8 | 0.92 | 11 | 0 |
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| 1928 | 20 | 70 | 32.3 | 68 | 7.5 | 82 | 0.47 | 37 | 1 |
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| 1923 | | | | | | | | | 17 |
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| 1922 | 19.1 | 76 | 29.8 | 82 | 7.9 | 77 | 0.52 | 33 | 3 |
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| 1921 | 19.2 | 75 | 30.4 | 80 | 8.1 | 76 | 0.83 | 16 | 0 |
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| 1920 | 26.6 | 23 | 35.7 | 33 | 17.7 | 21 | 0.90 | 12 | 1 |
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| 1919 | | | 35.5 | 38 | 5.2 | 91 | 0.87 | 13 | 4 |
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| 1918 | 21.1 | 63 | 33.9 | 53 | 10 | 70 | trace | 96 | 2 |
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| 1917 | 32.5 | 4 | 42.2 | 5 | 23 | 5 | 1.10 | 5 | 1 |
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| 1916 | 13.8 | 89 | 25.1 | 98 | 2.4 | 96 | 1.15 | 3 | 0 |
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| 1912 | | | | | | | 0.65 | 19 | 31 |
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| 1905 | | | | | | | 0.27 | 57 | 6 |
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| 1904 | 25.1 | 33 | 35.1 | 42 | 15.1 | 30 | | | 1 |
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| 1903 | 23 | 48 | 33.1 | 59 | 12.8 | 48 | 0.11 | 78 | 1 |
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| 1902 | 23.9 | 41 | 34.5 | 48 | 13.4 | 44 | 0.06 | 89 | 1 |
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| 1901 | | | | | 12.2 | 54 | 1.09 | 6 | 31 |
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| 1899 | | | 34.5 | 48 | 14.5 | 35 | | | 4 |
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| 1898 | 17.7 | 81 | 29.1 | 85 | 6.2 | 90 | | | 0 |
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| 1897 | 22.5 | 54 | 32.4 | 65 | 12.6 | 51 | 0.61 | 20 | 0 |
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| 1896 | | | | | 26.4 | 1 | 0.22 | 62 | 9 |
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| 1895 | 20.9 | 64 | 31.9 | 74 | 10 | 70 | 0.11 | 78 | 1 |
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| 1894 | 20.8 | 65 | 33.7 | 55 | 7.9 | 77 | 0.20 | 67 | 0 |
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| 1893 | 27.1 | 21 | 35.7 | 33 | 18.6 | 14 | 0.87 | 13 | 0 |
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