Every September in Reading, PA from 1869 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 | 68 | 39 | 76.7 | 67 | 59.3 | 19 | 5.31 | 35 | 0 |
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| 2025 | 70.2 | 9 | 80.9 | 12 | 59.4 | 17 | 2.90 | 90 | 0 |
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| 2024 | 68.6 | 28 | 78 | 41 | 59.1 | 21 | 1.08 | 139 | 0 |
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| 2023 | 68.5 | 29 | 78.1 | 37 | 58.9 | 27 | 5.64 | 29 | 0 |
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| 2022 | 67.9 | 41 | 78 | 41 | 57.9 | 35 | 4.60 | 46 | 0 |
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| 2021 | 68.9 | 23 | 78.6 | 29 | 59.1 | 21 | 8.22 | 8 | 0 |
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| 2020 | 67 | 63 | 77.1 | 57 | 56.8 | 60 | 4.00 | 54 | 0 |
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| 2019 | 69.3 | 17 | 80.3 | 19 | 58.4 | 31 | 2.01 | 123 | 0 |
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| 2018 | 70 | 10 | 77.4 | 51 | 62.6 | 2 | 8.03 | 9 | 0 |
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| 2017 | 67.7 | 45 | 78.1 | 37 | 57.4 | 48 | 3.62 | 66 | 0 |
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| 2016 | 70 | 10 | 81 | 10 | 59 | 24 | 4.65 | 44 | 0 |
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| 2015 | 70.3 | 8 | 81 | 10 | 59.7 | 14 | 5.32 | 34 | 0 |
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| 2014 | 67.1 | 57 | 77.9 | 45 | 56.3 | 72 | 1.80 | 124 | 0 |
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| 2013 | 65.1 | 90 | 76.7 | 67 | 53.5 | 108 | 1.31 | 136 | 0 |
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| 2012 | 66.8 | 68 | 77 | 62 | 56.6 | 66 | 4.90 | 37 | 0 |
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| 2011 | 68.5 | 29 | 76.4 | 74 | 60.7 | 8 | 11.63 | 2 | 0 |
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| 2010 | 69.3 | 17 | 81.2 | 7 | 57.5 | 46 | 6.69 | 19 | 0 |
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| 2009 | 64.9 | 93 | 73.7 | 112 | 56 | 76 | 3.21 | 80 | 0 |
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| 2008 | 67.1 | 57 | 77.2 | 55 | 57 | 57 | 5.73 | 28 | 0 |
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| 2007 | 68.5 | 29 | 80.4 | 17 | 56.5 | 68 | 0.98 | 142 | 0 |
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| 2006 | 63.6 | 116 | 72.4 | 123 | 54.7 | 92 | 7.51 | 14 | 0 |
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| 2005 | 70.5 | 6 | 82.8 | 1 | 58.1 | 32 | 0.55 | 148 | 0 |
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| 2004 | 67.5 | 48 | 77.1 | 57 | 57.9 | 35 | 7.73 | 11 | 0 |
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| 2003 | 65.7 | 83 | 74.1 | 108 | 57.2 | 53 | 9.25 | 4 | 0 |
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| 2002 | 68.9 | 23 | 80.1 | 20 | 57.8 | 38 | 3.46 | 71 | 0 |
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| 2001 | 63.6 | 116 | 75 | 102 | 52.2 | 124 | 5.04 | 36 | 0 |
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| 2000 | 62.8 | 124 | 73.2 | 117 | 52.5 | 122 | 4.73 | 42 | 0 |
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| 1999 | 66.1 | 76 | 75.8 | 83 | 56.4 | 71 | 12.35 | 1 | 0 |
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| 1998 | 69.4 | 15 | 80.7 | 14 | 58 | 33 | 1.61 | 130 | 0 |
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| 1997 | 65.2 | 88 | 75.8 | 83 | 54.6 | 96 | 3.61 | 67 | 0 |
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| 1996 | 66 | 77 | 75.3 | 98 | 56.8 | 60 | 4.80 | 40 | 0 |
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| 1995 | 65.8 | 82 | 77.9 | 45 | 53.7 | 107 | 3.11 | 83 | 0 |
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| 1994 | 64.5 | 102 | 75.7 | 88 | 53.3 | 113 | 3.23 | 79 | 0 |
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| 1993 | 65.9 | 78 | 75.3 | 98 | 56.5 | 68 | 9.03 | 6 | 0 |
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| 1992 | 64.3 | 106 | 74.4 | 105 | 54.2 | 101 | 4.11 | 51 | 0 |
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| 1991 | 64.3 | 106 | 76.6 | 71 | 52 | 126 | 4.32 | 49 | 0 |
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| 1990 | 63.3 | 121 | 73.9 | 109 | 52.7 | 118 | 2.12 | 118 | 0 |
