Every September in Alpena, MI from 1917 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 | 59.9 | 26 | 71.4 | 31 | 48.4 | 24 | 2.03 | 80 | 0 |
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| 2025 | 59.5 | 34 | 70.9 | 38 | 48.1 | 29 | 0.75 | 107 | 0 |
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| 2024 | 62.7 | 6 | 76.8 | 1 | 48.6 | 20 | 0.99 | 103 | 0 |
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| 2023 | 61.9 | 8 | 73.3 | 15 | 50.4 | 7 | 0.82 | 106 | 0 |
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| 2022 | 60.7 | 15 | 72.3 | 20 | 49.1 | 16 | 1.41 | 97 | 0 |
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| 2021 | 59.8 | 29 | 71.5 | 29 | 48.2 | 28 | 2.28 | 71 | 0 |
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| 2020 | 56.9 | 72 | 68.3 | 68 | 45.5 | 69 | 2.52 | 62 | 0 |
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| 2019 | 60.2 | 21 | 70.7 | 40 | 49.7 | 12 | 3.49 | 39 | 0 |
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| 2018 | 61.9 | 8 | 72.7 | 17 | 51 | 4 | 3.88 | 30 | 0 |
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| 2017 | 61.8 | 11 | 74.8 | 7 | 48.8 | 18 | 3.00 | 44 | 0 |
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| 2016 | 63.2 | 2 | 74.6 | 9 | 51.9 | 2 | 2.83 | 52 | 0 |
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| 2015 | 64.2 | 1 | 75.8 | 3 | 52.5 | 1 | 1.22 | 101 | 0 |
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| 2014 | 57.9 | 52 | 69.3 | 52 | 46.4 | 54 | 4.15 | 21 | 0 |
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| 2013 | 56.9 | 72 | 69.6 | 48 | 44.3 | 81 | 1.59 | 91 | 0 |
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| 2012 | 56.8 | 75 | 69.4 | 51 | 44.3 | 81 | 1.64 | 89 | 0 |
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| 2011 | 57.2 | 63 | 68.7 | 63 | 45.7 | 64 | 4.83 | 14 | 0 |
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| 2010 | 57 | 70 | 67.3 | 82 | 46.8 | 52 | 4.10 | 25 | 0 |
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| 2009 | 59 | 38 | 71.1 | 34 | 46.9 | 51 | 2.68 | 56 | 0 |
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| 2008 | 58.4 | 44 | 69.8 | 46 | 47 | 48 | 3.79 | 32 | 0 |
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| 2007 | 61.3 | 14 | 73.6 | 14 | 49 | 17 | 1.86 | 85 | 0 |
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| 2006 | 56.5 | 78 | 66.9 | 92 | 46 | 60 | 2.81 | 53 | 0 |
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| 2005 | 61.5 | 12 | 74.6 | 9 | 48.4 | 24 | 2.45 | 65 | 0 |
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| 2004 | 62.6 | 7 | 76.8 | 1 | 48.5 | 23 | 0.40 | 108 | 0 |
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| 2003 | 57.6 | 55 | 69 | 60 | 46.2 | 56 | 2.58 | 60 | 0 |
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| 2002 | 63.1 | 3 | 75.6 | 4 | 50.7 | 6 | 1.24 | 100 | 0 |
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| 2001 | 57.2 | 63 | 67.2 | 86 | 47.1 | 46 | 6.46 | 6 | 0 |
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| 2000 | 56.6 | 76 | 67.6 | 79 | 45.6 | 66 | 3.60 | 36 | 0 |
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| 1999 | 58.3 | 46 | 72.1 | 22 | 44.6 | 76 | 2.30 | 69 | 0 |
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| 1998 | 59.9 | 26 | 72 | 24 | 47.8 | 34 | 2.92 | 49 | 0 |
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| 1997 | 57.6 | 55 | 67.8 | 77 | 47.3 | 42 | 2.86 | 51 | 0 |
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| 1996 | 59.6 | 33 | 69.2 | 54 | 50 | 9 | 6.16 | 7 | 0 |
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| 1995 | 55.2 | 92 | 68.5 | 66 | 41.8 | 101 | 1.72 | 87 | 0 |
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| 1994 | 59.9 | 26 | 71.2 | 33 | 48.6 | 20 | 1.61 | 90 | 0 |
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| 1993 | 52.2 | 107 | 63.9 | 107 | 40.5 | 108 | 1.51 | 93 | 0 |
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| 1992 | 55.7 | 86 | 67.9 | 75 | 43.5 | 90 | 2.53 | 61 | 0 |
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| 1991 | 55.5 | 89 | 66.3 | 96 | 44.6 | 76 | 2.24 | 72 | 0 |
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| 1990 | 57.1 | 68 | 68.1 | 69 | 46 | 60 | 1.58 | 92 | 0 |
