Every August 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 | 70.5 | 15 | 79.7 | 20 | 61.2 | 22 | 2.71 | 79 | 0 |
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| 2025 | 67.6 | 65 | 78.9 | 34 | 56.3 | 120 | 0.53 | 151 | 0 |
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| 2024 | 68.2 | 50 | 76.7 | 73 | 59.7 | 42 | 3.95 | 38 | 0 |
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| 2023 | 67.3 | 71 | 75.5 | 95 | 59.2 | 54 | 5.80 | 14 | 0 |
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| 2022 | 72.1 | 3 | 81.6 | 4 | 62.6 | 5 | 5.63 | 15 | 0 |
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| 2021 | 70.9 | 11 | 79.2 | 28 | 62.6 | 5 | 2.19 | 103 | 0 |
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| 2020 | 71.6 | 5 | 81.8 | 3 | 61.3 | 20 | 2.18 | 104 | 0 |
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| 2019 | 69 | 37 | 78.8 | 38 | 59.3 | 52 | 4.47 | 30 | 0 |
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| 2018 | 72.2 | 2 | 80.8 | 8 | 63.5 | 2 | 3.83 | 42 | 0 |
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| 2017 | 67.7 | 61 | 78.4 | 43 | 57 | 100 | 2.99 | 64 | 0 |
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| 2016 | 71.8 | 4 | 82.9 | 2 | 60.7 | 28 | 1.90 | 113 | 0 |
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| 2015 | 70.3 | 16 | 79.4 | 24 | 61.2 | 22 | 2.49 | 91 | 0 |
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| 2014 | 66.7 | 82 | 76.4 | 86 | 57.1 | 95 | 8.56 | 2 | 0 |
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| 2013 | 67.7 | 61 | 78.1 | 47 | 57.3 | 92 | 1.74 | 123 | 0 |
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| 2012 | 70.8 | 13 | 79.8 | 17 | 61.8 | 13 | 6.21 | 9 | 0 |
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| 2011 | 67.9 | 54 | 76.5 | 78 | 59.4 | 49 | 5.20 | 20 | 0 |
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| 2010 | 69.3 | 34 | 79.7 | 20 | 58.9 | 58 | 2.95 | 67 | 0 |
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| 2009 | 69.7 | 25 | 79 | 32 | 60.4 | 34 | 5.15 | 21 | 0 |
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| 2008 | 66.2 | 97 | 74.5 | 102 | 57.8 | 79 | 6.28 | 8 | 0 |
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| 2007 | 67.9 | 54 | 77.7 | 54 | 58 | 75 | 3.23 | 61 | 0 |
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| 2006 | 66.9 | 77 | 76.5 | 78 | 57.4 | 89 | 2.37 | 94 | 0 |
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| 2005 | 70.2 | 18 | 79.8 | 17 | 60.5 | 32 | 2.37 | 94 | 0 |
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| 2004 | 67.8 | 60 | 76.5 | 78 | 59.1 | 55 | 6.14 | 10 | 0 |
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| 2003 | 68.8 | 41 | 78 | 48 | 59.6 | 44 | 2.10 | 108 | 0 |
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| 2002 | 70 | 21 | 80.8 | 8 | 59.3 | 52 | 1.28 | 135 | 0 |
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| 2001 | 69.4 | 31 | 79.1 | 30 | 59.6 | 44 | 1.28 | 135 | 0 |
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| 2000 | 67.3 | 71 | 76.6 | 76 | 58 | 75 | 1.81 | 120 | 0 |
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| 1999 | 67.7 | 61 | 78.5 | 41 | 56.9 | 104 | 1.53 | 130 | 0 |
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| 1998 | 69.5 | 29 | 79.3 | 25 | 59.6 | 44 | 4.03 | 36 | 0 |
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| 1997 | 67.2 | 75 | 77 | 67 | 57.5 | 85 | 4.15 | 35 | 0 |
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| 1996 | 67.4 | 68 | 77.1 | 65 | 57.7 | 81 | 0.50 | 152 | 0 |
