Every summer in Glasgow, MT from 1894 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 | 69.1 | 47 | 82.1 | 74 | 56.2 | 16 | 6.96 | 33 | 0 |
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| 2025 | 69 | 51 | 82.2 | 73 | 55.8 | 21 | 7.12 | 31 | 0 |
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| 2024 | 71.3 | 12 | 85.4 | 23 | 57.2 | 9 | 3.79 | 87 | 0 |
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| 2023 | 72 | 6 | 85.8 | 19 | 58.1 | 5 | 3.58 | 93 | 0 |
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| 2022 | 72.8 | 5 | 87.5 | 11 | 58.2 | 4 | 3.67 | 92 | 0 |
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| 2021 | 74.3 | 1 | 89.3 | 2 | 59.3 | 1 | 2.93 | 109 | 0 |
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| 2020 | 70.3 | 25 | 85 | 31 | 55.6 | 28 | 4.38 | 77 | 0 |
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| 2019 | 69.2 | 45 | 82.3 | 70 | 56.2 | 16 | 7.18 | 29 | 0 |
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| 2018 | 70.7 | 19 | 85 | 31 | 56.4 | 13 | 3.10 | 108 | 0 |
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| 2017 | 70.9 | 18 | 86.2 | 15 | 55.6 | 28 | 1.11 | 128 | 0 |
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| 2016 | 68.3 | 67 | 81.7 | 83 | 54.9 | 47 | 7.45 | 28 | 0 |
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| 2015 | 69.8 | 31 | 84.4 | 40 | 55.3 | 38 | 5.17 | 64 | 0 |
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| 2014 | 67.8 | 74 | 81.3 | 88 | 54.2 | 65 | 9.56 | 11 | 0 |
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| 2013 | 68.8 | 54 | 81.9 | 77 | 55.7 | 24 | 5.32 | 62 | 0 |
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| 2012 | 70.7 | 19 | 85.7 | 20 | 55.7 | 24 | 5.12 | 65 | 0 |
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| 2011 | 68.5 | 65 | 81.5 | 85 | 55.4 | 34 | 10.61 | 5 | 0 |
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| 2010 | 67.4 | 88 | 80.8 | 97 | 54.1 | 67 | 8.43 | 20 | 0 |
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| 2009 | 66.4 | 103 | 80.6 | 100 | 52.1 | 101 | 5.38 | 60 | 0 |
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| 2008 | 67.6 | 80 | 81.8 | 80 | 53.3 | 83 | 5.88 | 54 | 0 |
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| 2007 | 71.6 | 9 | 85.1 | 28 | 58.1 | 5 | 4.19 | 80 | 0 |
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| 2006 | 71.8 | 8 | 86.9 | 13 | 56.8 | 11 | 1.73 | 126 | 0 |
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| 2005 | 68.4 | 66 | 82.4 | 66 | 54.3 | 60 | 4.95 | 68 | 0 |
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| 2004 | 64.1 | 126 | 77.2 | 125 | 51.1 | 115 | 5.50 | 57 | 0 |
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| 2003 | 71.2 | 14 | 85.6 | 21 | 56.7 | 12 | 4.29 | 79 | 0 |
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| 2002 | 67.5 | 85 | 80.4 | 104 | 54.7 | 50 | 8.24 | 22 | 0 |
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| 2001 | 68.8 | 54 | 81.9 | 77 | 55.6 | 28 | 10.18 | 8 | 0 |
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| 2000 | 68 | 71 | 81.8 | 80 | 54.3 | 60 | 6.65 | 41 | 0 |
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| 1999 | 67 | 96 | 80.2 | 107 | 53.8 | 72 | 5.99 | 49 | 0 |
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| 1998 | 69.5 | 37 | 83 | 56 | 56 | 18 | 5.99 | 49 | 0 |
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| 1997 | 69.1 | 47 | 82.8 | 60 | 55.5 | 31 | 6.70 | 40 | 0 |
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| 1996 | 69.4 | 40 | 84.2 | 42 | 54.6 | 53 | 2.75 | 111 | 0 |
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| 1995 | 67.6 | 80 | 80.9 | 95 | 54.4 | 57 | 7.85 | 25 | 0 |
