Every August in Belvidere, NJ from 1893 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 | | | | | | | 6.96 | 27 | 9 |
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| 2025 | | | | | | | 2.09 | 115 | 31 |
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| 2024 | 72.1 | 45 | 82.9 | 61 | 61.4 | 36 | 9.39 | 11 | 0 |
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| 2023 | 71.3 | 60 | 81.4 | 78 | 61.2 | 40 | 5.13 | 49 | 0 |
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| 2022 | 75.6 | 4 | 87.9 | 6 | 63.4 | 10 | 2.32 | 108 | 1 |
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| 2021 | 73.8 | 19 | 83.7 | 48 | 63.9 | 6 | 9.51 | 10 | 0 |
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| 2020 | 73.8 | 19 | 84.8 | 31 | 62.7 | 19 | 8.86 | 13 | 0 |
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| 2019 | 71.7 | 51 | 83 | 60 | 60.5 | 51 | 7.51 | 23 | 2 |
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| 2018 | 74 | 17 | 83.5 | 52 | 64.5 | 3 | 7.95 | 18 | 0 |
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| 2017 | 69 | 99 | 80.6 | 90 | 57.4 | 98 | 5.86 | 41 | 2 |
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| 2016 | 73.8 | 19 | 85.5 | 19 | 62.1 | 27 | 3.26 | 83 | 0 |
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| 2015 | | | 82.9 | 61 | | | 3.89 | 70 | 9 |
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| 2014 | | | 81.1 | 80 | 56.5 | 109 | 2.09 | 115 | 4 |
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| 2013 | | | 79 | 115 | | | 4.46 | 59 | 6 |
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| 2012 | 72.2 | 42 | 83.4 | 56 | 60.7 | 47 | 3.60 | 75 | 3 |
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| 2011 | 70.9 | 68 | 81 | 85 | 60.7 | 47 | 13.86 | 2 | 1 |
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| 2010 | 71.6 | 53 | 82.8 | 63 | 60.5 | 51 | 2.12 | 114 | 0 |
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| 2009 | 72.4 | 37 | 82.4 | 70 | 62.5 | 21 | 6.14 | 36 | 1 |
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| 2008 | 71.6 | 53 | 84.1 | 41 | 59.1 | 74 | 1.51 | 127 | 2 |
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| 2007 | | | | | | | 6.35 | 33 | 18 |
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| 2006 | | | | | | | 3.34 | 81 | 12 |
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| 2005 | | | | | | | 2.71 | 101 | 13 |
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| 2004 | | | | | | | 6.96 | 27 | 19 |
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| 2003 | 74.5 | 11 | 85.1 | 27 | 63.8 | 8 | 9.84 | 8 | 0 |
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| 2002 | 76.6 | 2 | 89.3 | 1 | 63 | 14 | 2.37 | 106 | 1 |
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| 2001 | 74.5 | 11 | 86.2 | 13 | 62.5 | 21 | 1.60 | 126 | 3 |
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| 2000 | 69.1 | 97 | 79.5 | 107 | 58.6 | 78 | 4.04 | 66 | 1 |
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| 1999 | | | 84.8 | 31 | | | 3.96 | 68 | 4 |
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| 1998 | 73.1 | 30 | 84.5 | 35 | 61.8 | 30 | 4.62 | 55 | 3 |
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| 1997 | 68.3 | 106 | 80.2 | 95 | 57 | 104 | 5.26 | 46 | 2 |
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| 1996 | 70.6 | 72 | 81.1 | 80 | 60.1 | 56 | 1.63 | 125 | 2 |
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| 1995 | 72.9 | 32 | 85.7 | 17 | 60.1 | 56 | 0.87 | 132 | 3 |
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| 1994 | 69.5 | 89 | 79.4 | 111 | 59.4 | 69 | 7.61 | 21 | 1 |
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| 1993 | 72.3 | 40 | 83.6 | 50 | 61 | 43 | 2.32 | 108 | 0 |
