Every January in Deer Lodge, MT from 1893 to 2026, 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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| 2026 | 27.6 | 11 | 39.4 | 9 | 15.8 | 18 | 0.07 | 80 | 1 |
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| 2025 | 18.9 | 67 | 28.9 | 76 | 8.6 | 64 | | | 1 |
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| 2024 | | | | | | | | | 4 |
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| 2023 | 21.8 | 54 | 32.2 | 58 | 11.4 | 51 | 1.21 | 5 | 0 |
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| 2022 | 19.6 | 64 | 32.2 | 58 | 7 | 73 | 0.42 | 39 | 0 |
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| 2021 | 25.8 | 21 | 37.1 | 22 | 14.5 | 24 | 0.31 | 49 | 0 |
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| 2020 | 25.7 | 25 | 37.7 | 17 | 13.8 | 29 | 0.25 | 58 | 0 |
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| 2019 | 19.9 | 61 | 33.1 | 50 | 6.6 | 76 | 0.48 | 36 | 0 |
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| 2018 | 24.8 | 29 | 33.3 | 47 | 16.2 | 16 | | | 0 |
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| 2017 | 12.5 | 89 | 24.8 | 91 | -1.5 | 93 | | | 2 |
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| 2016 | 22.6 | 45 | 33.1 | 50 | 11.6 | 48 | | | 1 |
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| 2015 | 26.6 | 15 | 37.8 | 16 | 15.1 | 21 | | | 2 |
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| 2014 | 25.2 | 28 | 38.1 | 13 | 12.3 | 45 | | | 0 |
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| 2010 | 23.8 | 38 | 34.6 | 37 | 13 | 36 | | | 0 |
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| 2009 | 23.9 | 35 | 35.3 | 32 | 12.5 | 43 | | | 0 |
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| 2008 | 16.7 | 78 | 30.6 | 69 | 3.2 | 86 | | | 2 |
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| 2007 | | | | | | | | | 7 |
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| 2006 | 31.8 | 3 | 42.8 | 3 | 21.4 | 3 | 0.25 | 58 | 3 |
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| 2005 | | | | | 9.1 | 61 | 0.51 | 34 | 5 |
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| 2004 | | | | | | | | | 17 |
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| 2003 | | | | | | | | | 16 |
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| 2002 | | | | | | | | | 13 |
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| 2001 | | | | | | | | | 15 |
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| 2000 | | | | | | | | | 13 |
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| 1999 | | | | | | | | | 11 |
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| 1997 | 17.3 | 74 | 29.9 | 72 | 4.2 | 82 | | | 2 |
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| 1996 | 16.5 | 79 | 28.7 | 77 | 5.1 | 78 | | | 1 |
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| 1995 | 22 | 53 | 36.2 | 28 | 8 | 68 | 0.03 | 86 | 2 |
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| 1994 | 31.3 | 4 | 43.2 | 1 | 19.4 | 4 | 0.02 | 87 | 0 |
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| 1993 | 13.6 | 87 | 26.9 | 86 | 0.6 | 90 | | | 1 |
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| 1992 | 23.8 | 38 | 37 | 23 | 10.7 | 53 | 0.06 | 81 | 1 |
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| 1991 | 18.9 | 67 | 32.6 | 56 | 5.1 | 78 | 0.23 | 62 | 3 |
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| 1990 | 27.1 | 13 | 37 | 23 | 17.2 | 9 | 0.09 | 76 | 0 |
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| 1989 | 22.5 | 49 | 33.4 | 46 | 10.9 | 52 | 0.18 | 68 | 1 |
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| 1988 | | | 27.9 | 82 | | | | | 5 |
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| 1987 | | | | | | | 0.04 | 84 | 7 |
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| 1986 | 25.9 | 20 | 38.2 | 12 | 12.7 | 40 | 0.02 | 87 | 3 |
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| 1985 | | | | | | | 0.08 | 77 | 6 |
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| 1984 | 22.7 | 44 | 32.7 | 55 | 12.6 | 41 | 0.42 | 39 | 3 |
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| 1983 | 29 | 7 | 40.9 | 6 | 17 | 10 | 0.27 | 54 | 0 |
