Every September in Havre, MT from 1880 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 | 59.2 | 34 | 74.5 | 34 | 43.9 | 42 | 1.07 | 63 | 0 |
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| 2025 | 62.8 | 9 | 80.6 | 5 | 45 | 24 | 0.07 | 144 | 2 |
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| 2024 | 63.5 | 5 | 79.2 | 11 | 47.8 | 4 | 2.17 | 17 | 0 |
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| 2023 | 61.7 | 13 | 76.7 | 22 | 46.7 | 7 | 1.29 | 51 | 0 |
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| 2022 | 63.5 | 5 | 81 | 3 | 46 | 12 | 0.31 | 122 | 0 |
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| 2021 | 60.9 | 18 | 78.5 | 15 | 43.3 | 51 | 0.05 | 146 | 0 |
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| 2020 | 58.6 | 42 | 73.8 | 41 | 43.3 | 51 | 1.62 | 36 | 0 |
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| 2019 | 57.1 | 68 | 70 | 90 | 44.3 | 34 | 2.48 | 12 | 0 |
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| 2018 | 54.6 | 115 | 66.5 | 125 | 42.7 | 65 | 1.78 | 23 | 0 |
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| 2017 | 57.7 | 55 | 73.3 | 48 | 42 | 82 | 0.97 | 69 | 0 |
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| 2016 | 57 | 70 | 70.4 | 86 | 43.5 | 47 | 1.80 | 22 | 0 |
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| 2015 | 56.8 | 77 | 71.6 | 68 | 41.9 | 84 | 1.67 | 31 | 0 |
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| 2014 | 57.1 | 68 | 71.5 | 69 | 42.6 | 66 | 0.84 | 79 | 0 |
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| 2013 | 62.1 | 12 | 76.8 | 21 | 47.4 | 5 | 2.05 | 18 | 0 |
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| 2012 | 59.5 | 29 | 78.1 | 17 | 40.8 | 114 | 0.19 | 129 | 0 |
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| 2011 | 60.5 | 24 | 79.6 | 9 | 41.4 | 97 | 0.27 | 125 | 0 |
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| 2010 | 55.7 | 94 | 68.5 | 107 | 42.9 | 61 | 1.72 | 29 | 0 |
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| 2009 | 62.9 | 8 | 82.5 | 1 | 43.3 | 51 | 0.84 | 79 | 0 |
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| 2008 | 55.4 | 100 | 70.9 | 79 | 39.9 | 130 | 1.10 | 62 | 0 |
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| 2007 | 55.9 | 90 | 71.1 | 77 | 40.7 | 115 | 1.73 | 28 | 0 |
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| 2006 | 57.4 | 62 | 73.1 | 50 | 41.7 | 88 | 1.13 | 61 | 0 |
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| 2005 | 56.6 | 81 | 72.2 | 62 | 40.9 | 110 | 0.50 | 104 | 0 |
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| 2004 | 56.1 | 87 | 69.6 | 95 | 42.6 | 66 | 1.36 | 47 | 0 |
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| 2003 | 55.9 | 90 | 70.6 | 82 | 41.1 | 105 | 1.36 | 47 | 0 |
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| 2002 | 56.7 | 80 | 71.2 | 76 | 42.2 | 75 | 1.16 | 59 | 0 |
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| 2001 | 60.7 | 22 | 78.2 | 16 | 43.2 | 55 | 0.33 | 120 | 0 |
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| 2000 | 56.8 | 77 | 72.2 | 62 | 41.5 | 92 | 0.93 | 73 | 0 |
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| 1999 | 54 | 122 | 68.4 | 109 | 39.6 | 132 | 1.21 | 54 | 0 |
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| 1998 | 63.7 | 3 | 80.2 | 7 | 47.3 | 6 | 0.33 | 120 | 0 |
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| 1997 | 60.6 | 23 | 79 | 13 | 42.2 | 75 | 0.39 | 115 | 0 |
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| 1996 | 55.1 | 103 | 67.9 | 112 | 42.2 | 75 | 1.58 | 37 | 0 |
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| 1995 | 56 | 88 | 71.5 | 69 | 40.5 | 118 | 0.67 | 92 | 0 |
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| 1994 | 61.6 | 14 | 79.3 | 10 | 43.8 | 44 | 0.11 | 142 | 0 |
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| 1993 | 53.3 | 125 | 67.3 | 118 | 39.3 | 135 | 0.75 | 85 | 0 |
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| 1992 | 54.8 | 111 | 70.3 | 88 | 39.2 | 136 | 0.59 | 99 | 0 |
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| 1991 | 57.8 | 53 | 72.7 | 53 | 42.8 | 64 | 0.28 | 123 | 0 |
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| 1990 | 63.2 | 7 | 80.8 | 4 | 45.5 | 15 | 0.04 | 147 | 0 |