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| 1994 | 68 | 71 | 81.9 | 77 | 54 | 68 | 3.80 | 86 | 0 |
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| 1993 | 62.8 | 128 | 74.3 | 128 | 51.4 | 111 | 12.20 | 2 | 0 |
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| 1992 | 65.1 | 121 | 78 | 122 | 52.2 | 99 | 5.40 | 59 | 0 |
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| 1991 | 70.6 | 22 | 83.5 | 50 | 57.8 | 8 | 5.94 | 52 | 0 |
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| 1990 | 69.6 | 35 | 83.6 | 47 | 55.5 | 31 | 3.22 | 104 | 0 |
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| 1989 | 69.8 | 31 | 83.6 | 47 | 56 | 18 | 3.38 | 98 | 0 |
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| 1988 | 73.5 | 3 | 88.3 | 6 | 58.7 | 2 | 3.29 | 101 | 0 |
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| 1987 | 67.6 | 80 | 80.9 | 95 | 54.3 | 60 | 4.85 | 70 | 0 |
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| 1986 | 69.1 | 47 | 82.9 | 57 | 55.4 | 34 | 3.98 | 83 | 0 |
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| 1985 | 65.8 | 108 | 79.1 | 118 | 52.6 | 92 | 6.52 | 43 | 0 |
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| 1984 | 71.2 | 14 | 84.6 | 38 | 57.9 | 7 | 2.43 | 117 | 0 |
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| 1983 | 70.6 | 22 | 84.8 | 35 | 56.4 | 13 | 3.42 | 97 | 0 |
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| 1982 | 67.1 | 93 | 80.7 | 98 | 53.6 | 75 | 3.19 | 106 | 0 |
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| 1981 | 68.6 | 64 | 82.6 | 62 | 54.5 | 55 | 3.78 | 88 | 0 |
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| 1980 | 67.7 | 79 | 81.6 | 84 | 53.7 | 73 | 4.35 | 78 | 0 |
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| 1979 | 68.7 | 62 | 82.5 | 64 | 54.9 | 47 | 1.99 | 124 | 0 |
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| 1978 | 65.2 | 120 | 78.6 | 120 | 51.9 | 103 | 5.51 | 56 | 0 |
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| 1977 | 65.3 | 117 | 78.6 | 120 | 51.9 | 103 | 2.52 | 115 | 0 |
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| 1976 | 67.6 | 80 | 80.4 | 104 | 54.9 | 47 | 10.43 | 6 | 0 |
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| 1975 | 66.9 | 98 | 80.2 | 107 | 53.5 | 78 | 6.75 | 39 | 0 |
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| 1974 | 67.8 | 74 | 81.4 | 87 | 54.3 | 60 | 7.00 | 32 | 0 |
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| 1973 | 69.5 | 37 | 83.6 | 47 | 55.3 | 38 | 6.15 | 48 | 0 |
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| 1972 | 67.1 | 93 | 80.3 | 106 | 53.9 | 70 | 8.47 | 19 | 0 |
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| 1971 | 70.4 | 24 | 84.9 | 34 | 55.8 | 21 | 2.24 | 121 | 0 |
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| 1970 | 70.7 | 19 | 85.6 | 21 | 55.9 | 20 | 3.54 | 94 | 0 |
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| 1969 | 66 | 107 | 79.7 | 113 | 52.3 | 96 | 4.73 | 72 | 0 |
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| 1968 | 64.8 | 122 | 78 | 122 | 51.7 | 105 | 5.06 | 66 | 0 |
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| 1967 | 67.4 | 88 | 81.8 | 80 | 53 | 87 | 2.53 | 113 | 0 |
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| 1966 | 66.5 | 102 | 79.3 | 117 | 53.6 | 75 | 7.67 | 26 | 0 |
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| 1965 | 67.5 | 85 | 79.6 | 116 | 55.4 | 34 | 8.56 | 18 | 0 |
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| 1964 | 68.8 | 54 | 82.4 | 66 | 55.1 | 43 | 4.83 | 71 | 0 |
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| 1963 | 68.8 | 54 | 81.3 | 88 | 56.4 | 13 | 10.31 | 7 | 0 |
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| 1962 | 66.6 | 101 | 78.8 | 119 | 54.4 | 57 | 11.47 | 3 | 0 |
