Every May 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 | 50.9 | 26 | 67.3 | 20 | 34.5 | 41 | 2.05 | 27 | 0 |
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| 2025 | 51.2 | 20 | 67.3 | 20 | 35.2 | 34 | 2.43 | 20 | 0 |
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| 2024 | 45.9 | 83 | 59.7 | 86 | 32 | 76 | 1.40 | 52 | 0 |
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| 2023 | 53.5 | 7 | 68.8 | 10 | 38.2 | 9 | 2.20 | 24 | 0 |
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| 2022 | 44.8 | 91 | 58.7 | 91 | 30.9 | 89 | 0.84 | 75 | 0 |
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| 2021 | 44.9 | 90 | 59.9 | 83 | 30.5 | 92 | 1.26 | 59 | 2 |
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| 2020 | 48.7 | 47 | 62.2 | 56 | 35.3 | 30 | 3.12 | 6 | 0 |
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| 2019 | 46.8 | 69 | 59.6 | 87 | 34.1 | 46 | 1.84 | 36 | 0 |
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| 2017 | 48.7 | 47 | 63.3 | 52 | 34.1 | 46 | | | 0 |
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| 2016 | | | | | | | | | 12 |
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| 2015 | 48.6 | 51 | 61.3 | 67 | 35.9 | 26 | | | 0 |
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| 2014 | 48.1 | 56 | 65.4 | 33 | 30.8 | 90 | | | 0 |
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| 2013 | 48.9 | 43 | 64.1 | 46 | 33.7 | 54 | | | 0 |
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| 2010 | 43.7 | 96 | 56.9 | 95 | 29.7 | 95 | | | 1 |
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| 2009 | 47.7 | 58 | 64.2 | 45 | 31.4 | 81 | | | 3 |
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| 2008 | | | | | | | | | 5 |
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| 2007 | 49.5 | 38 | 66.6 | 26 | 32.5 | 69 | 2.91 | 8 | 1 |
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| 2006 | 51.1 | 23 | 68.5 | 12 | 33.7 | 54 | | | 1 |
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| 2005 | 47.5 | 62 | 61.8 | 63 | 33.2 | 60 | 2.68 | 12 | 0 |
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| 2004 | 48.1 | 56 | 61.9 | 61 | 34.4 | 42 | 2.20 | 24 | 1 |
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| 2003 | | | | | | | | | 13 |
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| 2002 | | | | | | | | | 11 |
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| 2001 | | | | | | | | | 15 |
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| 2000 | | | | | | | | | 11 |
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| 1999 | | | | | | | | | 25 |
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| 1997 | 44.3 | 93 | 60.7 | 72 | 27.9 | 99 | 2.51 | 17 | 0 |
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| 1996 | 45.2 | 87 | 58 | 93 | 32.4 | 71 | 1.86 | 33 | 0 |
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| 1995 | 46.3 | 76 | 60.6 | 75 | 32 | 76 | 1.36 | 55 | 0 |
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| 1994 | 51 | 24 | 67.2 | 23 | 34.7 | 39 | 2.30 | 21 | 0 |
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| 1993 | 52.2 | 12 | 69.5 | 8 | 34.9 | 35 | 1.36 | 55 | 0 |
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| 1991 | 47.7 | 58 | 62.5 | 54 | 33 | 62 | 2.23 | 22 | 0 |
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| 1990 | 45.3 | 85 | 59.2 | 90 | 31.3 | 82 | 1.82 | 37 | 0 |
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| 1989 | 46.4 | 74 | 60.2 | 80 | 32.6 | 66 | 0.85 | 74 | 0 |
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| 1988 | 48.5 | 53 | 64.4 | 42 | 32.6 | 66 | 2.52 | 15 | 0 |
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| 1987 | 50.3 | 33 | 65.8 | 29 | 34.9 | 35 | 1.51 | 47 | 0 |
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| 1986 | | | | | | | | | 6 |
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| 1985 | 49.3 | 39 | 67.1 | 24 | 31.5 | 80 | 1.54 | 46 | 0 |
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| 1984 | | | | | | | 0.63 | 82 | 4 |
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| 1983 | | | | | | | | | 20 |