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| 1989 | 55.5 | 97 | 69.3 | 97 | 41.8 | 85 | 0.95 | 70 | 0 |
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| 1988 | 56 | 88 | 70.5 | 84 | 41.5 | 92 | 1.48 | 40 | 0 |
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| 1987 | 58.6 | 42 | 75.9 | 26 | 41.3 | 100 | 0.74 | 87 | 0 |
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| 1986 | 51 | 138 | 58.7 | 144 | 43.2 | 55 | 5.76 | 2 | 0 |
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| 1985 | 48.9 | 144 | 58.3 | 145 | 39.5 | 134 | 3.11 | 8 | 0 |
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| 1984 | 50.2 | 142 | 63.1 | 137 | 37.3 | 143 | 0.70 | 89 | 0 |
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| 1983 | 53.7 | 123 | 67.3 | 118 | 40.1 | 126 | 0.83 | 81 | 0 |
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| 1982 | 55.1 | 103 | 69.1 | 100 | 41 | 109 | 1.22 | 53 | 0 |
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| 1981 | 59.2 | 34 | 76.1 | 25 | 42.2 | 75 | 0.69 | 90 | 0 |
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| 1980 | 57.5 | 60 | 72.3 | 60 | 42.6 | 66 | 0.45 | 109 | 0 |
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| 1979 | 62.7 | 10 | 80 | 8 | 45.3 | 18 | 0.65 | 95 | 0 |
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| 1978 | 59.3 | 32 | 72.8 | 52 | 45.7 | 14 | 2.59 | 10 | 0 |
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| 1977 | 57.3 | 64 | 71.4 | 72 | 43.2 | 55 | 1.74 | 25 | 0 |
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| 1976 | 61.3 | 17 | 80.3 | 6 | 42.3 | 73 | 0.13 | 140 | 0 |
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| 1975 | 56.4 | 85 | 71.7 | 67 | 41.2 | 103 | 0.52 | 103 | 0 |
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| 1974 | 55 | 107 | 71.3 | 73 | 38.6 | 141 | 0.11 | 142 | 0 |
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| 1973 | 57.4 | 62 | 71.3 | 73 | 43.5 | 47 | 0.88 | 77 | 0 |
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| 1972 | 52.9 | 128 | 66.7 | 122 | 39.1 | 138 | 1.17 | 57 | 0 |
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| 1971 | 54.6 | 115 | 69.2 | 99 | 40 | 128 | 0.15 | 135 | 0 |
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| 1970 | 55.4 | 100 | 70.4 | 86 | 40.4 | 121 | 0.60 | 98 | 0 |
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| 1969 | 60.8 | 20 | 77.5 | 19 | 44.2 | 35 | 0.07 | 144 | 0 |
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| 1968 | 55.9 | 90 | 69.4 | 96 | 42.4 | 72 | 2.47 | 13 | 0 |
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| 1967 | 62.6 | 11 | 78.8 | 14 | 46.3 | 8 | 1.77 | 24 | 0 |
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| 1966 | 61.4 | 15 | 77.3 | 20 | 45.5 | 15 | 0.17 | 132 | 0 |
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| 1965 | 46.2 | 147 | 56.2 | 147 | 36.1 | 147 | 2.45 | 14 | 0 |
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| 1964 | 52.5 | 132 | 64 | 135 | 40.9 | 110 | 1.49 | 39 | 0 |
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| 1963 | 63.7 | 3 | 79.2 | 11 | 48.3 | 3 | 0.36 | 118 | 0 |
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| 1962 | 55.6 | 96 | 72.4 | 57 | 38.7 | 140 | 0.74 | 87 | 0 |
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| 1961 | 50.8 | 140 | 64.3 | 132 | 37.2 | 144 | 1.26 | 52 | 0 |
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| 1960 | 59.3 | 32 | 75.6 | 27 | 42.9 | 61 | 0.19 | 129 | 0 |
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| 1959 | 54.5 | 117 | 67.6 | 117 | 41.4 | 97 | 0.66 | 93 | 0 |
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| 1958 | 58.6 | 42 | 72.5 | 56 | 44.7 | 30 | 0.54 | 102 | 0 |
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| 1957 | 58.5 | 45 | 72.1 | 66 | 44.8 | 28 | 0.98 | 67 | 0 |
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| 1956 | 58.1 | 49 | 72.2 | 62 | 44 | 38 | 1.19 | 56 | 0 |
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| 1955 | 54.7 | 112 | 68.9 | 101 | 40.4 | 121 | 0.18 | 131 | 0 |
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| 1954 | 57 | 70 | 68.8 | 103 | 45.2 | 20 | 3.28 | 6 | 0 |
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| 1953 | 60.2 | 26 | 75.2 | 31 | 45.2 | 20 | 0.75 | 85 | 0 |