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| 1995 | 67.4 | 68 | 78.6 | 39 | 56.2 | 125 | 0.47 | 153 | 0 |
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| 1994 | 66.4 | 88 | 76.5 | 78 | 56.3 | 120 | 2.82 | 72 | 0 |
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| 1993 | 69.5 | 29 | 79.5 | 23 | 59.4 | 49 | 1.21 | 139 | 0 |
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| 1992 | 66.8 | 79 | 75.6 | 93 | 57.9 | 77 | 2.59 | 85 | 0 |
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| 1991 | 69.9 | 23 | 79.9 | 16 | 59.8 | 41 | 15.22 | 1 | 0 |
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| 1990 | 69.8 | 24 | 79.3 | 25 | 60.2 | 37 | 1.89 | 114 | 0 |
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| 1989 | 68 | 52 | 77.6 | 56 | 58.3 | 67 | 1.73 | 124 | 0 |
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| 1988 | 71.1 | 9 | 80.5 | 14 | 61.7 | 16 | 5.24 | 19 | 0 |
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| 1987 | 66.2 | 97 | 77 | 67 | 55.3 | 134 | 2.48 | 92 | 0 |
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| 1986 | 66.1 | 102 | 75.8 | 90 | 56.5 | 112 | 1.87 | 115 | 0 |
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| 1985 | 66.6 | 84 | 76.2 | 88 | 57 | 100 | 3.18 | 62 | 0 |
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| 1984 | 69.1 | 35 | 78.3 | 44 | 59.9 | 40 | 2.09 | 109 | 0 |
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| 1983 | 67.5 | 67 | 78 | 48 | 57.1 | 95 | 2.58 | 87 | 0 |
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| 1982 | 64.3 | 138 | 73.7 | 116 | 55 | 137 | 3.35 | 54 | 0 |
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| 1981 | 66 | 105 | 75.6 | 93 | 56.4 | 118 | 2.31 | 98 | 0 |
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| 1980 | 71.1 | 9 | 81 | 6 | 61.3 | 20 | 2.14 | 105 | 0 |
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| 1979 | 64.8 | 126 | 73.6 | 118 | 56 | 128 | 5.53 | 16 | 0 |
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| 1978 | 68.6 | 45 | 79.1 | 30 | 58.1 | 68 | 2.36 | 96 | 0 |
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| 1977 | 66.5 | 85 | 76.6 | 76 | 56.5 | 112 | 2.79 | 73 | 0 |
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| 1976 | 65.4 | 118 | 75.2 | 99 | 55.6 | 131 | 4.87 | 24 | 0 |
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| 1975 | 66.8 | 79 | 77.2 | 63 | 56.4 | 118 | 3.89 | 40 | 0 |
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| 1974 | 67.9 | 54 | 79 | 32 | 56.8 | 105 | 1.45 | 131 | 0 |
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| 1973 | 70.9 | 11 | 80 | 15 | 61.8 | 13 | 3.48 | 51 | 0 |
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| 1972 | 65.3 | 123 | 76.5 | 78 | 54.1 | 144 | 0.80 | 145 | 0 |
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| 1971 | 68.9 | 40 | 79.6 | 22 | 58.1 | 68 | 3.24 | 60 | 0 |
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| 1970 | 68.7 | 43 | 79.8 | 17 | 57.7 | 81 | 5.12 | 22 | 0 |
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| 1969 | 71.3 | 6 | 80.8 | 8 | 61.8 | 13 | 2.20 | 102 | 0 |
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| 1968 | 66.4 | 88 | 77.9 | 52 | 54.8 | 139 | 2.00 | 112 | 0 |
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| 1967 | 66.8 | 79 | 76 | 89 | 57.6 | 83 | 2.57 | 88 | 0 |
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| 1966 | 66.1 | 102 | 77.1 | 65 | 55.2 | 136 | 4.99 | 23 | 0 |
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| 1965 | 66.5 | 85 | 77.7 | 54 | 55.3 | 134 | 1.84 | 119 | 0 |
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| 1964 | 61.1 | 153 | 72.8 | 131 | 49.3 | 153 | 1.77 | 122 | 0 |