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| 1992 | 67.4 | 111 | 78.4 | 120 | 56.4 | 111 | 2.97 | 90 | 0 |
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| 1991 | | | 83.9 | 44 | | | 2.30 | 112 | 5 |
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| 1990 | 70.8 | 69 | 80.4 | 93 | 61.4 | 36 | 7.05 | 24 | 1 |
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| 1989 | | | 78.9 | 116 | | | 4.48 | 58 | 4 |
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| 1988 | | | | | | | 3.66 | 73 | 10 |
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| 1987 | 69.2 | 95 | 79.9 | 101 | 58.4 | 82 | 4.97 | 50 | 2 |
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| 1986 | | | 79.3 | 113 | | | 6.17 | 35 | 5 |
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| 1985 | 69.7 | 85 | 81.3 | 79 | 57.9 | 91 | 4.12 | 64 | 2 |
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| 1984 | 71.8 | 49 | 82.1 | 74 | 61.2 | 40 | 2.85 | 96 | 2 |
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| 1983 | 73.2 | 28 | 86.5 | 10 | 59.9 | 61 | 2.21 | 113 | 0 |
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| 1982 | 67 | 113 | 79.1 | 114 | 55 | 116 | 2.97 | 90 | 1 |
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| 1981 | 70 | 83 | 80.7 | 88 | 59.3 | 71 | 2.04 | 118 | 0 |
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| 1980 | 74.2 | 14 | 84.5 | 35 | 63.8 | 8 | 1.65 | 124 | 0 |
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| 1979 | 70.1 | 82 | 78.9 | 116 | 61.4 | 36 | 2.92 | 93 | 0 |
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| 1978 | 71.4 | 58 | 79.6 | 104 | 63.3 | 11 | 9.03 | 12 | 1 |
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| 1977 | 69.7 | 85 | 79.9 | 101 | 59.5 | 67 | 4.50 | 57 | 0 |
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| 1976 | 69.2 | 95 | 80.1 | 97 | 58.2 | 86 | 3.84 | 71 | 0 |
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| 1975 | 70.4 | 75 | 80.6 | 90 | 60.1 | 56 | 4.85 | 52 | 0 |
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| 1974 | 70.4 | 75 | 81.1 | 80 | 59.7 | 63 | 9.73 | 9 | 1 |
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| 1973 | 72.2 | 42 | 82 | 76 | 62.4 | 23 | 2.98 | 89 | 0 |
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| 1972 | 69 | 99 | 80.1 | 97 | 58 | 89 | 1.37 | 129 | 0 |
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| 1971 | 69.4 | 91 | 80.8 | 86 | 58 | 89 | 8.54 | 15 | 0 |
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| 1970 | 70.6 | 72 | 83.5 | 52 | 57.7 | 94 | 3.42 | 78 | 0 |
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| 1969 | 70.3 | 79 | 82.3 | 71 | 58.3 | 84 | 5.71 | 42 | 0 |
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| 1968 | 70.4 | 75 | 82.5 | 68 | 58.3 | 84 | 2.96 | 92 | 0 |
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| 1967 | 69.3 | 93 | 78.7 | 118 | 59.9 | 61 | 10.48 | 6 | 0 |
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| 1966 | 71.5 | 55 | 85.4 | 21 | 57.7 | 94 | 2.07 | 117 | 0 |
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| 1965 | 68.5 | 104 | 80.1 | 97 | 56.9 | 108 | 3.42 | 78 | 0 |
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| 1964 | 65.8 | 115 | 78.5 | 119 | 53.2 | 118 | 1.39 | 128 | 0 |
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| 1963 | 66.4 | 114 | 78.4 | 120 | 54.4 | 117 | 2.47 | 104 | 0 |
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| 1962 | 69.1 | 97 | 79.8 | 103 | 58.4 | 82 | 4.17 | 62 | 0 |
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| 1961 | 71.1 | 65 | 80.8 | 86 | 61.5 | 33 | 6.51 | 31 | 0 |
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| 1960 | 71.2 | 63 | 81.5 | 77 | 60.9 | 45 | 6.73 | 30 | 0 |
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| 1959 | 73.4 | 24 | 83.7 | 48 | 63.1 | 12 | 5.60 | 44 | 0 |