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| 1952 | 61.4 | 15 | 76.6 | 23 | 46.1 | 11 | 0.28 | 123 | 0 |
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| 1951 | 53.2 | 126 | 65 | 129 | 41.4 | 97 | 1.36 | 47 | 0 |
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| 1950 | 56.9 | 74 | 71.5 | 69 | 42.3 | 73 | 0.93 | 73 | 0 |
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| 1949 | 58 | 51 | 74.2 | 36 | 41.8 | 85 | 0.14 | 136 | 0 |
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| 1948 | 60.2 | 26 | 75.6 | 27 | 44.7 | 30 | 0.14 | 136 | 0 |
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| 1947 | 56.9 | 74 | 68.3 | 111 | 45.4 | 17 | 1.74 | 25 | 0 |
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| 1946 | 56.2 | 86 | 69.3 | 97 | 43.1 | 58 | 1.64 | 33 | 0 |
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| 1945 | 54.1 | 120 | 66.9 | 121 | 41.3 | 100 | 3.17 | 7 | 0 |
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| 1944 | 59 | 37 | 73.1 | 50 | 44.9 | 26 | 0.27 | 125 | 0 |
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| 1943 | 57.5 | 60 | 74.5 | 34 | 40.5 | 118 | 0.14 | 136 | 0 |
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| 1942 | 57.6 | 58 | 71.1 | 77 | 44.1 | 37 | 0.95 | 70 | 0 |
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| 1941 | 52.7 | 129 | 64.2 | 134 | 41.2 | 103 | 3.53 | 5 | 0 |
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| 1940 | 64.2 | 2 | 78.1 | 17 | 50.2 | 1 | 1.47 | 41 | 0 |
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| 1939 | 59.2 | 34 | 73.6 | 44 | 44.9 | 26 | 0.90 | 76 | 0 |
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| 1938 | 65.6 | 1 | 82.4 | 2 | 48.7 | 2 | 1.34 | 50 | 0 |
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| 1937 | 58.4 | 46 | 72.2 | 62 | 44.6 | 32 | 1.07 | 63 | 0 |
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| 1936 | 58.3 | 48 | 73.2 | 49 | 43.5 | 47 | 0.14 | 136 | 0 |
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| 1935 | 57.7 | 55 | 73.8 | 41 | 41.5 | 92 | 0.17 | 132 | 0 |
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| 1934 | 51.3 | 137 | 63.9 | 136 | 38.8 | 139 | 1.74 | 25 | 0 |
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| 1933 | 57.2 | 65 | 70.5 | 84 | 44 | 38 | 0.45 | 109 | 0 |
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| 1932 | 57.2 | 65 | 72.7 | 53 | 41.7 | 88 | 0.38 | 116 | 1 |
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| 1931 | 58.8 | 38 | 72.4 | 57 | 45.2 | 20 | 0.47 | 108 | 0 |
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| 1930 | 57.9 | 52 | 71.3 | 73 | 44.2 | 35 | 1.39 | 45 | 1 |
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| 1929 | 52.5 | 132 | 65.7 | 127 | 39.2 | 136 | 1.46 | 43 | 0 |
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| 1928 | 55.8 | 93 | 70.8 | 80 | 40.9 | 110 | 0.42 | 112 | 0 |
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| 1927 | 55.1 | 103 | 68.5 | 107 | 41.7 | 88 | 0.55 | 101 | 0 |
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| 1926 | 47.4 | 146 | 57.8 | 146 | 37 | 145 | 2.57 | 11 | 0 |
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| 1925 | 54.9 | 109 | 66 | 126 | 43.8 | 44 | 3.94 | 4 | 0 |
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| 1924 | 56.5 | 83 | 73.4 | 45 | 39.8 | 131 | 0.64 | 97 | 1 |
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| 1923 | 57.8 | 53 | 73.8 | 41 | 42.2 | 75 | 0.50 | 104 | 1 |
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| 1922 | 60.9 | 18 | 75.5 | 29 | 46.2 | 9 | 0.68 | 91 | 0 |
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| 1921 | 52.5 | 132 | 64.7 | 131 | 40.4 | 121 | 1.50 | 38 | 0 |
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| 1920 | 58.7 | 41 | 73.4 | 45 | 44 | 38 | 0.34 | 119 | 0 |
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| 1919 | 57 | 70 | 70 | 90 | 44 | 38 | 0.78 | 84 | 0 |
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| 1918 | 55.2 | 102 | 69.9 | 93 | 40.4 | 121 | 0.98 | 67 | 0 |
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| 1917 | 56.5 | 83 | 70.2 | 89 | 42.9 | 61 | 4.58 | 3 | 0 |
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| 1916 | 55.5 | 97 | 68.7 | 106 | 42.2 | 75 | 1.42 | 44 | 0 |
