Every October in El Cajon, CA from 1899 to 2025, 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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| 2025 | 67.5 | 33 | 80.4 | 66 | 54.6 | 28 | 0.37 | 51 | 0 |
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| 2024 | 68.9 | 18 | 82.9 | 34 | 55 | 23 | 0.01 | 88 | 0 |
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| 2023 | 68.7 | 23 | 82.4 | 38 | 55 | 23 | 0.19 | 71 | 0 |
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| 2022 | 68.8 | 20 | 79.1 | 79 | 58.5 | 5 | 0.20 | 68 | 0 |
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| 2021 | 66.4 | 42 | 78.9 | 82 | 53.8 | 34 | 1.16 | 19 | 0 |
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| 2020 | 72.5 | 3 | 87 | 4 | 58 | 6 | 0.00 | 101 | 0 |
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| 2019 | 67.9 | 26 | 83.9 | 22 | 51.8 | 49 | 0.00 | 101 | 0 |
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| 2018 | 69.1 | 16 | 80.8 | 61 | 57.4 | 8 | 0.54 | 38 | 0 |
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| 2017 | 71.4 | 5 | 86.2 | 7 | 56.6 | 11 | 0.00 | 101 | 0 |
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| 2016 | 70.3 | 7 | 83.1 | 29 | 57.5 | 7 | 0.15 | 74 | 0 |
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| 2015 | 73.3 | 1 | 84.7 | 16 | 61.8 | 2 | 0.75 | 33 | 0 |
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| 2014 | 72 | 4 | 84.8 | 14 | 59.1 | 4 | 0.01 | 88 | 0 |
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| 2013 | 65.3 | 65 | 77.3 | 98 | 53.2 | 40 | 0.77 | 31 | 1 |
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| 2012 | 69.5 | 12 | 82.7 | 35 | 56.3 | 14 | 0.43 | 44 | 0 |
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| 2011 | 67.3 | 35 | 81.1 | 55 | 53.3 | 38 | 0.44 | 42 | 1 |
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| 2010 | 66 | 47 | 75.2 | 103 | 56.8 | 10 | 2.54 | 6 | 0 |
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| 2009 | 67.6 | 31 | 81.4 | 50 | 53.7 | 36 | 0.01 | 88 | 0 |
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| 2008 | | | | | | | 0.00 | 101 | 6 |
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| 2007 | | | | | | | | | 7 |
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| 2006 | | | | | | | | | 10 |
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| 2005 | | | | | | | | | 6 |
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| 2004 | | | | | | | 5.22 | 1 | 8 |
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| 2003 | | | | | | | 0.00 | 101 | 8 |
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| 2002 | | | | | 55 | 23 | trace | 93 | 5 |
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| 2001 | | | | | | | 0.00 | 101 | 7 |
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| 2000 | 65.7 | 53 | 75.7 | 102 | 55.7 | 18 | 1.28 | 16 | 3 |
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| 1999 | | | | | | | 0.00 | 101 | 5 |
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| 1997 | 70 | 9 | 84.2 | 21 | 55.8 | 17 | 0.03 | 84 | 2 |
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| 1996 | | | | | | | 0.90 | 25 | 7 |
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| 1995 | 69.3 | 14 | 83.9 | 22 | 53.8 | 34 | trace | 93 | 1 |
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| 1994 | 66.1 | 45 | 78.1 | 91 | 54.2 | 30 | 0.08 | 81 | 1 |
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| 1993 | | | | | 56.2 | 15 | 0.24 | 64 | 5 |
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| 1991 | | | | | | | 0.84 | 28 | 8 |
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| 1990 | 69.3 | 14 | 83.7 | 24 | 55.1 | 22 | 0.21 | 67 | 3 |
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| 1989 | 67 | 39 | 78.7 | 83 | 55.4 | 20 | 0.41 | 48 | 2 |
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| 1988 | | | | | | | 0.00 | 101 | 6 |
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| 1987 | | | 81.3 | 52 | 60.8 | 3 | 1.60 | 11 | 4 |
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| 1986 | | | 78.2 | 89 | 54 | 32 | 1.92 | 9 | 4 |
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| 1985 | 67.9 | 26 | 79.9 | 68 | 56.4 | 13 | 0.11 | 78 | 3 |
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| 1984 | | | 77.7 | 97 | 54.5 | 29 | 0.00 | 101 | 4 |
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| 1983 | 69.8 | 10 | 83.6 | 25 | 55.9 | 16 | 0.18 | 72 | 3 |
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| 1982 | 67.6 | 31 | 84.6 | 18 | 50.9 | 55 | 0.15 | 74 | 1 |
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| 1981 | 65.4 | 62 | 78.2 | 89 | 52.5 | 41 | 0.38 | 50 | 0 |