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| 1989 | 65 | 91 | 75.2 | 100 | 54.7 | 92 | 4.88 | 38 | 0 |
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| 1988 | 62.2 | 128 | 73.6 | 113 | 50.8 | 128 | 2.44 | 110 | 0 |
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| 1987 | 64.6 | 98 | 74.3 | 107 | 54.8 | 88 | 10.34 | 3 | 0 |
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| 1986 | 64.9 | 93 | 76.3 | 76 | 53.5 | 108 | 2.77 | 95 | 0 |
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| 1985 | 67.1 | 57 | 79.5 | 25 | 54.7 | 92 | 6.50 | 21 | 0 |
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| 1984 | 63 | 123 | 75.8 | 83 | 50.2 | 129 | 2.37 | 113 | 0 |
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| 1983 | 66.9 | 65 | 81.1 | 9 | 52.7 | 118 | 0.95 | 143 | 0 |
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| 1982 | 64.1 | 111 | 75.4 | 96 | 52.9 | 114 | 2.73 | 96 | 0 |
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| 1981 | 64.4 | 105 | 74.4 | 105 | 54.3 | 100 | 3.07 | 85 | 0 |
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| 1980 | 68.5 | 29 | 81.7 | 5 | 55.3 | 82 | 3.37 | 73 | 0 |
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| 1979 | 64.7 | 96 | 76.7 | 67 | 52.7 | 118 | 6.30 | 23 | 1 |
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| 1978 | 64.6 | 98 | 77 | 62 | 52.1 | 125 | 1.80 | 124 | 0 |
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| 1977 | 66.9 | 65 | 77.5 | 49 | 56.3 | 72 | 3.51 | 69 | 0 |
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| 1976 | 62.6 | 125 | 75.6 | 92 | 49.6 | 130 | 3.48 | 70 | 0 |
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| 1975 | 60.8 | 131 | 72.5 | 122 | 49.1 | 131 | 9.05 | 5 | 0 |
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| 1974 | 64.2 | 108 | 75.6 | 92 | 52.8 | 117 | 6.29 | 24 | 0 |
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| 1973 | 65.5 | 85 | 76.9 | 64 | 54.1 | 104 | 6.81 | 18 | 0 |
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| 1972 | 66.8 | 68 | 78.8 | 28 | 54.8 | 88 | 0.93 | 144 | 0 |
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| 1971 | 68.8 | 25 | 77.4 | 51 | 60.2 | 11 | 3.31 | 75 | 0 |
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| 1970 | 69.6 | 12 | 82.6 | 2 | 56.6 | 66 | 2.48 | 108 | 0 |
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| 1969 | 66.5 | 71 | 79.6 | 24 | 53.4 | 110 | 3.41 | 72 | 0 |
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| 1968 | 69.5 | 14 | 80 | 22 | 58.9 | 27 | 3.86 | 57 | 0 |
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| 1967 | 65.5 | 85 | 76.2 | 77 | 54.8 | 88 | 1.32 | 134 | 0 |
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| 1966 | 65 | 91 | 73.2 | 117 | 56.7 | 62 | 5.35 | 33 | 0 |
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| 1965 | 69.1 | 22 | 78 | 41 | 60.1 | 12 | 2.99 | 87 | 0 |
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| 1964 | 67.6 | 46 | 78.6 | 29 | 56.7 | 62 | 1.32 | 134 | 0 |
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| 1963 | 63.5 | 120 | 73.6 | 113 | 53.4 | 110 | 5.46 | 31 | 0 |
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| 1962 | 63.6 | 116 | 72.3 | 124 | 55 | 86 | 4.39 | 47 | 0 |
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| 1961 | 73 | 1 | 82.3 | 3 | 63.6 | 1 | 2.62 | 100 | 0 |
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| 1960 | 67.4 | 50 | 75.8 | 83 | 59 | 24 | 5.92 | 26 | 0 |
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| 1959 | 70.9 | 5 | 80.7 | 14 | 61 | 6 | 2.25 | 117 | 0 |
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| 1958 | 66.4 | 73 | 76.5 | 72 | 56.3 | 72 | 4.77 | 41 | 0 |
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| 1957 | 68.8 | 25 | 78.1 | 37 | 59.4 | 17 | 2.56 | 103 | 0 |
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| 1956 | 63.7 | 115 | 72.6 | 121 | 54.7 | 92 | 3.72 | 62 | 0 |
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| 1955 | 66.8 | 68 | 75.7 | 88 | 57.8 | 38 | 2.07 | 121 | 0 |
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| 1954 | 68.1 | 36 | 77.4 | 51 | 58.7 | 29 | 1.63 | 129 | 0 |
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| 1953 | 68.5 | 29 | 79.1 | 27 | 57.9 | 35 | 2.70 | 97 | 0 |
