Every May in Des Moines, IA from 1879 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 | 63.8 | 44 | 75.1 | 35 | 52.5 | 58 | 2.53 | 117 | 0 |
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| 2025 | 61.5 | 75 | 72.6 | 64 | 50.5 | 92 | 5.37 | 42 | 0 |
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| 2024 | 65.6 | 25 | 76.5 | 23 | 54.8 | 26 | 6.05 | 27 | 0 |
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| 2023 | 65.9 | 20 | 77.4 | 16 | 54.5 | 32 | 3.36 | 93 | 0 |
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| 2022 | 63.8 | 44 | 73 | 59 | 54.6 | 29 | 2.97 | 103 | 0 |
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| 2021 | 60.8 | 89 | 70.1 | 104 | 51.6 | 75 | 2.81 | 111 | 0 |
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| 2020 | 60.1 | 104 | 68.5 | 125 | 51.8 | 70 | 5.57 | 39 | 0 |
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| 2019 | 59.5 | 112 | 69.1 | 119 | 49.9 | 103 | 9.50 | 5 | 0 |
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| 2018 | 71 | 2 | 81.5 | 2 | 60.5 | 1 | 5.49 | 41 | 0 |
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| 2017 | 62.9 | 55 | 73.8 | 47 | 52 | 68 | 4.83 | 53 | 0 |
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| 2016 | 63 | 54 | 73.2 | 53 | 52.9 | 50 | 4.12 | 71 | 0 |
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| 2015 | 63.8 | 44 | 72.6 | 64 | 55 | 21 | 4.33 | 65 | 0 |
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| 2014 | 64.1 | 40 | 74.6 | 42 | 53.6 | 38 | 3.40 | 91 | 0 |
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| 2013 | 62 | 67 | 71 | 85 | 52.9 | 50 | 7.26 | 15 | 0 |
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| 2012 | 68.5 | 5 | 79.5 | 7 | 57.5 | 8 | 3.15 | 99 | 0 |
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| 2011 | 62.9 | 55 | 72.9 | 60 | 52.9 | 50 | 6.04 | 28 | 0 |
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| 2010 | 62.9 | 55 | 72.7 | 62 | 53 | 48 | 4.79 | 55 | 0 |
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| 2009 | 62.8 | 58 | 72.9 | 60 | 52.8 | 53 | 3.79 | 84 | 0 |
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| 2008 | 60.4 | 97 | 71.2 | 82 | 49.6 | 107 | 3.84 | 82 | 0 |
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| 2007 | 66.3 | 17 | 76.3 | 24 | 56.4 | 11 | 5.94 | 30 | 0 |
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| 2006 | 63.4 | 50 | 73.5 | 50 | 53.4 | 45 | 1.41 | 142 | 0 |
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| 2005 | 60.2 | 103 | 70.9 | 86 | 49.5 | 109 | 5.16 | 48 | 0 |
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| 2004 | 63.6 | 48 | 73.8 | 47 | 53.5 | 40 | 7.40 | 14 | 0 |
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| 2003 | 61.2 | 78 | 71.1 | 83 | 51.4 | 80 | 5.34 | 45 | 0 |
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| 2002 | 59.3 | 114 | 70.3 | 100 | 48.2 | 120 | 3.24 | 97 | 0 |
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| 2001 | 61.7 | 71 | 70.7 | 91 | 52.7 | 56 | 7.45 | 13 | 0 |
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| 2000 | 64.8 | 31 | 75.8 | 29 | 53.8 | 37 | 3.37 | 92 | 0 |
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| 1999 | 61.3 | 76 | 70.3 | 100 | 52.2 | 65 | 5.82 | 34 | 0 |
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| 1998 | 66.5 | 15 | 76.2 | 25 | 56.7 | 10 | 4.97 | 51 | 0 |
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| 1997 | 55.8 | 142 | 66.7 | 137 | 45 | 146 | 3.95 | 75 | 0 |
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| 1996 | 57.7 | 129 | 65.2 | 143 | 50.2 | 99 | 12.13 | 1 | 0 |
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| 1995 | 58.9 | 119 | 67.9 | 129 | 49.9 | 103 | 6.29 | 26 | 0 |
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| 1994 | 62.5 | 64 | 74.2 | 45 | 50.7 | 88 | 1.76 | 134 | 0 |
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| 1993 | 60.9 | 85 | 70.4 | 96 | 51.5 | 77 | 7.51 | 12 | 0 |