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| 1989 | 56.2 | 80 | 70 | 44 | 42.4 | 99 | 1.90 | 84 | 0 |
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| 1988 | 58 | 50 | 69.3 | 52 | 46.7 | 53 | 1.50 | 94 | 0 |
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| 1987 | 59.7 | 32 | 71.1 | 34 | 48.4 | 24 | 3.29 | 41 | 0 |
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| 1986 | 57.1 | 68 | 66.5 | 95 | 47.8 | 34 | 7.12 | 3 | 0 |
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| 1985 | 59.1 | 36 | 69.5 | 49 | 48.6 | 20 | 3.07 | 42 | 0 |
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| 1984 | 54.4 | 98 | 65.3 | 100 | 43.4 | 91 | 3.76 | 33 | 0 |
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| 1983 | 59.8 | 29 | 72.1 | 22 | 47.5 | 40 | 3.50 | 38 | 0 |
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| 1982 | 57.4 | 61 | 66.7 | 93 | 48 | 31 | 3.61 | 35 | 0 |
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| 1981 | 54.1 | 102 | 64.2 | 104 | 44 | 84 | 2.38 | 67 | 0 |
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| 1980 | 57.2 | 63 | 67 | 88 | 47.3 | 42 | 2.51 | 63 | 0 |
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| 1979 | 58.9 | 40 | 72.3 | 20 | 45.6 | 66 | 0.28 | 110 | 0 |
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| 1978 | 58.5 | 43 | 68.6 | 65 | 48.4 | 24 | 6.09 | 8 | 0 |
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| 1977 | 58.2 | 48 | 65.5 | 99 | 50.9 | 5 | 4.01 | 26 | 0 |
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| 1976 | 57 | 70 | 69.5 | 49 | 44.4 | 79 | 1.30 | 99 | 0 |
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| 1975 | 53.6 | 104 | 64.3 | 103 | 42.9 | 94 | 1.97 | 82 | 0 |
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| 1974 | 53.1 | 105 | 64.8 | 102 | 41.3 | 104 | 2.18 | 73 | 0 |
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| 1973 | 56.6 | 76 | 68 | 73 | 45.1 | 72 | 2.97 | 47 | 0 |
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| 1972 | 55.1 | 95 | 67 | 88 | 43.1 | 93 | 2.60 | 59 | 0 |
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| 1971 | 60.2 | 21 | 70.7 | 40 | 49.7 | 12 | 1.00 | 102 | 0 |
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| 1970 | 58 | 50 | 68.4 | 67 | 47.5 | 40 | 4.76 | 15 | 0 |
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| 1969 | 56.9 | 72 | 68.1 | 69 | 45.6 | 66 | 2.18 | 73 | 0 |
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| 1968 | 60.5 | 16 | 71.1 | 34 | 49.9 | 10 | 6.67 | 4 | 0 |
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| 1967 | 55.3 | 91 | 69.2 | 54 | 41.3 | 104 | 1.98 | 81 | 0 |
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| 1966 | 55.7 | 86 | 68.1 | 69 | 43.4 | 91 | 2.15 | 75 | 0 |
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| 1965 | 56.2 | 80 | 67.1 | 87 | 45.2 | 71 | 4.64 | 18 | 0 |
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| 1964 | 55.6 | 88 | 67.5 | 80 | 43.7 | 87 | 3.65 | 34 | 0 |
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| 1963 | 54.3 | 99 | 67 | 88 | 41.5 | 102 | 1.92 | 83 | 0 |
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| 1962 | 54.2 | 100 | 67 | 88 | 41.5 | 102 | 2.87 | 50 | 0 |
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| 1961 | 61.9 | 8 | 74 | 11 | 49.7 | 12 | 5.99 | 9 | 0 |
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| 1960 | 56.2 | 80 | 68.8 | 61 | 43.6 | 88 | 2.06 | 79 | 0 |
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| 1959 | 59.4 | 35 | 70.7 | 40 | 48.1 | 29 | 2.97 | 47 | 0 |
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| 1958 | | | | | | | 3.06 | 43 | 5 |
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| 1957 | 57.7 | 53 | 69.8 | 46 | 45.5 | 69 | 3.00 | 44 | 0 |
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| 1956 | 54.2 | 100 | 65.6 | 98 | 42.8 | 96 | 2.09 | 77 | 0 |
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| 1955 | 59.1 | 36 | 71.6 | 28 | 46.1 | 57 | 0.29 | 109 | 2 |
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| 1954 | 58.6 | 41 | 67.3 | 82 | 49.9 | 10 | 7.21 | 2 | 0 |
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| 1953 | 60.4 | 20 | 73.7 | 13 | 47.1 | 46 | 5.58 | 10 | 0 |
