Every January in Fort Wayne, IN from 1898 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 | 21.3 | 98 | 29.3 | 95 | 13.4 | 97 | 1.24 | 101 | 0 |
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| 2025 | 22.2 | 89 | 30 | 90 | 14.5 | 89 | 1.19 | 103 | 0 |
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| 2024 | 27.4 | 48 | 32 | 73 | 22.9 | 31 | 3.95 | 20 | 0 |
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| 2023 | 34.2 | 6 | 39.9 | 9 | 28.5 | 4 | 2.75 | 32 | 0 |
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| 2022 | 20.9 | 101 | 30 | 90 | 11.8 | 108 | 0.83 | 113 | 0 |
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| 2021 | 30 | 31 | 34.6 | 47 | 25.5 | 12 | 1.87 | 72 | 0 |
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| 2020 | 32.7 | 12 | 38.5 | 18 | 26.9 | 7 | 4.07 | 17 | 0 |
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| 2019 | 25.4 | 67 | 32.6 | 68 | 18.1 | 66 | 2.12 | 60 | 0 |
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| 2018 | 25.2 | 69 | 32.6 | 68 | 17.7 | 71 | 1.25 | 99 | 0 |
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| 2017 | 33.1 | 11 | 39.3 | 10 | 26.8 | 9 | 4.71 | 12 | 0 |
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| 2016 | 26.4 | 54 | 34.5 | 50 | 18.2 | 64 | 1.62 | 84 | 0 |
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| 2015 | 21.6 | 94 | 29.3 | 95 | 14 | 93 | 2.23 | 53 | 0 |
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| 2014 | 17 | 119 | 26.2 | 113 | 7.8 | 121 | 2.59 | 35 | 0 |
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| 2013 | 27.8 | 46 | 35.9 | 36 | 19.8 | 51 | 3.43 | 24 | 0 |
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| 2012 | 29.6 | 35 | 37.6 | 27 | 21.7 | 38 | 3.09 | 28 | 0 |
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| 2011 | 20.5 | 104 | 27.7 | 105 | 13.3 | 101 | 1.80 | 77 | 0 |
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| 2010 | 23 | 86 | 28.9 | 101 | 17.2 | 74 | 0.63 | 121 | 0 |
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| 2009 | 16.6 | 120 | 25.5 | 117 | 7.6 | 122 | 1.07 | 107 | 0 |
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| 2008 | 26.3 | 57 | 34.5 | 50 | 18.1 | 66 | 2.23 | 53 | 0 |
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| 2007 | 29.8 | 32 | 35.8 | 38 | 23.8 | 25 | 3.74 | 23 | 0 |
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| 2006 | 36.9 | 1 | 43.1 | 2 | 30.6 | 2 | 3.01 | 29 | 0 |
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| 2005 | 24.5 | 77 | 31.7 | 76 | 17.2 | 74 | 4.96 | 11 | 0 |
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| 2004 | 20.7 | 103 | 27.6 | 106 | 13.8 | 94 | 2.43 | 44 | 0 |
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| 2003 | 18.4 | 113 | 25.9 | 116 | 11 | 113 | 1.30 | 98 | 0 |
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| 2002 | 34 | 7 | 41.9 | 6 | 26.1 | 11 | 2.56 | 37 | 0 |
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| 2001 | 25.2 | 69 | 31.5 | 81 | 18.9 | 57 | 0.74 | 116 | 0 |
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| 2000 | 22.5 | 88 | 31.6 | 79 | 13.4 | 97 | 1.25 | 99 | 0 |
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| 1999 | 23.6 | 79 | 31.7 | 76 | 15.5 | 81 | 2.78 | 31 | 0 |
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| 1998 | 33.3 | 8 | 38.4 | 19 | 28.2 | 5 | 3.96 | 19 | 0 |
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| 1997 | 21.4 | 96 | 29.3 | 95 | 13.4 | 97 | 2.22 | 56 | 0 |
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| 1996 | 23.3 | 83 | 31.6 | 79 | 14.9 | 86 | 2.51 | 39 | 0 |
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| 1995 | 25.7 | 64 | 33.2 | 62 | 18.2 | 64 | 2.35 | 48 | 0 |