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| 1992 | 61.9 | 68 | 73.5 | 50 | 50.4 | 94 | 1.45 | 140 | 0 |
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| 1991 | 66.7 | 13 | 75.5 | 30 | 57.9 | 5 | 7.88 | 9 | 0 |
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| 1990 | 57.8 | 127 | 68 | 127 | 47.7 | 125 | 4.36 | 62 | 0 |
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| 1989 | 60.9 | 85 | 72.6 | 64 | 49.3 | 113 | 3.62 | 86 | 0 |
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| 1988 | 67.4 | 10 | 80.1 | 5 | 54.6 | 29 | 1.46 | 139 | 0 |
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| 1987 | 66.7 | 13 | 78.7 | 9 | 54.8 | 26 | 3.75 | 85 | 0 |
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| 1986 | 62.6 | 63 | 72.6 | 64 | 52.5 | 58 | 4.35 | 63 | 0 |
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| 1985 | 65.1 | 28 | 76.7 | 20 | 53.5 | 40 | 1.56 | 138 | 0 |
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| 1984 | 58.6 | 122 | 69.3 | 115 | 48 | 121 | 5.58 | 38 | 0 |
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| 1983 | 58.4 | 123 | 68.1 | 126 | 48.6 | 118 | 3.93 | 78 | 0 |
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| 1982 | 64.7 | 32 | 73.2 | 53 | 56.2 | 13 | 5.79 | 35 | 0 |
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| 1981 | 60.4 | 97 | 71.1 | 83 | 49.6 | 107 | 2.46 | 119 | 0 |
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| 1980 | 63.5 | 49 | 75.2 | 34 | 51.7 | 71 | 1.94 | 131 | 0 |
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| 1979 | 61 | 82 | 72.7 | 62 | 49.4 | 112 | 2.50 | 118 | 0 |
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| 1978 | 61.6 | 74 | 70.7 | 91 | 52.5 | 58 | 3.49 | 89 | 0 |
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| 1977 | 69.5 | 3 | 80.2 | 4 | 58.7 | 3 | 2.29 | 123 | 0 |
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| 1976 | 60.7 | 92 | 71.6 | 75 | 49.8 | 105 | 2.84 | 108 | 0 |
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| 1975 | 65.9 | 20 | 76.9 | 18 | 54.8 | 26 | 3.41 | 90 | 0 |
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| 1974 | 60.3 | 100 | 68.9 | 121 | 51.7 | 71 | 7.19 | 16 | 0 |
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| 1973 | 59.8 | 109 | 70.1 | 104 | 49.5 | 109 | 5.01 | 50 | 0 |
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| 1972 | 62.5 | 64 | 72.6 | 64 | 52.4 | 62 | 3.05 | 101 | 0 |
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| 1971 | 58.7 | 120 | 69.7 | 109 | 47.7 | 125 | 3.87 | 80 | 0 |
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| 1970 | 65.8 | 24 | 76.6 | 21 | 54.9 | 23 | 4.21 | 68 | 0 |
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| 1969 | 62.8 | 58 | 73.2 | 53 | 52.5 | 58 | 4.75 | 58 | 0 |
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| 1968 | 57 | 135 | 67.4 | 132 | 46.6 | 136 | 2.62 | 116 | 0 |
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| 1967 | 57.1 | 133 | 67.6 | 131 | 46.5 | 139 | 2.22 | 124 | 0 |
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| 1966 | 57.7 | 129 | 69.2 | 116 | 46.2 | 142 | 5.37 | 42 | 0 |
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| 1965 | 66.1 | 18 | 76.9 | 18 | 55.4 | 18 | 3.89 | 79 | 0 |
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| 1964 | 64.3 | 37 | 75 | 37 | 53.6 | 38 | 2.90 | 106 | 0 |
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| 1963 | 59.7 | 110 | 69.1 | 119 | 50.3 | 95 | 3.94 | 76 | 0 |
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| 1962 | 69.2 | 4 | 79.2 | 8 | 59.2 | 2 | 6.02 | 29 | 0 |
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| 1961 | 58.7 | 120 | 69.6 | 112 | 47.8 | 123 | 1.58 | 137 | 0 |
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| 1960 | 61 | 82 | 71.8 | 73 | 50.2 | 99 | 7.53 | 11 | 0 |
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| 1959 | 62.8 | 58 | 72.4 | 71 | 53.3 | 46 | 6.63 | 22 | 0 |