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| 1963 | 62.9 | 150 | 74 | 110 | 51.8 | 150 | 3.25 | 59 | 0 |
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| 1962 | 64.8 | 126 | 74.5 | 102 | 55 | 137 | 2.87 | 69 | 0 |
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| 1961 | 66.3 | 94 | 78 | 48 | 54.5 | 141 | 2.25 | 100 | 0 |
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| 1960 | 66.2 | 97 | 78.6 | 39 | 53.8 | 146 | 1.32 | 134 | 0 |
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| 1959 | 68.5 | 47 | 79.2 | 28 | 57.8 | 79 | 2.13 | 107 | 0 |
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| 1958 | 66.4 | 88 | 78.5 | 41 | 54.4 | 143 | 2.21 | 101 | 0 |
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| 1957 | 63.3 | 148 | 76.4 | 86 | 50.2 | 152 | 0.80 | 145 | 0 |
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| 1956 | 65.5 | 116 | 77.5 | 57 | 53.4 | 147 | 1.58 | 129 | 0 |
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| 1955 | 68.5 | 47 | 78.9 | 34 | 58.1 | 68 | 3.02 | 63 | 0 |
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| 1954 | 63.9 | 145 | 75.4 | 96 | 52.3 | 149 | 4.79 | 25 | 0 |
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| 1953 | 65.6 | 113 | 78.2 | 46 | 53 | 148 | 3.27 | 55 | 0 |
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| 1952 | 67.3 | 71 | 78.9 | 34 | 55.7 | 130 | 3.51 | 50 | 0 |
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| 1951 | 66.4 | 88 | 76.5 | 78 | 56.3 | 120 | 2.48 | 92 | 0 |
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| 1950 | 65.7 | 110 | 77.3 | 61 | 54.1 | 144 | 4.54 | 29 | 0 |
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| 1949 | 69 | 37 | 80.8 | 8 | 57.1 | 95 | 1.22 | 138 | 0 |
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| 1948 | 69.4 | 31 | 80.6 | 13 | 58.1 | 68 | 1.06 | 143 | 0 |
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| 1947 | 68.7 | 43 | 81 | 6 | 56.3 | 120 | 0.27 | 155 | 0 |
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| 1946 | 64.3 | 138 | 72.7 | 132 | 55.9 | 129 | 8.30 | 3 | 0 |
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| 1945 | 66.4 | 88 | 78 | 48 | 54.8 | 139 | 1.25 | 137 | 0 |
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| 1944 | 70.7 | 14 | 83.2 | 1 | 58.1 | 68 | 0.59 | 148 | 0 |
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| 1943 | 65.4 | 118 | 74.5 | 102 | 56.2 | 125 | 3.27 | 55 | 0 |
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| 1942 | 66.4 | 88 | 77.2 | 63 | 55.5 | 133 | 1.03 | 144 | 0 |
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| 1941 | 64.2 | 141 | 76.9 | 70 | 51.5 | 151 | 2.61 | 84 | 0 |
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| 1940 | 65.8 | 109 | 73.4 | 122 | 58.1 | 68 | 1.15 | 140 | 0 |
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| 1939 | 69.7 | 25 | 76.5 | 78 | 62.9 | 4 | 2.87 | 69 | 0 |
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| 1938 | 71.2 | 8 | 79.3 | 25 | 63 | 3 | 1.69 | 126 | 0 |
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| 1937 | 72.5 | 1 | 80.8 | 8 | 64.1 | 1 | 1.79 | 121 | 0 |
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| 1936 | 67.2 | 75 | 74.8 | 100 | 59.5 | 48 | 2.05 | 111 | 0 |
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| 1935 | 69 | 37 | 76.7 | 73 | 61.2 | 22 | 2.69 | 81 | 0 |
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| 1934 | 64.7 | 130 | 72.9 | 127 | 56.5 | 112 | 1.10 | 142 | 0 |
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| 1933 | 67.9 | 54 | 74.6 | 101 | 61.2 | 22 | 2.85 | 71 | 0 |