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| 1994 | 18.8 | 112 | 26.5 | 111 | 11.2 | 112 | 2.71 | 33 | 0 |
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| 1993 | 28.6 | 41 | 34.9 | 46 | 22.3 | 34 | 5.24 | 10 | 0 |
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| 1992 | 28.6 | 41 | 35.1 | 44 | 22.1 | 36 | 1.67 | 81 | 0 |
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| 1991 | 24.8 | 73 | 31 | 85 | 18.6 | 59 | 1.82 | 75 | 0 |
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| 1990 | 34.7 | 5 | 41.8 | 7 | 27.7 | 6 | 2.17 | 58 | 0 |
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| 1989 | 33.2 | 10 | 41.7 | 8 | 24.7 | 17 | 1.99 | 66 | 0 |
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| 1988 | 23.6 | 79 | 32.2 | 72 | 14.9 | 86 | 1.53 | 91 | 0 |
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| 1987 | 24.7 | 75 | 31.4 | 83 | 18 | 69 | 2.07 | 62 | 0 |
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| 1986 | 26.2 | 58 | 33.3 | 61 | 19.1 | 56 | 0.64 | 120 | 0 |
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| 1985 | 19.8 | 108 | 26.2 | 113 | 13.4 | 97 | 2.03 | 64 | 0 |
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| 1984 | 19.5 | 111 | 27.2 | 109 | 11.8 | 108 | 1.10 | 106 | 0 |
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| 1983 | 29.4 | 37 | 35 | 45 | 23.9 | 23 | 0.98 | 108 | 0 |
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| 1982 | 15.3 | 123 | 24.1 | 122 | 6.4 | 125 | 5.42 | 9 | 0 |
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| 1981 | 20.1 | 107 | 27.4 | 107 | 12.8 | 103 | 0.60 | 123 | 0 |
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| 1980 | 24.7 | 75 | 30.7 | 86 | 18.7 | 58 | 0.71 | 118 | 0 |
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| 1979 | 17.4 | 118 | 24.5 | 120 | 10.3 | 116 | 1.64 | 83 | 0 |
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| 1978 | 16 | 121 | 23.2 | 124 | 8.9 | 119 | 2.35 | 48 | 0 |
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| 1977 | 9.2 | 128 | 17.6 | 128 | 0.8 | 128 | 0.50 | 126 | 0 |
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| 1976 | 21.6 | 94 | 29 | 100 | 14.1 | 92 | 1.82 | 75 | 0 |
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| 1975 | 29.8 | 32 | 35.9 | 36 | 23.6 | 27 | 2.41 | 46 | 0 |
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| 1974 | 25.9 | 62 | 33.7 | 58 | 18.1 | 66 | 3.25 | 26 | 0 |
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| 1973 | 29.1 | 39 | 36.6 | 33 | 21.7 | 38 | 1.57 | 87 | 0 |
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| 1972 | 23.9 | 78 | 32.7 | 67 | 15.2 | 83 | 1.22 | 102 | 0 |
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| 1971 | 20.2 | 105 | 29.1 | 99 | 11.3 | 111 | 1.11 | 105 | 0 |
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| 1970 | 14.5 | 125 | 23.6 | 123 | 5.5 | 126 | 0.77 | 114 | 0 |
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| 1969 | 23.3 | 83 | 30.5 | 87 | 16.1 | 78 | 4.57 | 13 | 0 |
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| 1968 | 20.2 | 105 | 27.8 | 104 | 12.7 | 105 | 2.05 | 63 | 0 |
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| 1967 | 28.1 | 45 | 35.6 | 39 | 20.5 | 49 | 1.93 | 69 | 0 |
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| 1966 | 21.1 | 99 | 28.5 | 102 | 13.7 | 96 | 0.39 | 129 | 0 |
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| 1965 | 24.8 | 73 | 33.5 | 60 | 16 | 80 | 4.49 | 14 | 0 |
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| 1964 | 29.3 | 38 | 37 | 31 | 21.6 | 40 | 2.48 | 41 | 0 |
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| 1963 | 15.8 | 122 | 24.4 | 121 | 7.3 | 124 | 0.93 | 109 | 0 |