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| 1958 | 63.9 | 43 | 76.2 | 25 | 51.6 | 75 | 3.59 | 88 | 0 |
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| 1957 | 59.9 | 106 | 69.7 | 109 | 50 | 102 | 5.36 | 44 | 0 |
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| 1956 | 63.4 | 50 | 75 | 37 | 51.7 | 71 | 1.71 | 135 | 0 |
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| 1955 | 64.7 | 32 | 75.9 | 28 | 53.5 | 40 | 2.93 | 105 | 0 |
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| 1954 | 56.7 | 137 | 67.8 | 130 | 45.7 | 144 | 5.90 | 31 | 0 |
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| 1953 | 60.3 | 100 | 70.5 | 94 | 50.2 | 99 | 2.22 | 124 | 0 |
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| 1952 | 60.4 | 97 | 70.5 | 94 | 50.3 | 95 | 4.15 | 70 | 0 |
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| 1951 | 63.2 | 53 | 73.5 | 50 | 52.8 | 53 | 5.56 | 40 | 0 |
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| 1950 | 61 | 82 | 71.3 | 78 | 50.8 | 85 | 5.60 | 37 | 0 |
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| 1949 | 64.6 | 35 | 75 | 37 | 54.3 | 34 | 1.23 | 146 | 0 |
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| 1948 | 60.8 | 89 | 71.8 | 73 | 49.8 | 105 | 1.98 | 130 | 0 |
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| 1947 | 55.5 | 145 | 66.6 | 139 | 44.5 | 147 | 5.28 | 46 | 0 |
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| 1946 | 57.1 | 133 | 67 | 133 | 47.2 | 131 | 2.84 | 108 | 0 |
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| 1945 | 55.6 | 144 | 64.8 | 144 | 46.5 | 139 | 6.32 | 25 | 0 |
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| 1944 | 65.1 | 28 | 74.5 | 43 | 55.6 | 16 | 6.76 | 20 | 0 |
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| 1943 | 57.9 | 126 | 66.7 | 137 | 49.2 | 114 | 4.17 | 69 | 0 |
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| 1942 | 59.9 | 106 | 69.2 | 116 | 50.6 | 91 | 6.60 | 23 | 0 |
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| 1941 | 66.8 | 12 | 78.2 | 13 | 55.4 | 18 | 2.32 | 121 | 0 |
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| 1940 | 58.3 | 125 | 70 | 107 | 46.6 | 136 | 2.09 | 129 | 0 |
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| 1939 | 68.4 | 6 | 80.8 | 3 | 56 | 14 | 1.79 | 133 | 0 |
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| 1938 | 61.1 | 79 | 70.4 | 96 | 51.7 | 71 | 5.21 | 47 | 0 |
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| 1937 | 63.3 | 52 | 73.2 | 53 | 53.5 | 40 | 7.13 | 18 | 0 |
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| 1936 | 68.2 | 8 | 78.7 | 9 | 57.7 | 6 | 1.45 | 140 | 0 |
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| 1935 | 55.9 | 141 | 64.2 | 146 | 47.7 | 125 | 7.18 | 17 | 0 |
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| 1934 | 71.1 | 1 | 84.5 | 1 | 57.7 | 6 | 1.06 | 147 | 0 |
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| 1933 | 61.8 | 70 | 70.9 | 86 | 52.7 | 56 | 2.65 | 114 | 0 |
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| 1932 | 63.8 | 44 | 75.5 | 30 | 52.1 | 66 | 2.68 | 112 | 0 |
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| 1931 | 59.1 | 117 | 70.7 | 91 | 47.6 | 129 | 2.68 | 112 | 0 |
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| 1930 | 61.1 | 79 | 70.8 | 89 | 51.4 | 80 | 3.36 | 93 | 0 |
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| 1929 | 59.2 | 115 | 68.9 | 121 | 49.5 | 109 | 2.18 | 127 | 0 |
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| 1928 | 64.1 | 40 | 75.5 | 30 | 52.8 | 53 | 2.63 | 115 | 0 |
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| 1927 | 60.1 | 104 | 69.6 | 112 | 50.7 | 88 | 3.99 | 73 | 0 |
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| 1926 | 65.4 | 27 | 77.6 | 15 | 53.2 | 47 | 2.11 | 128 | 0 |
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| 1925 | 59.5 | 112 | 71.3 | 78 | 47.6 | 129 | 0.77 | 148 | 0 |
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| 1924 | 55.7 | 143 | 65.8 | 140 | 45.6 | 145 | 1.26 | 145 | 0 |
