Every 1 to 9 October in Portland, ME from 1871 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 | 56.6 | 26 | 67.4 | 14 | 45.8 | 51 | 0.08 | 132 | 0 |
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| 2025 | 58.6 | 5 | 71.1 | 2 | 46 | 48 | 0.35 | 108 | 0 |
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| 2024 | 54.1 | 61 | 63.1 | 68 | 45.1 | 60 | 0.56 | 91 | 0 |
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| 2023 | 60.1 | 3 | 68.7 | 9 | 51.6 | 5 | 0.37 | 105 | 0 |
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| 2022 | 51.3 | 108 | 61.2 | 100 | 41.4 | 111 | 0.16 | 122 | 0 |
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| 2021 | 55.6 | 43 | 63.3 | 66 | 47.8 | 31 | 0.09 | 130 | 0 |
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| 2020 | 53.4 | 73 | 64 | 51 | 42.9 | 92 | 0.18 | 118 | 0 |
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| 2019 | 52.9 | 81 | 62 | 85 | 43.9 | 77 | 1.00 | 58 | 0 |
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| 2018 | 55.7 | 38 | 62.3 | 81 | 49 | 21 | 1.47 | 32 | 0 |
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| 2017 | 58.6 | 5 | 69.2 | 5 | 47.9 | 30 | 0.61 | 84 | 0 |
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| 2016 | 54.8 | 51 | 64.6 | 42 | 45.1 | 60 | 1.16 | 48 | 0 |
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| 2015 | 51.5 | 101 | 61.3 | 97 | 41.7 | 108 | 0.43 | 102 | 0 |
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| 2014 | 56.8 | 23 | 64.8 | 39 | 48.9 | 22 | 0.35 | 108 | 0 |
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| 2013 | 56.9 | 21 | 67.3 | 15 | 46.4 | 46 | 0.51 | 94 | 0 |
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| 2012 | 56.7 | 24 | 64 | 51 | 49.3 | 15 | 0.94 | 66 | 0 |
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| 2011 | 55.4 | 48 | 65.1 | 35 | 45.7 | 53 | 2.60 | 14 | 0 |
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| 2010 | 54.6 | 54 | 62.9 | 75 | 46.3 | 47 | 2.32 | 15 | 0 |
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| 2009 | 53.4 | 73 | 61.2 | 100 | 45.6 | 54 | 2.74 | 12 | 0 |
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| 2008 | 52.6 | 86 | 63 | 72 | 42.2 | 101 | 0.49 | 95 | 0 |
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| 2007 | 57.9 | 13 | 66.6 | 21 | 49.2 | 17 | 0.40 | 103 | 0 |
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| 2006 | 52.7 | 84 | 64.3 | 45 | 41 | 116 | 0.17 | 121 | 0 |
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| 2005 | 57.8 | 14 | 66.9 | 16 | 48.8 | 23 | 6.23 | 2 | 0 |
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| 2004 | 51.9 | 95 | 63 | 72 | 40.9 | 120 | 0.22 | 116 | 0 |
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| 2003 | 48.6 | 140 | 59.9 | 117 | 37.3 | 140 | 0.56 | 91 | 0 |
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| 2002 | 55.9 | 34 | 66.9 | 16 | 44.9 | 64 | 0.49 | 95 | 0 |
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| 2001 | 53.9 | 65 | 66.1 | 27 | 41.8 | 107 | 0.08 | 132 | 0 |
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| 2000 | 51.1 | 112 | 61 | 103 | 41.2 | 113 | 1.12 | 50 | 0 |
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| 1999 | 47.4 | 144 | 58.1 | 130 | 36.8 | 145 | 0.61 | 84 | 0 |
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| 1998 | 49.1 | 139 | 59.7 | 118 | 38.4 | 136 | 3.02 | 10 | 0 |
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| 1997 | 51.7 | 100 | 63.1 | 68 | 40.3 | 126 | 0.61 | 84 | 0 |
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| 1996 | 46.9 | 145 | 57.2 | 137 | 36.7 | 146 | 1.40 | 34 | 0 |