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| 1980 | 67.8 | 30 | 83.6 | 25 | 52.1 | 47 | 0.47 | 40 | 1 |
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| 1978 | | | | | 57.1 | 9 | 0.05 | 83 | 9 |
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| 1977 | 68.8 | 20 | 81 | 57 | 56.6 | 11 | 0.87 | 27 | 2 |
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| 1976 | 68.5 | 24 | 82.2 | 39 | 54.9 | 27 | 0.79 | 30 | 0 |
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| 1975 | 64.7 | 75 | 78.3 | 88 | 51.2 | 54 | 0.11 | 78 | 0 |
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| 1974 | 65.8 | 51 | 76.3 | 100 | 55.6 | 19 | 1.99 | 8 | 2 |
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| 1973 | 66.1 | 45 | 81.9 | 43 | 50.4 | 60 | trace | 93 | 0 |
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| 1972 | 65.7 | 53 | 76.3 | 100 | 55.2 | 21 | 1.30 | 14 | 0 |
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| 1971 | 64.1 | 82 | 79.4 | 74 | 48.9 | 79 | 1.22 | 18 | 0 |
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| 1970 | 65.5 | 58 | 78.4 | 86 | 52.5 | 41 | 0.06 | 82 | 0 |
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| 1969 | 64.4 | 78 | 79.2 | 76 | 49.6 | 69 | trace | 93 | 0 |
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| 1968 | 66.7 | 40 | 81.8 | 46 | 51.6 | 50 | 0.01 | 88 | 0 |
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| 1967 | 69.5 | 12 | 86.8 | 5 | 52.2 | 46 | 0.00 | 101 | 0 |
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| 1966 | 67.5 | 33 | 83.1 | 29 | 52.1 | 47 | 0.52 | 39 | 1 |
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| 1965 | 68.8 | 20 | 87.2 | 2 | 50.5 | 59 | trace | 93 | 0 |
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| 1964 | 70.5 | 6 | 86.7 | 6 | 54.2 | 30 | 0.12 | 77 | 0 |
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| 1963 | 67.3 | 35 | 80.7 | 62 | 53.9 | 33 | 0.34 | 54 | 0 |
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| 1962 | 66 | 47 | 80.5 | 64 | 51.3 | 53 | 0.01 | 88 | 1 |
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| 1961 | 66.2 | 44 | 81 | 57 | 51.5 | 51 | 0.36 | 53 | 2 |
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| 1960 | 65.3 | 65 | 80.3 | 67 | 50.6 | 58 | 0.16 | 73 | 1 |
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| 1959 | | | | | | | | | 8 |
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| 1958 | 70.1 | 8 | 87.8 | 1 | 52.5 | 41 | 0.03 | 84 | 0 |
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| 1957 | 62.1 | 94 | 74.1 | 105 | 50.1 | 63 | 2.60 | 5 | 0 |
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| 1956 | 64.1 | 82 | 79 | 81 | 49.2 | 74 | 0.44 | 42 | 0 |
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| 1955 | 63.7 | 88 | 78.1 | 91 | 49.3 | 72 | 0.00 | 101 | 1 |
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| 1954 | 64.2 | 80 | 81.9 | 43 | 46.5 | 98 | 0.00 | 101 | 0 |
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| 1953 | 67.9 | 26 | 86.1 | 9 | 49.6 | 69 | 0.03 | 84 | 0 |
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| 1952 | 67.9 | 26 | 85.8 | 10 | 49.9 | 66 | 0.00 | 101 | 0 |
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| 1951 | 65.3 | 65 | 83.1 | 29 | 47.6 | 91 | 0.92 | 24 | 0 |
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| 1950 | 66 | 47 | 85.5 | 12 | 46.5 | 98 | 0.00 | 101 | 0 |
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| 1949 | | | | | | | | | 4 |
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| 1948 | 64.4 | 78 | 78.7 | 83 | 50.1 | 63 | 0.88 | 26 | 0 |
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| 1947 | 65.5 | 58 | 81.7 | 47 | 49.2 | 74 | 0.28 | 60 | 0 |
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| 1946 | 61.9 | 96 | 79.1 | 79 | 44.7 | 105 | 1.00 | 21 | 0 |
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| 1945 | 67.3 | 35 | 81.3 | 52 | 53.3 | 38 | trace | 93 | 1 |
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| 1944 | 65.3 | 65 | 82.2 | 39 | 48.3 | 85 | 0.00 | 101 | 0 |
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| 1943 | 65.4 | 62 | 81 | 57 | 50.2 | 62 | 0.23 | 65 | 1 |
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| 1942 | 64.7 | 75 | 80.5 | 64 | 48.9 | 79 | 0.37 | 51 | 0 |
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| 1941 | 64 | 85 | 77.8 | 95 | 50.1 | 63 | 3.13 | 3 | 0 |
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| 1940 | 66.4 | 42 | 83.4 | 27 | 49.9 | 66 | 1.28 | 16 | 3 |
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| 1939 | | | 84.8 | 14 | | | 0.43 | 44 | 6 |