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| 1982 | 46.2 | 78 | 62 | 59 | 30.3 | 94 | 2.69 | 11 | 1 |
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| 1981 | 48.3 | 55 | 60.7 | 72 | 35.9 | 26 | 3.95 | 3 | 0 |
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| 1980 | 50.9 | 26 | 65.8 | 29 | 36 | 24 | 5.90 | 1 | 0 |
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| 1979 | 48.6 | 51 | 65.3 | 35 | 31.9 | 79 | 0.44 | 89 | 0 |
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| 1978 | 46 | 82 | 57.6 | 94 | 34.3 | 44 | 2.67 | 13 | 0 |
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| 1977 | 47.6 | 61 | 62 | 59 | 33.2 | 60 | 2.12 | 26 | 0 |
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| 1976 | 51.2 | 20 | 68.6 | 11 | 33.8 | 50 | 2.21 | 23 | 0 |
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| 1975 | 44.4 | 92 | 56.9 | 95 | 32 | 76 | 1.85 | 35 | 1 |
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| 1974 | 44 | 94 | 56.8 | 97 | 31.1 | 84 | 1.35 | 57 | 0 |
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| 1973 | 48.7 | 47 | 65.3 | 35 | 32.2 | 73 | 0.97 | 69 | 0 |
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| 1972 | 47.5 | 62 | 62.1 | 58 | 32.8 | 64 | 1.41 | 51 | 0 |
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| 1971 | 49.8 | 36 | 65.5 | 32 | 34.1 | 46 | 1.15 | 62 | 0 |
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| 1970 | 49 | 42 | 64.3 | 43 | 33.6 | 56 | 1.25 | 60 | 0 |
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| 1969 | 51 | 24 | 67.8 | 17 | 34.2 | 45 | 1.00 | 66 | 0 |
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| 1968 | 45.2 | 87 | 60 | 82 | 30.5 | 92 | 1.08 | 64 | 0 |
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| 1967 | 46.2 | 78 | 61.4 | 66 | 31 | 87 | 1.64 | 41 | 1 |
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| 1966 | 51.7 | 17 | 70 | 6 | 33.5 | 58 | 0.40 | 90 | 0 |
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| 1965 | 45.3 | 85 | 59.4 | 89 | 31.1 | 84 | 2.52 | 15 | 1 |
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| 1964 | 47.5 | 62 | 63 | 53 | 32.1 | 75 | 1.87 | 32 | 0 |
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| 1963 | 50.4 | 31 | 64.6 | 40 | 36.1 | 21 | 0.91 | 72 | 0 |
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| 1962 | 48.7 | 47 | 61.3 | 67 | 36.1 | 21 | 2.44 | 18 | 0 |
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| 1961 | 50.5 | 30 | 67 | 25 | 33.8 | 50 | 1.89 | 30 | 2 |
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| 1960 | 46.6 | 71 | 62.2 | 56 | 31.1 | 84 | 1.28 | 58 | 0 |
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| 1959 | 45 | 89 | 60.5 | 76 | 29.6 | 96 | 2.00 | 29 | 0 |
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| 1958 | 56.2 | 3 | 74 | 2 | 38.5 | 5 | 0.98 | 67 | 2 |
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| 1957 | 53.8 | 6 | 67.4 | 19 | 40.1 | 2 | 3.06 | 7 | 0 |
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| 1956 | 52.7 | 10 | 66.1 | 28 | 39.4 | 4 | 1.38 | 53 | 0 |
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| 1955 | 47.3 | 67 | 61 | 69 | 33.6 | 56 | 0.97 | 69 | 0 |
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| 1954 | 50.8 | 28 | 66.3 | 27 | 35.3 | 30 | 0.51 | 86 | 0 |
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| 1953 | 46.2 | 78 | 59.8 | 84 | 32.6 | 66 | 1.88 | 31 | 0 |
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| 1952 | 51.9 | 15 | 65.4 | 33 | 38.5 | 5 | 1.62 | 43 | 0 |
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| 1951 | 50.6 | 29 | 64.5 | 41 | 36.6 | 16 | 0.91 | 72 | 0 |
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| 1950 | 46.6 | 71 | 60.3 | 78 | 32.8 | 64 | 1.12 | 63 | 0 |
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| 1949 | 53.4 | 8 | 68.3 | 16 | 38.5 | 5 | 1.42 | 49 | 0 |
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| 1948 | 50.4 | 31 | 65.1 | 38 | 36.2 | 20 | 2.04 | 28 | 1 |
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| 1947 | 53.9 | 5 | 70.6 | 5 | 37.2 | 11 | 0.66 | 80 | 0 |