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| 1995 | 54.5 | 59 | 63.6 | 59 | 45.4 | 55 | 2.03 | 18 | 0 |
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| 1994 | 49.4 | 132 | 60.4 | 111 | 38.4 | 136 | trace | 147 | 0 |
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| 1993 | 51.4 | 105 | 61.9 | 90 | 41 | 116 | 0.74 | 75 | 0 |
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| 1992 | 49.6 | 129 | 61.3 | 97 | 37.9 | 138 | 0.08 | 132 | 0 |
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| 1991 | 55.3 | 49 | 64 | 51 | 46.7 | 43 | 1.48 | 31 | 0 |
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| 1990 | 57.4 | 16 | 67.8 | 11 | 47.1 | 38 | 0.33 | 111 | 0 |
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| 1989 | 49.7 | 125 | 60.2 | 114 | 39.2 | 133 | 0.69 | 79 | 0 |
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| 1988 | 50.1 | 122 | 57.6 | 135 | 42.7 | 94 | 0.68 | 80 | 0 |
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| 1987 | 50.8 | 116 | 61.4 | 96 | 40.1 | 127 | 1.40 | 34 | 0 |
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| 1986 | 53.2 | 78 | 64.2 | 47 | 42.2 | 101 | 0.99 | 59 | 0 |
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| 1985 | 55.7 | 38 | 63.7 | 56 | 47.7 | 34 | 2.74 | 12 | 0 |
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| 1984 | 46.4 | 149 | 56.6 | 142 | 36.3 | 147 | 1.97 | 20 | 0 |
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| 1983 | 56.5 | 30 | 66.4 | 22 | 46.6 | 44 | 0.25 | 112 | 0 |
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| 1982 | 53.3 | 76 | 63.4 | 63 | 43.1 | 89 | 1.43 | 33 | 0 |
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| 1981 | 49.3 | 134 | 57.7 | 133 | 41 | 116 | 0.92 | 67 | 0 |
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| 1980 | 52.2 | 91 | 60.2 | 114 | 44.2 | 71 | 1.11 | 51 | 0 |
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| 1979 | 53.2 | 78 | 60.6 | 107 | 45.9 | 49 | 4.42 | 4 | 0 |
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| 1978 | 51.5 | 101 | 59.6 | 119 | 43.4 | 82 | 1.28 | 43 | 0 |
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| 1977 | 50.5 | 119 | 60.4 | 111 | 40.6 | 122 | 4.03 | 6 | 0 |
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| 1976 | 53.7 | 69 | 62.4 | 79 | 44.9 | 64 | 1.88 | 22 | 0 |
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| 1975 | 49.7 | 125 | 62.3 | 81 | 37.1 | 142 | 0.03 | 141 | 0 |
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| 1974 | 46.9 | 145 | 58.2 | 128 | 35.6 | 149 | 0.49 | 95 | 0 |
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| 1973 | 53.9 | 65 | 65.7 | 32 | 42.2 | 101 | 1.11 | 51 | 0 |
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| 1972 | 52.1 | 92 | 60.6 | 107 | 43.6 | 78 | 1.96 | 21 | 0 |
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| 1971 | 52.8 | 82 | 64.7 | 41 | 41 | 116 | 0.47 | 99 | 0 |
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| 1970 | 54.6 | 54 | 64.9 | 38 | 44.2 | 71 | 0.44 | 101 | 0 |
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| 1969 | 53.9 | 65 | 63.1 | 68 | 44.7 | 67 | 1.25 | 45 | 0 |
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| 1968 | 54.6 | 54 | 65.8 | 30 | 43.3 | 83 | 1.25 | 45 | 0 |
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| 1967 | 53.7 | 69 | 64.3 | 45 | 43 | 90 | 0.15 | 123 | 0 |
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| 1966 | 51.4 | 105 | 63.7 | 56 | 39.1 | 134 | 0.78 | 71 | 0 |
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| 1965 | 44.7 | 152 | 57.1 | 139 | 32.2 | 152 | 1.87 | 23 | 0 |