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| 1961 | 73.2 | 4 | 87.6 | 9 | 58.7 | 2 | 3.21 | 105 | 0 |
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| 1960 | 68.8 | 54 | 82.7 | 61 | 55 | 46 | 3.11 | 107 | 0 |
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| 1959 | 68.8 | 54 | 82.3 | 70 | 55.3 | 38 | 3.95 | 84 | 0 |
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| 1958 | 66.9 | 98 | 80 | 109 | 53.7 | 73 | 3.73 | 90 | 0 |
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| 1957 | 69.1 | 47 | 82.5 | 64 | 55.7 | 24 | 5.85 | 55 | 0 |
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| 1956 | 67.8 | 74 | 81.3 | 88 | 54.3 | 60 | 5.33 | 61 | 0 |
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| 1955 | 70.1 | 28 | 84.5 | 39 | 55.7 | 24 | 3.38 | 98 | 0 |
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| 1954 | 68 | 71 | 81.5 | 85 | 54.5 | 55 | 7.13 | 30 | 0 |
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| 1953 | 69.2 | 45 | 83.2 | 54 | 55.2 | 42 | 5.01 | 67 | 0 |
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| 1952 | 67.4 | 88 | 82.4 | 66 | 52.5 | 93 | 6.96 | 33 | 0 |
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| 1951 | 66.1 | 106 | 80.6 | 100 | 51.5 | 110 | 4.52 | 74 | 0 |
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| 1950 | 65.3 | 117 | 79.7 | 113 | 50.8 | 119 | 9.76 | 10 | 0 |
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| 1949 | 70 | 30 | 85.3 | 24 | 54.7 | 50 | 3.35 | 100 | 0 |
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| 1948 | 69.4 | 40 | 83.3 | 52 | 55.4 | 34 | 6.55 | 42 | 0 |
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| 1947 | 69.8 | 31 | 84.2 | 42 | 55.3 | 38 | 10.14 | 9 | 0 |
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| 1946 | 68.9 | 52 | 84 | 44 | 53.9 | 70 | 6.86 | 35 | 0 |
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| 1945 | 67.5 | 85 | 82.4 | 66 | 52.7 | 91 | 3.50 | 95 | 0 |
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| 1944 | 66.3 | 105 | 79.7 | 113 | 52.9 | 88 | 8.68 | 17 | 0 |
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| 1943 | 67 | 96 | 81.2 | 92 | 52.8 | 90 | 7.65 | 27 | 0 |
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| 1942 | 65.5 | 114 | 80.7 | 98 | 50.4 | 120 | 6.32 | 45 | 4 |
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| 1941 | 69.6 | 35 | 83.7 | 46 | 55.5 | 31 | 5.98 | 51 | 0 |
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| 1940 | 69.3 | 42 | 85.3 | 24 | 53.4 | 82 | 4.57 | 73 | 1 |
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| 1939 | 67.2 | 91 | 82.9 | 57 | 51.6 | 107 | 6.77 | 37 | 0 |
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| 1938 | 68.7 | 62 | 85 | 31 | 52.4 | 94 | 8.38 | 21 | 0 |
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| 1937 | 71.4 | 11 | 88.3 | 6 | 54.4 | 57 | 2.32 | 120 | 0 |
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| 1936 | 74.2 | 2 | 91.5 | 1 | 56.9 | 10 | 2.59 | 112 | 2 |
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| 1935 | 68.8 | 54 | 84.7 | 37 | 52.9 | 88 | 5.29 | 63 | 0 |
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| 1934 | 68.8 | 54 | 85.2 | 26 | 52.4 | 94 | 3.82 | 85 | 0 |
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| 1933 | 71.6 | 9 | 88.5 | 5 | 55.1 | 43 | 8.06 | 23 | 2 |
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| 1932 | 69.5 | 37 | 84.4 | 40 | 54.6 | 53 | 8.06 | 23 | 1 |
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| 1931 | 70.3 | 25 | 86.3 | 14 | 54.2 | 65 | 5.93 | 53 | 0 |
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| 1930 | 71.2 | 14 | 87.6 | 9 | 54.7 | 50 | 1.93 | 125 | 0 |
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| 1929 | 70.2 | 27 | 88.1 | 8 | 52.3 | 96 | 4.10 | 81 | 0 |