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| 1958 | 73.3 | 27 | 85.1 | 27 | 61.5 | 33 | 3.14 | 84 | 0 |
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| 1957 | 71 | 67 | 84.8 | 31 | 57.1 | 102 | 1.28 | 130 | 0 |
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| 1956 | 72.7 | 34 | 85.2 | 24 | 60.2 | 54 | 3.58 | 76 | 0 |
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| 1955 | 77 | 1 | 88.7 | 2 | 65.4 | 1 | 11.06 | 5 | 0 |
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| 1954 | 71.9 | 48 | 84.2 | 40 | 59.6 | 64 | 7.68 | 20 | 0 |
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| 1953 | 72.4 | 37 | 86.3 | 12 | 58.5 | 81 | 1.75 | 122 | 0 |
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| 1952 | 71.5 | 55 | 83.6 | 50 | 59.5 | 67 | 5.67 | 43 | 0 |
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| 1951 | 71.2 | 63 | 83.8 | 47 | 58.6 | 78 | 6.00 | 37 | 0 |
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| 1950 | 72 | 47 | 84 | 42 | 60 | 60 | 1.79 | 121 | 0 |
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| 1949 | 74.8 | 7 | 86.7 | 9 | 62.8 | 16 | 4.82 | 53 | 0 |
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| 1948 | 73.9 | 18 | 85 | 29 | 62.8 | 16 | 4.55 | 56 | 0 |
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| 1947 | 75.2 | 5 | 86.2 | 13 | 64.2 | 5 | 2.90 | 94 | 0 |
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| 1946 | 68.8 | 103 | 80.6 | 90 | 57 | 104 | 4.87 | 51 | 0 |
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| 1945 | 71.5 | 55 | 83.5 | 52 | 59.6 | 64 | 5.92 | 38 | 0 |
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| 1944 | 74.6 | 9 | 88.4 | 4 | 60.8 | 46 | 3.13 | 85 | 0 |
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| 1943 | 73.5 | 23 | 87 | 7 | 60.1 | 56 | 3.44 | 77 | 0 |
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| 1942 | 71.7 | 51 | 82.7 | 65 | 60.6 | 50 | 7.02 | 25 | 0 |
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| 1941 | 70.5 | 74 | 84.4 | 38 | 56.5 | 109 | 5.17 | 48 | 0 |
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| 1940 | 69.4 | 91 | 80.1 | 97 | 58.7 | 77 | 6.40 | 32 | 0 |
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| 1939 | 74.5 | 11 | 85.9 | 16 | 63 | 14 | 3.68 | 72 | 0 |
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| 1938 | 73.6 | 22 | 85.4 | 21 | 61.8 | 30 | 2.32 | 108 | 0 |
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| 1937 | 74.6 | 9 | 86.5 | 10 | 62.6 | 20 | 12.35 | 3 | 0 |
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| 1936 | 75.1 | 6 | 88 | 5 | 62.2 | 26 | 6.97 | 26 | 0 |
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| 1935 | | | 83.9 | 44 | 62.4 | 23 | 2.78 | 98 | 4 |
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| 1934 | | | | | | | 2.69 | 102 | 8 |
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| 1933 | 72.6 | 35 | 83.4 | 56 | 61.8 | 30 | 10.30 | 7 | 1 |
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| 1932 | 74.2 | 14 | 88.5 | 3 | 59.6 | 64 | 3.05 | 88 | 1 |
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| 1931 | 73.4 | 24 | 84.8 | 31 | 62.1 | 27 | 2.75 | 100 | 1 |
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| 1930 | 71.3 | 60 | 85.5 | 19 | 57.1 | 102 | 3.37 | 80 | 1 |
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| 1929 | 70.7 | 71 | 84.4 | 38 | 57 | 104 | 4.16 | 63 | 0 |
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| 1928 | 74.8 | 7 | 85.7 | 17 | 63.9 | 6 | 14.26 | 1 | 0 |
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| 1927 | 67.9 | 109 | 79.5 | 107 | 56.2 | 113 | 7.82 | 19 | 0 |
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| 1926 | 72.5 | 36 | 82.7 | 65 | 62.3 | 25 | 5.20 | 47 | 0 |