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| 1964 | 46.7 | 148 | 58.2 | 128 | 35.2 | 150 | 0.20 | 117 | 0 |
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| 1963 | 51.8 | 98 | 67.6 | 13 | 36.1 | 148 | 0.01 | 145 | 0 |
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| 1962 | 53.9 | 65 | 63 | 72 | 44.8 | 66 | 9.82 | 1 | 0 |
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| 1961 | 55.9 | 34 | 66.7 | 20 | 45.1 | 60 | 0.89 | 68 | 0 |
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| 1960 | 48.1 | 141 | 61.6 | 93 | 34.7 | 151 | 0.04 | 138 | 0 |
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| 1959 | 57.1 | 19 | 64.1 | 50 | 50.1 | 12 | 3.03 | 9 | 0 |
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| 1958 | 49.5 | 131 | 61.9 | 90 | 37.1 | 142 | 0.59 | 89 | 0 |
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| 1957 | 52.4 | 88 | 63.4 | 63 | 41.3 | 112 | 0.95 | 64 | 0 |
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| 1956 | 51.4 | 105 | 63.6 | 59 | 39.3 | 132 | 0.88 | 69 | 0 |
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| 1955 | 52.4 | 88 | 63.1 | 68 | 41.7 | 108 | 1.38 | 39 | 0 |
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| 1954 | 53.6 | 71 | 63.6 | 59 | 43.6 | 78 | 0.39 | 104 | 0 |
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| 1953 | 50.4 | 121 | 63.8 | 55 | 37.1 | 142 | 0.72 | 77 | 0 |
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| 1952 | 52.6 | 86 | 62.7 | 76 | 42.6 | 96 | 1.69 | 26 | 0 |
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| 1951 | 53.3 | 76 | 60.7 | 106 | 45.9 | 49 | 1.49 | 30 | 0 |
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| 1950 | 55.6 | 43 | 69.2 | 5 | 41.9 | 105 | trace | 147 | 0 |
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| 1949 | 52.8 | 82 | 64.6 | 42 | 41.1 | 115 | 0.23 | 113 | 0 |
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| 1948 | 52.1 | 92 | 64.2 | 47 | 39.9 | 128 | 1.78 | 25 | 0 |
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| 1947 | 56.6 | 26 | 70.4 | 3 | 42.7 | 94 | trace | 147 | 0 |
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| 1946 | 52.1 | 92 | 66.8 | 19 | 37.3 | 140 | 0.10 | 127 | 0 |
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| 1945 | 49.8 | 124 | 60 | 116 | 39.7 | 130 | 4.03 | 6 | 0 |
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| 1944 | 51.8 | 98 | 62.1 | 84 | 41.6 | 110 | 0.36 | 107 | 0 |
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| 1943 | 53.6 | 71 | 63.9 | 54 | 43.3 | 83 | 1.30 | 42 | 0 |
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| 1942 | 53.4 | 73 | 66.4 | 22 | 40.4 | 125 | 0.76 | 73 | 0 |
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| 1941 | 56.6 | 26 | 66.2 | 25 | 47 | 40 | 1.26 | 44 | 0 |
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| 1940 | 54.6 | 54 | 62.2 | 83 | 47 | 40 | 0.18 | 118 | 0 |
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| 1939 | 57.4 | 16 | 65 | 36 | 49.8 | 13 | 0.05 | 137 | 0 |
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| 1938 | 50.7 | 118 | 58.8 | 123 | 42.6 | 96 | trace | 147 | 0 |
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| 1937 | | | | | | | | | 4 |
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| 1936 | 54.9 | 50 | 62.7 | 76 | 47.2 | 37 | 1.11 | 51 | 0 |
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| 1935 | 47.8 | 143 | 55.9 | 146 | 39.8 | 129 | 0.08 | 132 | 0 |
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| 1934 | 51.9 | 95 | 60.3 | 113 | 43.6 | 78 | 1.18 | 47 | 0 |