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| 1952 | 67.9 | 41 | 78.4 | 33 | 57.4 | 48 | 6.83 | 17 | 0 |
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| 1951 | 67.1 | 57 | 77.2 | 55 | 57.1 | 55 | 2.87 | 91 | 0 |
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| 1950 | 63.8 | 113 | 71.2 | 129 | 56.5 | 68 | 3.88 | 56 | 0 |
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| 1949 | 64.2 | 108 | 73.9 | 109 | 54.5 | 97 | 3.27 | 77 | 0 |
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| 1948 | 67.3 | 52 | 78 | 41 | 56.7 | 62 | 3.02 | 86 | 0 |
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| 1947 | 67.3 | 52 | 76.9 | 64 | 57.7 | 43 | 3.28 | 76 | 0 |
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| 1946 | 68.3 | 34 | 79.7 | 23 | 57 | 57 | 2.65 | 98 | 0 |
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| 1945 | 69.2 | 21 | 78.1 | 37 | 60.3 | 10 | 6.87 | 16 | 0 |
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| 1944 | 67.6 | 46 | 76.1 | 80 | 59.1 | 21 | 5.61 | 30 | 0 |
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| 1943 | 65.9 | 78 | 77.5 | 49 | 54.4 | 99 | 1.13 | 138 | 0 |
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| 1942 | 66.9 | 65 | 77.1 | 57 | 56.7 | 62 | 3.98 | 55 | 0 |
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| 1941 | 69.3 | 17 | 81.4 | 6 | 57.2 | 53 | 0.37 | 151 | 0 |
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| 1940 | 64.5 | 102 | 74.9 | 103 | 54 | 105 | 3.66 | 64 | 0 |
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| 1939 | 67.1 | 57 | 76.4 | 74 | 57.7 | 43 | 2.55 | 104 | 0 |
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| 1938 | 64.1 | 111 | 72.3 | 124 | 55.9 | 77 | 4.70 | 43 | 0 |
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| 1937 | 64.7 | 96 | 73.8 | 111 | 55.6 | 79 | 0.89 | 145 | 0 |
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| 1936 | 67.8 | 44 | 76 | 81 | 59.5 | 15 | 1.02 | 140 | 0 |
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| 1935 | 63.8 | 113 | 72.7 | 120 | 55 | 86 | 3.09 | 84 | 0 |
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| 1934 | 67.3 | 52 | 75.1 | 101 | 59.5 | 15 | 8.03 | 9 | 0 |
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| 1933 | 68.2 | 35 | 75.6 | 92 | 60.9 | 7 | 2.84 | 92 | 0 |
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| 1932 | 68.1 | 36 | 78.6 | 29 | 57.5 | 46 | 0.66 | 147 | 0 |
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| 1931 | 72 | 2 | 81.9 | 4 | 62.1 | 3 | 2.79 | 94 | 0 |
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| 1930 | 71.4 | 3 | 81.2 | 7 | 61.6 | 5 | 3.25 | 78 | 0 |
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| 1929 | 68 | 39 | 78.2 | 36 | 57.8 | 38 | 4.31 | 50 | 0 |
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| 1928 | 63.2 | 122 | 71.1 | 130 | 55.3 | 82 | 3.19 | 81 | 0 |
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| 1927 | 67.4 | 50 | 77.8 | 47 | 57 | 57 | 2.08 | 119 | 0 |
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| 1926 | 65.2 | 88 | 73.3 | 116 | 57.1 | 55 | 4.07 | 53 | 0 |
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| 1925 | 69.4 | 15 | 78.6 | 29 | 60.1 | 12 | 2.53 | 107 | 0 |
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| 1924 | 62 | 129 | 71.1 | 130 | 52.9 | 114 | 6.33 | 22 | 0 |
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| 1923 | 67.5 | 48 | 76 | 81 | 59 | 24 | 3.34 | 74 | 0 |
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| 1922 | 68.1 | 36 | 78.4 | 33 | 57.8 | 38 | 1.16 | 137 | 0 |
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| 1921 | 71.3 | 4 | 80.8 | 13 | 61.8 | 4 | 3.70 | 63 | 0 |
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| 1920 | 67.3 | 52 | 76.9 | 64 | 57.6 | 45 | 3.83 | 58 | 0 |
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| 1919 | 67.2 | 56 | 77.1 | 57 | 57.3 | 50 | 2.08 | 119 | 0 |
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| 1918 | 62.3 | 127 | 72.2 | 126 | 52.5 | 122 | 2.64 | 99 | 0 |
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| 1917 | 62.5 | 126 | 72 | 127 | 52.9 | 114 | 2.42 | 111 | 0 |
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| 1916 | 65.9 | 78 | 76.5 | 72 | 55.3 | 82 | 2.62 | 100 | 0 |