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| 1932 | 70.1 | 19 | 77.9 | 52 | 62.3 | 9 | 4.47 | 30 | 0 |
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| 1931 | 68 | 52 | 75.4 | 96 | 60.6 | 30 | 3.40 | 52 | 0 |
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| 1930 | 65.7 | 110 | 72.7 | 132 | 58.6 | 61 | 2.62 | 83 | 0 |
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| 1929 | 64.8 | 126 | 73 | 125 | 56.5 | 112 | 4.28 | 34 | 0 |
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| 1928 | 69.4 | 31 | 76.7 | 73 | 62 | 11 | 3.52 | 49 | 0 |
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| 1927 | 63.3 | 148 | 70.4 | 151 | 56.1 | 127 | 5.46 | 17 | 0 |
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| 1926 | 64.9 | 125 | 72.3 | 139 | 57.5 | 85 | 1.87 | 115 | 0 |
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| 1925 | 67.6 | 65 | 76.9 | 70 | 58.4 | 66 | 0.55 | 149 | 0 |
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| 1924 | 66.5 | 85 | 73.8 | 113 | 59.1 | 55 | 3.36 | 53 | 0 |
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| 1923 | 64.1 | 142 | 71.9 | 144 | 56.3 | 120 | | | 0 |
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| 1922 | 67.3 | 71 | 73.9 | 112 | 60.6 | 30 | 2.75 | 77 | 0 |
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| 1921 | 65.6 | 113 | 74.4 | 105 | 56.7 | 108 | 2.59 | 85 | 0 |
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| 1920 | 67.9 | 54 | 74.3 | 107 | 61.6 | 17 | 3.56 | 48 | 1 |
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| 1919 | 64.1 | 142 | 71.4 | 147 | 56.7 | 108 | 1.85 | 117 | 0 |
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| 1918 | 65.4 | 118 | 73.2 | 124 | 57.6 | 83 | 4.64 | 28 | 0 |
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| 1917 | 66.9 | 77 | 73.5 | 120 | 60.3 | 35 | 4.78 | 26 | 0 |
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| 1916 | 66.3 | 94 | 74.2 | 108 | 58.5 | 62 | 2.14 | 105 | 0 |
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| 1915 | 63.8 | 146 | 70.8 | 149 | 56.8 | 105 | 5.87 | 13 | 0 |
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| 1914 | 64.1 | 142 | 71.1 | 148 | 57.1 | 95 | 3.81 | 43 | 0 |
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| 1913 | 65.7 | 110 | 74 | 110 | 57.4 | 89 | 2.99 | 64 | 0 |
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| 1912 | 62.9 | 150 | 70.1 | 152 | 55.6 | 131 | 2.26 | 99 | 0 |
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| 1911 | 64.6 | 131 | 72.2 | 141 | 57.1 | 95 | 2.56 | 90 | 0 |
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| 1910 | 64.3 | 138 | 72.2 | 141 | 56.5 | 112 | 2.79 | 73 | 0 |
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| 1909 | 66.2 | 97 | 74.4 | 105 | 57.9 | 77 | 1.68 | 127 | 0 |
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| 1908 | 65.4 | 118 | 72.7 | 132 | 58.1 | 68 | 3.73 | 44 | 0 |
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| 1907 | 64.6 | 131 | 72.4 | 138 | 56.8 | 105 | 2.07 | 110 | 0 |
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| 1906 | 69.1 | 35 | 77.5 | 57 | 60.7 | 28 | 1.73 | 124 | 0 |
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| 1905 | 65 | 124 | 72.5 | 135 | 57.5 | 85 | 2.78 | 75 | 0 |
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| 1904 | 64.5 | 136 | 72.5 | 135 | 56.6 | 111 | 3.64 | 47 | 0 |
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| 1903 | 61.5 | 152 | 68.5 | 153 | 54.5 | 141 | 1.85 | 117 | 0 |
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| 1902 | 63.6 | 147 | 70.6 | 150 | 56.5 | 112 | 4.36 | 32 | 0 |