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| 1928 | 65.5 | 114 | 80.5 | 102 | 50.4 | 120 | 6.77 | 37 | 1 |
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| 1927 | 66.9 | 98 | 82.3 | 70 | 51.6 | 107 | 6.32 | 45 | 1 |
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| 1926 | 68.9 | 52 | 86 | 17 | 51.7 | 105 | 4.40 | 76 | 0 |
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| 1925 | 68.1 | 70 | 85.2 | 26 | 51.1 | 115 | 3.27 | 103 | 0 |
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| 1924 | 65.6 | 111 | 81 | 93 | 50.2 | 123 | 8.95 | 13 | 0 |
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| 1923 | 68.3 | 67 | 83.1 | 55 | 53.5 | 78 | 14.11 | 1 | 0 |
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| 1922 | 69.3 | 42 | 85.1 | 28 | 53.5 | 78 | 5.44 | 58 | 2 |
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| 1921 | 71 | 17 | 86.1 | 16 | 55.8 | 21 | 9.07 | 12 | 0 |
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| 1920 | 69.8 | 31 | 86 | 17 | 53.5 | 78 | 4.95 | 68 | 0 |
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| 1919 | 72 | 6 | 88.9 | 4 | 55.1 | 43 | 3.71 | 91 | 0 |
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| 1918 | 69.3 | 42 | 85.1 | 28 | 53.6 | 75 | 6.82 | 36 | 0 |
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| 1917 | 67.8 | 74 | 83.9 | 45 | 51.6 | 107 | 2.43 | 117 | 0 |
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| 1916 | 65.5 | 114 | 79.9 | 110 | 51.2 | 113 | 8.82 | 15 | 1 |
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| 1915 | 64.3 | 125 | 77.4 | 124 | 51.2 | 113 | 6.39 | 44 | 0 |
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| 1914 | 68.2 | 69 | 83.3 | 52 | 53.1 | 86 | 10.65 | 4 | 1 |
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| 1913 | 67.1 | 93 | 82 | 76 | 52.2 | 99 | 4.52 | 74 | 0 |
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| 1912 | 63.9 | 127 | 76.4 | 127 | 51.4 | 111 | 8.84 | 14 | 0 |
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| 1911 | 65.6 | 111 | 81.3 | 88 | 49.9 | 125 | 2.82 | 110 | 2 |
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| 1907 | 64.6 | 123 | 79.9 | 110 | 49.2 | 127 | 6.22 | 47 | 0 |
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| 1906 | 65.6 | 111 | 77.2 | 125 | 54 | 68 | 8.72 | 16 | 1 |
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| 1905 | | | | | | | | | 31 |
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| 1904 | 65.8 | 108 | 82.6 | 62 | 49.3 | 126 | 2.36 | 119 | 6 |
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| 1903 | 65.8 | 108 | 80.5 | 102 | 51.1 | 115 | 2.46 | 116 | 1 |
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| 1902 | 64.6 | 123 | 81 | 93 | 48.2 | 128 | 2.12 | 123 | 0 |
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| 1901 | | | | | | | | | 31 |
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| 1900 | 70.1 | 28 | 87 | 12 | 53.2 | 85 | 1.28 | 127 | 0 |
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| 1899 | 65.3 | 117 | 79.8 | 112 | 50.9 | 118 | 3.28 | 102 | 0 |
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| 1898 | 67.2 | 91 | 82.1 | 74 | 52.3 | 96 | 4.06 | 82 | 0 |
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| 1897 | 67.6 | 80 | 84.8 | 35 | 50.4 | 120 | 2.53 | 113 | 0 |
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| 1896 | 67.8 | 74 | 83.5 | 50 | 52.1 | 101 | 3.76 | 89 | 0 |
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| 1895 | 66.4 | 103 | 82.9 | 57 | 50 | 124 | 3.43 | 96 | 0 |
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| 1894 | 71.3 | 12 | 89.3 | 2 | 53.3 | 83 | 2.23 | 122 | 0 |
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