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| 1962 | 21.8 | 92 | 28.4 | 103 | 15.2 | 83 | 3.10 | 27 | 0 |
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| 1961 | 21.8 | 92 | 29.5 | 93 | 14.2 | 91 | 0.40 | 128 | 0 |
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| 1960 | 28.3 | 44 | 34.6 | 47 | 22 | 37 | 2.46 | 42 | 0 |
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| 1959 | 21.1 | 99 | 29.8 | 92 | 12.5 | 106 | 4.01 | 18 | 0 |
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| 1958 | 25.9 | 62 | 32.3 | 70 | 19.6 | 52 | 1.12 | 104 | 0 |
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| 1957 | 19.6 | 110 | 27.4 | 107 | 11.7 | 110 | 1.84 | 73 | 0 |
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| 1956 | 25.2 | 69 | 33.1 | 64 | 17.3 | 73 | 1.61 | 85 | 0 |
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| 1955 | 25.5 | 66 | 33 | 65 | 18 | 69 | 1.97 | 68 | 0 |
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| 1954 | 28.4 | 43 | 35.6 | 39 | 21.2 | 44 | 2.54 | 38 | 0 |
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| 1953 | 30.2 | 27 | 36.5 | 34 | 23.8 | 25 | 2.25 | 51 | 0 |
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| 1952 | 30.3 | 25 | 37.9 | 25 | 22.7 | 32 | 4.33 | 15 | 0 |
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| 1951 | 27.4 | 48 | 33.9 | 57 | 20.8 | 46 | 2.38 | 47 | 0 |
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| 1950 | 33.3 | 8 | 42.2 | 5 | 24.4 | 21 | 9.72 | 1 | 0 |
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| 1949 | 31.9 | 14 | 38.8 | 16 | 24.9 | 16 | 6.49 | 2 | 0 |
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| 1948 | 18.2 | 114 | 26.2 | 113 | 10.3 | 116 | 2.23 | 53 | 0 |
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| 1947 | 29.6 | 35 | 36.7 | 32 | 22.5 | 33 | 3.35 | 25 | 0 |
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| 1946 | 26.4 | 54 | 34.3 | 53 | 18.5 | 60 | 1.33 | 97 | 0 |
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| 1945 | 18 | 117 | 25.3 | 118 | 10.8 | 115 | 0.61 | 122 | 0 |
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| 1944 | 30.1 | 28 | 39 | 13 | 21.1 | 45 | 0.55 | 124 | 0 |
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| 1943 | 23.3 | 83 | 31.7 | 76 | 14.9 | 86 | 1.37 | 96 | 0 |
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| 1942 | 25.4 | 67 | 32.3 | 70 | 18.5 | 60 | 1.91 | 70 | 0 |
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| 1941 | 26.1 | 60 | 33 | 65 | 19.2 | 54 | 1.56 | 88 | 0 |
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| 1940 | 14.6 | 124 | 21.2 | 125 | 8.1 | 120 | 1.66 | 82 | 0 |
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| 1939 | 31.4 | 18 | 38.2 | 22 | 24.6 | 18 | 2.89 | 30 | 0 |
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| 1938 | 26.4 | 54 | 33.2 | 62 | 19.5 | 53 | 0.88 | 111 | 0 |
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| 1937 | 30.1 | 28 | 37.8 | 26 | 22.3 | 34 | 5.96 | 5 | 0 |
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| 1936 | 19.7 | 109 | 26.5 | 111 | 12.9 | 102 | 1.55 | 89 | 0 |
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| 1935 | 27.6 | 47 | 34.5 | 50 | 20.6 | 48 | 2.58 | 36 | 0 |
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| 1934 | 31.9 | 14 | 38.9 | 14 | 25 | 15 | 1.52 | 92 | 0 |
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| 1933 | 36.1 | 3 | 43.6 | 1 | 28.7 | 3 | 1.83 | 74 | 0 |
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| 1932 | 36.8 | 2 | 42.8 | 4 | 30.9 | 1 | 3.84 | 22 | 0 |
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| 1931 | 31.4 | 18 | 37.5 | 29 | 25.2 | 14 | 0.67 | 119 | 0 |
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| 1930 | 22.2 | 89 | 29.4 | 94 | 15.1 | 85 | 5.62 | 7 | 0 |