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| 1901 | 67.4 | 68 | 73.8 | 113 | 61 | 27 | 3.26 | 58 | 0 |
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| 1900 | 67.7 | 61 | 75.8 | 90 | 59.7 | 42 | 3.72 | 46 | 0 |
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| 1899 | 65.5 | 116 | 72.5 | 135 | 58.5 | 62 | 1.66 | 128 | 0 |
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| 1898 | 69.7 | 25 | 77.4 | 59 | 62.1 | 10 | 3.88 | 41 | 0 |
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| 1897 | 65.9 | 107 | 73.3 | 123 | 58.5 | 62 | 1.41 | 133 | 0 |
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| 1896 | 66.1 | 102 | 73.5 | 120 | 58.7 | 60 | 2.57 | 88 | 0 |
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| 1895 | 66.2 | 97 | 73.8 | 113 | 58.5 | 62 | 4.72 | 27 | 0 |
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| 1894 | 64.6 | 131 | 71.9 | 144 | 57.4 | 89 | 3.27 | 55 | 0 |
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| 1893 | 66.7 | 82 | 74.1 | 109 | 59.4 | 49 | 2.74 | 78 | 0 |
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| 1892 | 66.3 | 94 | 72.9 | 127 | 59.6 | 44 | 8.14 | 4 | 0 |
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| 1891 | 66 | 105 | 73 | 125 | 59.1 | 55 | 1.15 | 140 | 0 |
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| 1890 | 65.9 | 107 | 72.9 | 127 | 58.9 | 58 | 2.99 | 64 | 0 |
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| 1889 | 64.6 | 131 | 72.2 | 141 | 57 | 100 | 2.76 | 76 | 0 |
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| 1888 | 65.6 | 113 | 73.6 | 118 | 57.5 | 85 | 4.36 | 32 | 0 |
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| 1887 | 64.6 | 131 | 72.3 | 139 | 57 | 100 | 6.56 | 7 | 0 |
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| 1886 | 65.4 | 118 | 73.7 | 116 | 57.2 | 94 | 3.93 | 39 | 0 |
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| 1885 | 64.5 | 136 | 71.6 | 146 | 57.3 | 92 | 5.91 | 11 | 0 |
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| 1884 | 68.4 | 49 | 75.7 | 92 | 61.1 | 26 | 3.98 | 37 | 0 |
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| 1883 | 68.2 | 50 | 76.5 | 78 | 60 | 39 | 0.36 | 154 | 0 |
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| 1882 | 70.3 | 16 | 78.9 | 34 | 61.6 | 17 | 0.66 | 147 | 0 |
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| 1881 | 70 | 21 | 77.4 | 59 | 62.6 | 5 | 1.42 | 132 | 0 |
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| 1880 | 68.8 | 41 | 77.3 | 61 | 60.2 | 37 | 2.32 | 97 | 0 |
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| 1879 | 68.6 | 45 | 77 | 67 | 60.3 | 35 | 3.73 | 44 | 0 |
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| 1878 | 67.9 | 54 | 75.4 | 96 | 60.5 | 32 | 2.93 | 68 | 0 |
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| 1877 | 69.7 | 25 | 76.9 | 70 | 62.5 | 8 | 7.90 | 5 | 0 |
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| 1876 | 71.3 | 6 | 81.2 | 5 | 61.4 | 19 | 0.54 | 150 | 0 |
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| 1875 | 70.1 | 19 | 78.3 | 44 | 62 | 11 | 2.70 | 80 | 0 |
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| 1874 | 64.8 | 126 | 72.9 | 127 | 56.7 | 108 | 5.29 | 18 | 0 |
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| 1873 | | | | | | | 2.63 | 82 | 31 |
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| 1872 | | | | | | | 6.97 | 6 | 31 |
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| 1871 | | | | | | | 5.88 | 12 | 31 |
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