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| 1915 | 69.3 | 17 | 79.4 | 26 | 59.3 | 19 | 2.26 | 116 | 0 |
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| 1914 | 64.2 | 108 | 75.8 | 83 | 52.6 | 121 | 0.43 | 150 | 0 |
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| 1913 | 64.6 | 98 | 73.6 | 113 | 55.6 | 79 | 5.37 | 32 | 0 |
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| 1912 | 67.1 | 57 | 76.2 | 77 | 58 | 33 | 6.02 | 25 | 0 |
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| 1911 | 65.9 | 78 | 75.5 | 95 | 56.2 | 75 | 2.55 | 104 | 0 |
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| 1910 | 67.9 | 41 | 78.4 | 33 | 57.3 | 50 | 2.05 | 122 | 0 |
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| 1909 | 65.6 | 84 | 76.7 | 67 | 54.5 | 97 | 2.45 | 109 | 0 |
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| 1908 | 66.3 | 75 | 77.8 | 47 | 54.8 | 88 | 1.71 | 126 | 0 |
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| 1907 | 67 | 63 | 76.2 | 77 | 57.8 | 38 | 8.65 | 7 | 0 |
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| 1906 | 69.6 | 12 | 80.6 | 16 | 58.5 | 30 | 2.94 | 88 | 0 |
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| 1905 | 66.4 | 73 | 77.3 | 54 | 55.4 | 81 | 2.61 | 102 | 0 |
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| 1904 | 65.3 | 87 | 75.4 | 96 | 55.2 | 85 | 2.94 | 88 | 0 |
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| 1903 | 64.8 | 95 | 75.7 | 88 | 53.9 | 106 | 2.84 | 92 | 0 |
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| 1902 | 64.5 | 102 | 74.8 | 104 | 54.2 | 101 | 7.71 | 12 | 0 |
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| 1901 | 66.5 | 71 | 77.1 | 57 | 55.8 | 78 | 3.79 | 60 | 0 |
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| 1900 | 70.4 | 7 | 80.4 | 17 | 60.5 | 9 | 1.67 | 127 | 0 |
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| 1899 | 64.6 | 98 | 75.7 | 88 | 53.4 | 110 | 5.76 | 27 | 0 |
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| 1898 | 68.7 | 27 | 80.1 | 20 | 57.3 | 50 | 1.40 | 133 | 0 |
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| 1897 | | | | | | | 1.54 | 132 | 30 |
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| 1896 | | | | | | | 3.66 | 64 | 30 |
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| 1895 | | | | | | | 0.37 | 151 | 30 |
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| 1894 | | | | | | | 7.48 | 15 | 30 |
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| 1892 | | | | | | | 2.54 | 106 | 30 |
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| 1889 | 63.6 | 116 | 72.9 | 119 | 54.2 | 101 | 4.08 | 52 | 0 |
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| 1888 | 61.7 | 130 | 71.7 | 128 | 51.7 | 127 | 7.58 | 13 | 0 |
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| 1886 | | | | | | | 1.00 | 141 | 30 |
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| 1885 | | | | | | | 0.50 | 149 | 30 |
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| 1884 | | | | | | | 0.68 | 146 | 30 |
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| 1883 | | | | | | | 3.80 | 59 | 30 |
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| 1882 | | | | | | | 4.65 | 44 | 30 |
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| 1881 | | | | | | | 1.66 | 128 | 30 |
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| 1880 | | | | | | | 2.36 | 114 | 30 |
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| 1878 | | | | | | | 3.18 | 82 | 30 |
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| 1877 | | | | | | | 4.34 | 48 | 30 |
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| 1875 | | | | | | | 1.55 | 131 | 30 |
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| 1874 | | | | | | | 3.52 | 68 | 30 |
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| 1873 | | | | | | | 6.65 | 20 | 30 |
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| 1872 | | | | | | | 3.78 | 61 | 30 |
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| 1871 | | | | | | | 2.34 | 115 | 30 |
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| 1870 | | | | | | | 2.38 | 112 | 30 |
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| 1869 | | | | | | | 4.83 | 39 | 30 |
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