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| 1933 | 54.7 | 52 | 59.6 | 119 | 49.8 | 13 | 4.66 | 3 | 0 |
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| 1932 | 58.6 | 5 | 65.6 | 34 | 51.7 | 4 | 0.23 | 113 | 0 |
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| 1931 | 60.1 | 3 | 69.3 | 4 | 50.8 | 7 | 0.02 | 143 | 0 |
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| 1930 | 53 | 80 | 60.6 | 107 | 45.4 | 55 | 0.04 | 138 | 0 |
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| 1929 | 49.6 | 129 | 57.2 | 137 | 41.9 | 105 | 2.00 | 19 | 0 |
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| 1928 | 54.1 | 61 | 63.4 | 63 | 44.7 | 67 | 0.10 | 127 | 0 |
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| 1927 | 61.5 | 2 | 68.9 | 8 | 54.1 | 2 | 1.07 | 56 | 0 |
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| 1926 | 54.7 | 52 | 61.6 | 93 | 47.8 | 31 | 0.57 | 90 | 0 |
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| 1925 | 49.7 | 125 | 56.1 | 144 | 43.2 | 86 | 0.98 | 60 | 0 |
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| 1924 | 55.8 | 37 | 65 | 36 | 46.6 | 44 | 0.09 | 130 | 0 |
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| 1923 | 52.7 | 84 | 62 | 85 | 43.3 | 83 | 0.15 | 123 | 0 |
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| 1922 | 58.1 | 11 | 65.7 | 32 | 50.6 | 9 | 1.04 | 57 | 0 |
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| 1921 | 55.7 | 38 | 64.4 | 44 | 46.9 | 42 | 0.66 | 82 | 0 |
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| 1920 | 57.3 | 18 | 65.9 | 29 | 48.7 | 24 | 0.35 | 108 | 0 |
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| 1919 | 50.5 | 119 | 57 | 141 | 44 | 76 | 1.39 | 36 | 0 |
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| 1918 | 49.3 | 134 | 57.4 | 136 | 41.2 | 113 | 0.96 | 62 | 0 |
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| 1917 | 49.2 | 137 | 56.1 | 144 | 42.3 | 99 | 0.37 | 105 | 0 |
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| 1916 | 57.1 | 19 | 69 | 7 | 45.1 | 60 | 0.06 | 136 | 0 |
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| 1915 | 51.2 | 109 | 57.1 | 139 | 45.3 | 58 | 1.16 | 48 | 0 |
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| 1914 | 56.4 | 31 | 67.7 | 12 | 45.2 | 59 | 0.00 | 152 | 0 |
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| 1913 | 58.6 | 5 | 63.2 | 67 | 54 | 3 | 1.61 | 27 | 0 |
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| 1912 | 55.6 | 43 | 65.8 | 30 | 45.4 | 55 | 0.11 | 126 | 0 |
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| 1911 | 49.3 | 134 | 58 | 131 | 40.6 | 122 | 0.68 | 80 | 0 |
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| 1910 | 56.3 | 33 | 64.2 | 47 | 48.4 | 26 | 0.45 | 100 | 0 |
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| 1909 | 58.1 | 11 | 68 | 10 | 48.2 | 27 | 0.00 | 152 | 0 |
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| 1908 | 50.8 | 116 | 58.8 | 123 | 42.9 | 92 | 0.62 | 83 | 0 |
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| 1907 | 50.1 | 122 | 57.8 | 132 | 42.3 | 99 | 1.39 | 36 | 0 |
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| 1906 | 51.2 | 109 | 59.1 | 122 | 43.2 | 86 | 1.08 | 55 | 0 |
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| 1905 | 56.9 | 21 | 66.2 | 25 | 47.6 | 35 | 0.01 | 145 | 0 |
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| 1904 | 47.9 | 142 | 55 | 149 | 40.9 | 120 | 0.14 | 125 | 0 |
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| 1903 | 55.7 | 38 | 62 | 85 | 49.3 | 15 | 0.70 | 78 | 0 |
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| 1902 | 56.4 | 31 | 62 | 85 | 50.8 | 7 | 1.50 | 29 | 0 |