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| 1946 | 50 | 34 | 65.1 | 38 | 34.9 | 35 | 1.38 | 53 | 0 |
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| 1945 | 51.2 | 20 | 65.8 | 29 | 36.5 | 17 | 1.86 | 33 | 0 |
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| 1944 | 51.5 | 19 | 67.7 | 18 | 35.3 | 30 | 2.90 | 9 | 0 |
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| 1943 | 47.1 | 68 | 59.8 | 84 | 34.4 | 42 | 1.42 | 49 | 0 |
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| 1942 | 48.4 | 54 | 60.7 | 72 | 36 | 24 | 3.66 | 5 | 0 |
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| 1941 | 52 | 13 | 67.3 | 20 | 36.7 | 15 | 0.45 | 88 | 1 |
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| 1940 | 54 | 4 | 71 | 4 | 37.1 | 12 | 0.31 | 91 | 0 |
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| 1939 | 53.4 | 8 | 68.5 | 12 | 38.3 | 8 | 2.44 | 18 | 0 |
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| 1938 | 48.8 | 46 | 60.9 | 71 | 36.8 | 14 | 5.14 | 2 | 0 |
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| 1937 | 50 | 34 | 63.7 | 48 | 36.3 | 18 | 0.67 | 79 | 0 |
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| 1936 | 56.4 | 2 | 72.5 | 3 | 40.2 | 1 | 0.57 | 83 | 0 |
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| 1935 | 47.4 | 66 | 61.7 | 64 | 33 | 62 | 0.93 | 71 | 0 |
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| 1934 | 57 | 1 | 74.5 | 1 | 39.6 | 3 | 0.55 | 84 | 0 |
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| 1933 | 46.5 | 73 | 59.5 | 88 | 33.5 | 58 | 1.79 | 38 | 0 |
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| 1932 | 51.6 | 18 | 65.3 | 35 | 38 | 10 | 1.49 | 48 | 0 |
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| 1931 | 52 | 13 | 68.4 | 14 | 35.6 | 28 | 0.53 | 85 | 0 |
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| 1929 | 47.5 | 62 | 64 | 47 | 31 | 87 | 0.75 | 77 | 0 |
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| 1924 | 51.8 | 16 | 69.5 | 8 | 34.1 | 46 | 1.04 | 65 | 0 |
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| 1923 | 49.1 | 41 | 63.7 | 48 | 34.6 | 40 | 1.73 | 39 | 0 |
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| 1922 | 49.8 | 36 | 63.5 | 51 | 36.1 | 21 | 2.90 | 9 | 1 |
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| 1921 | | | | | | | 3.71 | 4 | 6 |
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| 1920 | 47.7 | 58 | 61.6 | 65 | 33.8 | 50 | 1.67 | 40 | 0 |
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| 1919 | 52.6 | 11 | 69.9 | 7 | 35.3 | 30 | 0.81 | 76 | 0 |
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| 1918 | 45.5 | 84 | 60.2 | 80 | 30.8 | 90 | 0.48 | 87 | 0 |
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| 1917 | 46.7 | 70 | 61 | 69 | 32.5 | 69 | 1.64 | 41 | 1 |
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| 1916 | 43.9 | 95 | 58.4 | 92 | 29.4 | 97 | 1.55 | 45 | 1 |
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| 1913 | | | | | | | 1.18 | 61 | 31 |
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| 1905 | | | | | 33.8 | 50 | | | 15 |
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| 1904 | 48.9 | 43 | 62.3 | 55 | 35.4 | 29 | | | 0 |
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| 1903 | 46.4 | 74 | 60.5 | 76 | 32.3 | 72 | 0.04 | 92 | 1 |
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| 1902 | | | 64.3 | 43 | 37 | 13 | | | 4 |
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| 1899 | 46.2 | 78 | 61.9 | 61 | 31.3 | 82 | | | 2 |
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| 1898 | | | | | 36.3 | 18 | 2.56 | 14 | 31 |
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| 1897 | | | | | | | 0.70 | 78 | 31 |
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| 1896 | 46.3 | 76 | 60.3 | 78 | 32.2 | 73 | 1.62 | 43 | 0 |
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| 1895 | 48.9 | 43 | 68.4 | 14 | 29.4 | 97 | 0.64 | 81 | 0 |
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| 1893 | 49.2 | 40 | 63.6 | 50 | 34.8 | 38 | 0.98 | 67 | 0 |
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