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| 1938 | 64.1 | 82 | 79.6 | 71 | 48.4 | 84 | 0.34 | 54 | 3 |
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| 1937 | 67.1 | 38 | 85.3 | 13 | 49 | 78 | 0.00 | 101 | 0 |
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| 1936 | 65 | 74 | 79.3 | 75 | 50.7 | 57 | 1.67 | 10 | 0 |
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| 1935 | 63.7 | 88 | 79.2 | 76 | 48.2 | 87 | 0.09 | 80 | 0 |
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| 1934 | | | 81.5 | 48 | | | 0.42 | 47 | 4 |
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| 1933 | 65.4 | 62 | 81.9 | 43 | 49.2 | 74 | 0.15 | 74 | 2 |
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| 1932 | 59.8 | 102 | 75.1 | 104 | 44.5 | 107 | 1.30 | 14 | 0 |
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| 1931 | 65.1 | 71 | 81 | 57 | 49.3 | 72 | 0.33 | 56 | 0 |
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| 1930 | 65.6 | 56 | 82.6 | 36 | 48.5 | 83 | 0.47 | 40 | 0 |
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| 1929 | 69 | 17 | 85.6 | 11 | 52.4 | 44 | trace | 93 | 0 |
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| 1928 | 63.6 | 90 | 79.5 | 73 | 47.6 | 91 | 0.95 | 22 | 0 |
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| 1927 | 65.7 | 53 | 83.1 | 29 | 48.3 | 85 | 3.08 | 4 | 0 |
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| 1926 | 65.2 | 70 | 82.5 | 37 | 47.8 | 90 | 0.31 | 58 | 0 |
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| 1925 | 62 | 95 | 73.7 | 106 | 50.3 | 61 | 5.02 | 2 | 0 |
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| 1924 | 61.3 | 99 | 78 | 93 | 44.6 | 106 | 0.22 | 66 | 0 |
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| 1923 | 63.8 | 87 | 81.1 | 55 | 46.5 | 98 | 0.43 | 44 | 0 |
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| 1922 | 65.1 | 71 | 82.2 | 39 | 48.1 | 88 | 0.30 | 59 | 0 |
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| 1921 | 66 | 47 | 79.7 | 70 | 52.4 | 44 | 1.38 | 13 | 0 |
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| 1920 | 61.3 | 99 | 77 | 99 | 45.5 | 103 | 0.74 | 35 | 0 |
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| 1919 | 61.6 | 97 | 77.9 | 94 | 45.3 | 104 | 0.75 | 33 | 0 |
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| 1918 | 69.7 | 11 | 84.4 | 19 | 55 | 23 | 0.82 | 29 | 0 |
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| 1917 | 68.9 | 18 | 86.2 | 7 | 51.5 | 51 | | | 0 |
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| 1916 | 60.4 | 101 | 73.7 | 106 | 47.2 | 94 | 1.57 | 12 | 0 |
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| 1915 | 64.6 | 77 | 83.1 | 29 | 46.2 | 102 | 0.00 | 101 | 0 |
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| 1914 | 65.3 | 65 | 79.6 | 71 | 50.9 | 55 | 1.09 | 20 | 0 |
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| 1913 | 65.5 | 58 | 82.1 | 42 | 48.9 | 79 | 0.02 | 87 | 0 |
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| 1912 | 62.9 | 92 | 77.8 | 95 | 48 | 89 | 0.77 | 31 | 0 |
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| 1911 | | | | | | | 0.28 | 60 | 8 |
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| 1910 | 65.6 | 56 | 81.5 | 48 | 49.7 | 68 | 0.94 | 23 | 0 |
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| 1909 | 64.2 | 80 | 81.2 | 54 | 47.1 | 95 | 0.00 | 101 | 0 |
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| 1908 | 61.6 | 97 | 79.2 | 76 | 44 | 108 | 0.59 | 37 | 0 |
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| 1907 | 66.6 | 41 | 79.9 | 68 | 53.4 | 37 | 2.10 | 7 | 0 |
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| 1906 | 68.2 | 25 | 87.1 | 3 | 49.4 | 71 | trace | 93 | 0 |
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| 1905 | 65.5 | 58 | 84.4 | 19 | 46.7 | 97 | 0.25 | 63 | 0 |
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| 1904 | 72.9 | 2 | 83.3 | 28 | 62.5 | 1 | 0.27 | 62 | 0 |
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| 1903 | 65.8 | 51 | 84.7 | 16 | 46.8 | 96 | 0.20 | 68 | 0 |
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| 1902 | 63.9 | 86 | 78.5 | 85 | 49.2 | 74 | 0.20 | 68 | 1 |
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| 1901 | 65.1 | 71 | 81.4 | 50 | 48.8 | 82 | 0.32 | 57 | 0 |
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| 1900 | 63.5 | 91 | 80.6 | 63 | 46.3 | 101 | 0.40 | 49 | 0 |
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| 1899 | 62.8 | 93 | 78.4 | 86 | 47.3 | 93 | 0.67 | 36 | 0 |
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