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| 1901 | 51.9 | 95 | 59.6 | 119 | 44.2 | 71 | 0.95 | 64 | 0 |
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| 1900 | 56.6 | 26 | 61.6 | 93 | 51.6 | 5 | 2.09 | 17 | 0 |
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| 1899 | 46.3 | 150 | 53.2 | 151 | 39.4 | 131 | 0.23 | 113 | 0 |
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| 1898 | 57.6 | 15 | 66 | 28 | 49.1 | 19 | 0.48 | 98 | 0 |
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| 1897 | 52.3 | 90 | 62.4 | 79 | 42.2 | 101 | 0.03 | 141 | 0 |
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| 1896 | 49.2 | 137 | 53.9 | 150 | 44.4 | 69 | 0.18 | 118 | 0 |
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| 1895 | 51.5 | 101 | 60.6 | 107 | 42.4 | 98 | 0.10 | 127 | 0 |
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| 1894 | 54.1 | 61 | 61 | 103 | 47.1 | 38 | 0.96 | 62 | 0 |
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| 1893 | 55.6 | 43 | 62 | 85 | 49.1 | 19 | 0.56 | 91 | 0 |
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| 1892 | 49.7 | 125 | 56.3 | 143 | 43 | 90 | 0.73 | 76 | 0 |
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| 1891 | 55.7 | 38 | 63.7 | 56 | 47.8 | 31 | 1.32 | 40 | 0 |
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| 1890 | 54.1 | 61 | 60.8 | 105 | 47.3 | 36 | 1.32 | 40 | 0 |
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| 1889 | 51.1 | 112 | 57.7 | 133 | 44.4 | 69 | 2.16 | 16 | 0 |
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| 1888 | 45.7 | 151 | 52.2 | 152 | 39.1 | 134 | 2.90 | 11 | 0 |
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| 1887 | 55.6 | 43 | 61.9 | 90 | 49.2 | 17 | 1.09 | 54 | 0 |
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| 1886 | 50.9 | 115 | 61.3 | 97 | 40.6 | 122 | 0.02 | 143 | 0 |
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| 1885 | 49.4 | 132 | 55.7 | 148 | 43.2 | 86 | 1.39 | 36 | 0 |
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| 1884 | 55.9 | 34 | 63.6 | 59 | 48.2 | 27 | 0.60 | 87 | 0 |
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| 1883 | 46.8 | 147 | 55.9 | 146 | 37.8 | 139 | 0.76 | 73 | 0 |
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| 1882 | 58.6 | 5 | 66.9 | 16 | 50.3 | 11 | trace | 147 | 0 |
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| 1881 | 56.7 | 24 | 64.8 | 39 | 48.7 | 24 | 0.78 | 71 | 0 |
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| 1880 | 54.2 | 60 | 62.7 | 76 | 45.8 | 51 | 0.00 | 152 | 0 |
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| 1879 | 65.8 | 1 | 75.2 | 1 | 56.4 | 1 | 0.00 | 152 | 0 |
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| 1878 | 58.4 | 10 | 66.4 | 22 | 50.4 | 10 | 0.04 | 138 | 0 |
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| 1877 | 54.6 | 54 | 61.1 | 102 | 48.1 | 29 | 3.30 | 8 | 0 |
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| 1876 | 51.2 | 109 | 58.3 | 127 | 44.1 | 75 | 0.79 | 70 | 0 |
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| 1875 | 51.1 | 112 | 58.7 | 126 | 43.6 | 78 | 1.81 | 24 | 0 |
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| 1874 | 51.5 | 101 | 58.8 | 123 | 44.2 | 71 | 0.60 | 87 | 0 |
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| 1873 | | | | | | | 4.32 | 5 | 9 |
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| 1872 | | | | | | | 0.97 | 61 | 9 |
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| 1871 | | | | | | | 1.57 | 28 | 9 |
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