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| 1982 | 20 | 59 | 30.9 | 68 | 9.5 | 59 | 0.89 | 10 | 2 |
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| 1981 | 29.4 | 5 | 41.1 | 5 | 17.6 | 8 | 0.08 | 77 | 0 |
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| 1980 | 16.2 | 81 | 29.2 | 74 | 3.8 | 84 | 0.72 | 18 | 1 |
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| 1979 | 3.9 | 94 | 17.8 | 97 | -10 | 98 | 0.45 | 38 | 0 |
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| 1978 | 22.2 | 51 | 32.9 | 53 | 11.5 | 50 | 0.54 | 30 | 0 |
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| 1977 | 17 | 77 | 30.2 | 71 | 3.9 | 83 | 0.57 | 26 | 0 |
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| 1976 | 25.3 | 26 | 37.2 | 21 | 13.4 | 32 | 0.35 | 47 | 0 |
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| 1975 | 19.8 | 63 | 31.7 | 64 | 7.8 | 70 | 1.14 | 8 | 0 |
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| 1974 | 18 | 73 | 27.8 | 83 | 8.3 | 65 | 0.31 | 49 | 0 |
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| 1973 | 19.3 | 65 | 30.5 | 70 | 8.1 | 67 | 0.14 | 72 | 0 |
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| 1972 | 18.1 | 71 | 28.2 | 79 | 8 | 68 | 0.56 | 27 | 0 |
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| 1971 | 24.6 | 31 | 34.2 | 40 | 15 | 22 | 0.68 | 20 | 0 |
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| 1970 | 22.8 | 43 | 32.6 | 56 | 12.9 | 39 | 0.58 | 24 | 0 |
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| 1969 | 17.3 | 74 | 27.2 | 85 | 7.4 | 71 | 1.67 | 2 | 0 |
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| 1968 | 19.3 | 65 | 31.8 | 62 | 6.8 | 75 | 0.22 | 63 | 0 |
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| 1967 | 28.2 | 8 | 37.4 | 20 | 19 | 5 | 0.42 | 39 | 0 |
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| 1966 | 24.1 | 34 | 33.9 | 42 | 14.4 | 25 | 0.36 | 45 | 1 |
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| 1965 | 25.8 | 21 | 34.7 | 36 | 17 | 10 | 0.61 | 21 | 1 |
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| 1964 | 22.5 | 49 | 35.1 | 33 | 9.9 | 57 | 0.31 | 49 | 0 |
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| 1963 | 8.6 | 92 | 20.3 | 95 | -3.1 | 94 | 1.27 | 4 | 0 |
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| 1962 | | | | | | | 1.17 | 7 | 6 |
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| 1961 | 25.8 | 21 | 36.4 | 26 | 15.2 | 20 | 0.20 | 66 | 0 |
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| 1960 | 15.3 | 84 | 26.8 | 87 | 3.3 | 85 | 0.25 | 58 | 3 |
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| 1959 | 25.8 | 21 | 35.6 | 30 | 15.9 | 17 | 0.30 | 52 | 0 |
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| 1958 | 26.6 | 15 | 38.1 | 13 | 15.3 | 19 | 0.22 | 63 | 1 |
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| 1957 | 6.7 | 93 | 19 | 96 | -5.5 | 96 | 0.55 | 29 | 1 |
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| 1956 | 22.6 | 45 | 33.3 | 47 | 10.6 | 54 | 0.73 | 16 | 2 |
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| 1955 | 18.6 | 69 | 28.6 | 78 | 8.9 | 63 | 0.40 | 43 | 1 |
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| 1954 | 23.6 | 41 | 33.7 | 44 | 13.5 | 30 | 0.52 | 31 | 0 |
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| 1953 | 34.8 | 1 | 43 | 2 | 26.5 | 1 | 0.75 | 15 | 0 |
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| 1952 | 19.9 | 61 | 29.7 | 73 | 10.1 | 56 | 0.11 | 74 | 0 |
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| 1951 | 16.5 | 79 | 28.2 | 79 | 4.8 | 80 | 0.16 | 71 | 0 |
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| 1950 | 12.6 | 88 | 24.7 | 92 | 0.4 | 91 | 0.73 | 16 | 0 |
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| 1949 | 1.9 | 95 | 13.4 | 98 | -9.8 | 97 | 0.58 | 24 | 1 |
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| 1948 | 23.6 | 41 | 35.5 | 31 | 11.6 | 48 | 0.27 | 54 | 0 |
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| 1947 | 20.3 | 58 | 32.1 | 60 | 8.2 | 66 | 0.18 | 68 | 1 |
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| 1946 | 28.1 | 9 | 39.5 | 8 | 16.7 | 13 | 0.05 | 82 | 0 |