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| 1929 | 21.4 | 96 | 30.1 | 88 | 12.8 | 103 | 4.23 | 16 | 0 |
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| 1928 | 26.7 | 53 | 34.3 | 53 | 19.2 | 54 | 1.51 | 93 | 0 |
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| 1927 | 25.2 | 69 | 32 | 73 | 18.5 | 60 | 1.61 | 85 | 0 |
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| 1926 | 27.1 | 51 | 34 | 56 | 20.2 | 50 | 1.75 | 79 | 0 |
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| 1925 | 23.6 | 79 | 31.8 | 75 | 15.5 | 81 | 0.77 | 114 | 0 |
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| 1924 | 20.9 | 101 | 29.3 | 95 | 12.5 | 106 | 2.49 | 40 | 0 |
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| 1923 | 30.1 | 28 | 35.6 | 39 | 24.6 | 18 | 1.99 | 66 | 0 |
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| 1922 | 22.9 | 87 | 31.5 | 81 | 14.3 | 90 | 1.72 | 80 | 0 |
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| 1921 | 31.7 | 17 | 38 | 24 | 25.3 | 13 | 2.11 | 61 | 0 |
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| 1920 | 18.1 | 115 | 25.3 | 118 | 10.9 | 114 | 0.90 | 110 | 0 |
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| 1919 | 31.4 | 18 | 38.9 | 14 | 23.9 | 23 | 0.72 | 117 | 0 |
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| 1918 | 11.4 | 127 | 18.9 | 127 | 3.9 | 127 | 2.19 | 57 | 0 |
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| 1917 | 25.6 | 65 | 34.3 | 53 | 17 | 76 | 1.80 | 77 | 0 |
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| 1916 | 30.4 | 24 | 39.3 | 10 | 21.5 | 41 | 6.48 | 3 | 0 |
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| 1915 | 23.6 | 79 | 31.1 | 84 | 16.1 | 78 | 2.62 | 34 | 0 |
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| 1914 | 32.3 | 13 | 38.3 | 20 | 26.3 | 10 | 2.25 | 51 | 0 |
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| 1913 | 31.8 | 16 | 39.3 | 10 | 24.2 | 22 | 5.54 | 8 | 0 |
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| 1912 | 14.1 | 126 | 20.9 | 126 | 7.4 | 123 | 1.39 | 95 | 0 |
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| 1911 | 31.1 | 21 | 38.7 | 17 | 23.5 | 28 | 1.89 | 71 | 0 |
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| 1910 | 27.3 | 50 | 33.7 | 58 | 20.8 | 46 | 2.43 | 44 | 0 |
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| 1909 | 31 | 23 | 38.3 | 20 | 23.4 | 29 | 2.45 | 43 | 3 |
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| 1908 | 29 | 40 | 36.5 | 34 | 21.5 | 41 | 1.54 | 90 | 3 |
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| 1907 | 30.3 | 25 | 37.4 | 30 | 23.2 | 30 | 6.10 | 4 | 0 |
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| 1906 | 35 | 4 | 43.1 | 2 | 26.9 | 7 | 2.01 | 65 | 0 |
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| 1905 | 21.9 | 91 | 30.1 | 88 | 13.8 | 94 | 2.13 | 59 | 0 |
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| 1904 | 18.1 | 115 | 26.6 | 110 | 9.6 | 118 | 5.72 | 6 | 3 |
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| 1903 | | | | | | | 0.53 | 125 | 9 |
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| 1902 | 26.2 | 58 | 34.6 | 47 | 17.7 | 71 | 0.49 | 127 | 0 |
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| 1901 | 27 | 52 | 35.5 | 42 | 18.5 | 60 | 1.49 | 94 | 0 |
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| 1900 | 29.8 | 32 | 38.1 | 23 | 21.5 | 41 | 0.86 | 112 | 0 |
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| 1899 | 26 | 61 | 35.2 | 43 | 16.7 | 77 | 2.34 | 50 | 0 |
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| 1898 | 31.1 | 21 | 37.6 | 27 | 24.5 | 20 | 3.92 | 21 | 0 |
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