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| 1952 | 60.5 | 16 | 74 | 11 | 47 | 48 | 0.91 | 105 | 0 |
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| 1951 | 56.1 | 84 | 67.3 | 82 | 44.9 | 74 | 3.42 | 40 | 0 |
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| 1950 | 53.9 | 103 | 64.9 | 101 | 42.9 | 94 | 4.13 | 23 | 0 |
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| 1949 | 56 | 85 | 67.5 | 80 | 44.4 | 79 | 2.36 | 68 | 0 |
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| 1948 | 61.4 | 13 | 75.5 | 5 | 47.2 | 45 | 0.97 | 104 | 0 |
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| 1947 | 59.8 | 29 | 71.7 | 26 | 47.9 | 32 | 4.72 | 16 | 0 |
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| 1946 | 57.7 | 53 | 71.5 | 29 | 43.9 | 85 | 3.57 | 37 | 0 |
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| 1945 | 57.3 | 62 | 68.1 | 69 | 46.4 | 54 | 5.48 | 12 | 0 |
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| 1944 | 58.3 | 46 | 68.8 | 61 | 47.7 | 37 | 5.55 | 11 | 0 |
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| 1943 | 55.2 | 92 | 67.9 | 75 | 42.5 | 97 | 1.48 | 95 | 0 |
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| 1942 | 57.2 | 63 | 68.7 | 63 | 45.7 | 64 | 4.12 | 24 | 0 |
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| 1941 | 59 | 38 | 70.3 | 43 | 47.6 | 39 | 3.81 | 31 | 0 |
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| 1940 | 58.1 | 49 | 69.1 | 58 | 47 | 48 | 4.36 | 20 | 0 |
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| 1939 | 57.6 | 55 | 69.1 | 58 | 46 | 60 | 2.74 | 54 | 0 |
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| 1938 | 55.4 | 90 | 66.6 | 94 | 44.1 | 83 | 2.70 | 55 | 0 |
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| 1937 | 57.5 | 59 | 69.2 | 54 | 45.8 | 63 | 10.40 | 1 | 0 |
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| 1936 | 58.6 | 41 | 71 | 37 | 46.1 | 57 | 3.93 | 29 | 0 |
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| 1935 | 55.1 | 95 | 66.3 | 96 | 43.9 | 85 | 2.48 | 64 | 0 |
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| 1934 | 57.5 | 59 | 67.3 | 82 | 47.7 | 37 | 4.14 | 22 | 0 |
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| 1933 | 60.2 | 21 | 72.7 | 17 | 47.8 | 34 | 4.00 | 27 | 0 |
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| 1932 | 56.2 | 80 | 70 | 44 | 42.4 | 99 | 2.30 | 69 | 0 |
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| 1931 | 62.8 | 5 | 75.2 | 6 | 50.4 | 7 | 4.52 | 19 | 0 |
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| 1930 | 58.4 | 44 | 71.8 | 25 | 45 | 73 | 1.44 | 96 | 0 |
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| 1929 | 57.2 | 63 | 70.9 | 38 | 43.6 | 88 | 2.09 | 77 | 0 |
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| 1928 | 52.5 | 106 | 64 | 106 | 41 | 106 | 3.99 | 28 | 0 |
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| 1927 | 60.5 | 16 | 71.4 | 31 | 49.6 | 15 | 6.67 | 4 | 0 |
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| 1926 | 54.5 | 97 | 64.2 | 104 | 44.9 | 74 | 2.99 | 46 | 0 |
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| 1925 | 57.6 | 55 | 69.2 | 54 | 46.1 | 57 | 2.68 | 56 | 0 |
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| 1924 | 51.8 | 108 | 63.9 | 107 | 39.7 | 109 | 2.44 | 66 | 0 |
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| 1923 | 56.3 | 79 | 68 | 73 | 44.6 | 76 | 1.65 | 88 | 0 |
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| 1922 | 60.5 | 16 | 73.2 | 16 | 47.9 | 32 | 1.33 | 98 | 0 |
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| 1921 | 63.1 | 3 | 74.7 | 8 | 51.5 | 3 | 5.08 | 13 | 0 |
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| 1920 | 60 | 25 | 72.7 | 17 | 47.3 | 42 | 4.68 | 17 | 0 |
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| 1919 | 60.2 | 21 | 71.7 | 26 | 48.7 | 19 | 2.11 | 76 | 0 |
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| 1918 | 51.8 | 108 | 62.7 | 109 | 40.9 | 107 | 2.64 | 58 | 0 |
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| 1917 | 55.2 | 92 | 67.8 | 77 | 42.5 | 97 | 1.78 | 86 | 0 |
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