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| 1915 | 51.8 | 136 | 62.6 | 138 | 40.9 | 110 | 2.05 | 18 | 0 |
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| 1914 | 56.8 | 77 | 70.6 | 82 | 43 | 59 | 1.37 | 46 | 0 |
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| 1913 | 57 | 70 | 73.4 | 45 | 40.6 | 117 | 0.82 | 83 | 0 |
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| 1912 | 48.6 | 145 | 60.8 | 142 | 36.5 | 146 | 1.20 | 55 | 0 |
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| 1911 | 52.6 | 131 | 62.6 | 138 | 42.6 | 66 | 5.99 | 1 | 0 |
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| 1910 | 54.7 | 112 | 68.4 | 109 | 41.1 | 105 | 0.48 | 106 | 0 |
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| 1909 | 60.5 | 24 | 75 | 32 | 45.9 | 13 | 0.94 | 72 | 0 |
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| 1908 | 58.8 | 38 | 74 | 40 | 43.7 | 46 | 1.17 | 57 | 0 |
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| 1907 | 54.4 | 118 | 67.8 | 116 | 41.1 | 105 | 0.83 | 81 | 0 |
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| 1906 | 59.5 | 29 | 74.2 | 36 | 44.8 | 28 | 0.93 | 73 | 0 |
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| 1905 | 60.2 | 26 | 74.1 | 38 | 46.2 | 9 | 0.12 | 141 | 0 |
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| 1904 | 56.6 | 81 | 72.6 | 55 | 40.5 | 118 | 0.26 | 127 | 0 |
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| 1903 | 54.3 | 119 | 67.1 | 120 | 41.5 | 92 | 0.48 | 106 | 0 |
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| 1902 | 55.5 | 97 | 70.7 | 81 | 40.3 | 125 | 0.42 | 112 | 0 |
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| 1901 | 50.5 | 141 | 59.9 | 143 | 41.1 | 105 | 2.00 | 20 | 0 |
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| 1900 | 53.4 | 124 | 64.3 | 132 | 42.6 | 66 | 2.21 | 15 | 0 |
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| 1899 | 58.8 | 38 | 74.1 | 38 | 43.5 | 47 | 0.20 | 128 | 0 |
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| 1898 | 57.7 | 55 | 72.4 | 57 | 43 | 59 | 1.06 | 65 | 0 |
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| 1897 | 59.4 | 31 | 75.5 | 29 | 43.3 | 51 | 0.66 | 93 | 0 |
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| 1896 | 52.5 | 132 | 64.8 | 130 | 40.1 | 126 | 1.63 | 35 | 0 |
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| 1895 | 52.7 | 129 | 65.3 | 128 | 40 | 128 | 1.05 | 66 | 0 |
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| 1894 | 54.9 | 109 | 67.9 | 112 | 41.8 | 85 | 1.70 | 30 | 0 |
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| 1893 | 54.7 | 112 | 67.9 | 112 | 41.5 | 92 | 1.67 | 31 | 0 |
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| 1892 | 58.4 | 46 | 74.8 | 33 | 42 | 82 | 0.44 | 111 | 0 |
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| 1891 | 57.6 | 58 | 70 | 90 | 45.1 | 23 | 0.87 | 78 | 0 |
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| 1890 | 55.7 | 94 | 68.8 | 103 | 42.5 | 71 | 1.87 | 21 | 0 |
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| 1889 | 53.1 | 127 | 66.6 | 123 | 39.6 | 132 | 0.57 | 100 | 0 |
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| 1888 | 60.8 | 20 | 76.3 | 24 | 45.3 | 18 | 0.41 | 114 | 0 |
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| 1887 | 57.2 | 65 | 69.8 | 94 | 44.6 | 32 | 1.14 | 60 | 0 |
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| 1886 | 54.1 | 120 | 66.6 | 123 | 41.6 | 91 | 1.47 | 41 | 0 |
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| 1885 | 58.1 | 49 | 72.3 | 60 | 43.9 | 42 | 0.17 | 132 | 0 |
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| 1884 | 51 | 138 | 61.3 | 141 | 40.7 | 115 | 2.69 | 9 | 0 |
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| 1883 | 55 | 107 | 67.9 | 112 | 42.2 | 75 | 0.65 | 95 | 0 |
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| 1882 | 56.9 | 74 | 68.8 | 103 | 45 | 24 | 2.19 | 16 | 0 |
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| 1881 | 50.1 | 143 | 61.6 | 140 | 38.6 | 141 | 1.64 | 33 | 0 |
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| 1880 | 55.1 | 103 | 68.9 | 101 | 41.3 | 100 | 0.37 | 117 | 0 |
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