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| 1945 | 26.3 | 17 | 38.7 | 10 | 13.9 | 27 | 0.14 | 72 | 0 |
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| 1944 | 25.3 | 26 | 38.1 | 13 | 12.6 | 41 | 0.02 | 87 | 2 |
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| 1943 | 14.8 | 85 | 26.7 | 88 | 2.9 | 87 | 1.21 | 5 | 0 |
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| 1942 | 11.1 | 90 | 22.5 | 94 | -0.2 | 92 | 0.70 | 19 | 0 |
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| 1941 | 24.8 | 29 | 36.4 | 26 | 13.3 | 33 | 0.17 | 70 | 0 |
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| 1940 | | | | | | | 0.90 | 9 | 6 |
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| 1939 | 28 | 10 | 37.7 | 17 | 18.3 | 6 | 0.42 | 39 | 0 |
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| 1938 | 23.9 | 35 | 34.5 | 38 | 13.2 | 34 | 0.20 | 66 | 0 |
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| 1937 | -1 | 96 | 10.5 | 99 | -12.5 | 99 | 0.28 | 53 | 0 |
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| 1936 | 24.3 | 33 | 34 | 41 | 14.4 | 25 | 0.48 | 36 | 1 |
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| 1935 | 24.4 | 32 | 35 | 34 | 13.9 | 27 | 0.52 | 31 | 1 |
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| 1934 | 32.2 | 2 | 41.2 | 4 | 23.2 | 2 | 0.08 | 77 | 1 |
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| 1933 | 22.1 | 52 | 31.8 | 62 | 12.4 | 44 | 0.26 | 56 | 0 |
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| 1932 | 18.4 | 70 | 27.7 | 84 | 9.1 | 61 | 0.22 | 63 | 0 |
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| 1931 | 27.1 | 13 | 37.5 | 19 | 16.8 | 12 | 0.26 | 56 | 0 |
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| 1929 | 10.3 | 91 | 23.7 | 93 | -3.1 | 94 | 0.59 | 23 | 0 |
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| 1924 | 20 | 59 | 31.3 | 66 | 7.1 | 72 | 0.56 | 27 | 2 |
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| 1923 | 26.3 | 17 | 36.2 | 28 | 16.5 | 15 | 0.84 | 11 | 0 |
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| 1922 | 14.1 | 86 | 25.5 | 90 | 2.7 | 88 | 0.24 | 61 | 0 |
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| 1921 | 26.3 | 17 | 38.5 | 11 | 14.6 | 23 | 0.36 | 45 | 2 |
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| 1920 | 22.6 | 45 | 33.1 | 50 | 12 | 47 | 0.51 | 34 | 0 |
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| 1919 | 21.7 | 55 | 33.5 | 45 | 9.6 | 58 | 0.01 | 90 | 1 |
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| 1918 | 20.8 | 57 | 31 | 67 | 10.5 | 55 | 0.60 | 22 | 0 |
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| 1917 | 15.5 | 83 | 25.9 | 89 | 5.4 | 77 | 1.51 | 3 | 1 |
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| 1913 | | | | | | | 0.83 | 13 | 31 |
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| 1906 | | | | | | | 0.38 | 44 | 20 |
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| 1905 | 22.6 | 45 | 31.6 | 65 | 13.5 | 30 | | | 0 |
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| 1904 | 23.7 | 40 | 34.3 | 39 | 13.2 | 34 | 0.01 | 90 | 0 |
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| 1903 | | | 33.3 | 47 | 13 | 36 | 0.05 | 82 | 4 |
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| 1902 | | | | | | | | | 22 |
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| 1900 | 29.2 | 6 | 40.1 | 7 | 18.3 | 6 | 0.04 | 84 | 0 |
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| 1899 | 23.9 | 35 | 34.8 | 35 | 13 | 36 | | | 0 |
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| 1898 | 17.3 | 74 | 28.2 | 79 | 6.9 | 74 | 0.10 | 75 | 2 |
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| 1897 | 16.1 | 82 | 29.1 | 75 | 2.4 | 89 | 0.34 | 48 | 2 |
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| 1896 | 27.5 | 12 | 37 | 23 | 16.6 | 14 | 0.52 | 31 | 2 |
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| 1895 | 18.1 | 71 | 31.9 | 61 | 4.4 | 81 | 1.81 | 1 | 1 |
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| 1894 | | | 33.8 | 43 | 12.1 | 46 | 0.83 | 13 | 6 |
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| 1893 | 21.2 | 56 | 32.9 | 53 | 9.5 | 59 | 0.84 | 11 | 0 |
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