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| 1925 | 71.4 | 58 | 85.2 | 24 | 57.5 | 97 | 0.94 | 131 | 0 |
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| 1924 | | | 82.1 | 74 | | | 3.09 | 86 | 5 |
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| 1923 | 68.2 | 107 | 80.4 | 93 | 56 | 114 | 2.47 | 104 | 1 |
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| 1922 | 70 | 83 | 81.1 | 80 | 58.9 | 75 | 3.97 | 67 | 0 |
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| 1921 | 68 | 108 | 78.1 | 123 | 57.8 | 93 | 4.42 | 61 | 0 |
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| 1920 | 70.8 | 69 | 79.5 | 107 | 62.1 | 27 | 4.66 | 54 | 0 |
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| 1919 | 67.8 | 110 | 78.2 | 122 | 57.4 | 98 | 6.75 | 29 | 0 |
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| 1918 | 72.9 | 32 | 84.5 | 35 | 61.4 | 36 | 0.61 | 133 | 1 |
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| 1917 | 73.2 | 28 | 84.9 | 30 | 61.5 | 33 | 2.77 | 99 | 0 |
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| 1916 | 72.1 | 45 | 84 | 42 | 60.5 | 51 | 1.69 | 123 | 3 |
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| 1915 | 69.3 | 93 | 79.4 | 111 | 59.3 | 71 | 6.27 | 34 | 0 |
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| 1914 | 71.1 | 65 | 81.1 | 80 | 61 | 43 | 2.88 | 95 | 0 |
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| 1913 | 71.3 | 60 | 82.5 | 68 | 60.2 | 54 | 8.35 | 17 | 0 |
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| 1912 | 68.4 | 105 | 79.5 | 107 | 57.2 | 100 | 5.50 | 45 | 0 |
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| 1911 | 71.8 | 49 | 82.6 | 67 | 61.1 | 42 | 7.58 | 22 | 0 |
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| 1910 | 68.9 | 101 | 80.2 | 95 | 57.6 | 96 | 3.07 | 87 | 0 |
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| 1909 | | | | | 55.6 | 115 | 1.88 | 120 | 4 |
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| 1908 | 69.5 | 89 | 80.7 | 88 | 58.2 | 86 | 3.93 | 69 | 0 |
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| 1907 | 69.6 | 88 | 82.3 | 71 | 57 | 104 | 2.79 | 97 | 0 |
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| 1906 | 74.2 | 14 | 83.2 | 58 | 65.2 | 2 | 2.36 | 107 | 0 |
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| 1905 | 70.2 | 81 | 79.6 | 104 | 60.7 | 47 | 3.62 | 74 | 0 |
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| 1904 | | | | | | | | | 14 |
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| 1903 | 67.1 | 112 | 76.4 | 124 | 57.9 | 91 | 5.90 | 40 | 0 |
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| 1902 | 68.9 | 101 | 79.6 | 104 | 58.2 | 86 | 4.11 | 65 | 0 |
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| 1901 | 73 | 31 | 82.8 | 63 | 63.1 | 12 | 8.58 | 14 | 0 |
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| 1900 | 75.7 | 3 | 86.9 | 8 | 64.5 | 3 | 1.92 | 119 | 0 |
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| 1899 | 70.3 | 79 | 83.5 | 52 | 57.2 | 100 | 5.91 | 39 | 0 |
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| 1898 | 73.4 | 24 | 83.9 | 44 | 62.8 | 16 | 8.40 | 16 | 0 |
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| 1897 | 70.4 | 75 | 82.3 | 71 | 58.6 | 78 | 4.44 | 60 | 0 |
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| 1896 | 72.3 | 40 | 85.3 | 23 | 59.4 | 69 | 2.32 | 108 | 0 |
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| 1895 | 72.2 | 42 | 85.2 | 24 | 59.2 | 73 | 3.32 | 82 | 0 |
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| 1894 | 69.7 | 85 | 83.1 | 59 | 56.3 | 112 | 2.64 | 103 | 0 |
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| 1893 | 72.4 | 37 | 86 | 15 | 58.8 | 76 | 11.94 | 4 | 0 |
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