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| 1923 | 60.7 | 92 | 70.3 | 100 | 51.1 | 83 | 4.78 | 56 | 0 |
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| 1922 | 64.3 | 37 | 73.6 | 49 | 55 | 21 | 6.87 | 19 | 0 |
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| 1921 | 65.5 | 26 | 75.3 | 33 | 55.6 | 16 | 3.62 | 86 | 0 |
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| 1920 | 61.1 | 79 | 70.4 | 96 | 51.9 | 69 | 3.14 | 100 | 0 |
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| 1919 | 59.9 | 106 | 68.9 | 121 | 50.8 | 85 | 2.96 | 104 | 0 |
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| 1918 | 67.2 | 11 | 78.7 | 9 | 55.7 | 15 | 5.87 | 32 | 0 |
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| 1917 | 57.3 | 131 | 68 | 127 | 46.6 | 136 | 3.94 | 76 | 0 |
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| 1916 | 61.7 | 71 | 71.3 | 78 | 52.1 | 66 | 3.87 | 80 | 0 |
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| 1915 | 57.3 | 131 | 66.9 | 135 | 47.7 | 125 | 8.21 | 8 | 0 |
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| 1914 | 64 | 42 | 75 | 37 | 53 | 48 | 4.83 | 53 | 0 |
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| 1913 | 61.3 | 76 | 70.3 | 100 | 52.3 | 63 | 5.06 | 49 | 0 |
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| 1912 | 65 | 30 | 75 | 37 | 54.9 | 23 | 5.62 | 36 | 0 |
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| 1911 | 65.9 | 20 | 76.6 | 21 | 55.2 | 20 | 2.44 | 120 | 0 |
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| 1910 | 56.7 | 137 | 66.9 | 135 | 46.5 | 139 | 3.26 | 96 | 0 |
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| 1909 | 59.2 | 115 | 69.2 | 116 | 49.1 | 115 | 4.24 | 66 | 0 |
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| 1908 | 60.5 | 95 | 70.1 | 104 | 50.8 | 85 | 9.89 | 3 | 0 |
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| 1907 | 54.2 | 148 | 64.2 | 146 | 44.2 | 148 | 3.97 | 74 | 0 |
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| 1906 | 61.9 | 68 | 72.5 | 70 | 51.3 | 82 | 2.21 | 126 | 0 |
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| 1905 | 59.1 | 117 | 69.4 | 114 | 48.8 | 116 | 4.44 | 61 | 0 |
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| 1904 | 60.5 | 95 | 70.8 | 89 | 50.3 | 95 | 3.16 | 98 | 0 |
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| 1903 | 62.8 | 58 | 71.6 | 75 | 53.9 | 35 | 10.64 | 2 | 0 |
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| 1902 | 64.7 | 32 | 74.5 | 43 | 54.9 | 23 | 4.69 | 60 | 0 |
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| 1901 | 61.7 | 71 | 72.6 | 64 | 50.7 | 88 | 1.40 | 144 | 0 |
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| 1900 | 64.2 | 39 | 74 | 46 | 54.4 | 33 | 4.76 | 57 | 0 |
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| 1899 | 60.9 | 85 | 70.4 | 96 | 51.5 | 77 | 6.71 | 21 | 0 |
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| 1898 | 60.7 | 92 | 69.9 | 108 | 51.5 | 77 | 4.22 | 67 | 0 |
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| 1897 | 59.7 | 110 | 70.9 | 86 | 48.5 | 119 | 2.31 | 122 | 0 |
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| 1896 | 66.5 | 15 | 76.1 | 27 | 56.9 | 9 | 6.50 | 24 | 0 |
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| 1895 | 62.7 | 62 | 73.1 | 58 | 52.3 | 63 | 2.86 | 107 | 0 |
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| 1894 | 62.1 | 66 | 73.2 | 53 | 50.9 | 84 | 1.41 | 142 | 0 |
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| 1893 | 56.9 | 136 | 67 | 133 | 46.9 | 134 | 2.84 | 108 | 0 |
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| 1892 | 55 | 147 | 62.3 | 148 | 47.8 | 123 | 8.77 | 6 | 0 |
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| 1891 | 57.8 | 127 | 68.7 | 124 | 46.9 | 134 | 3.29 | 95 | 0 |
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| 1890 | 58.4 | 123 | 69.7 | 109 | 47.1 | 132 | 3.00 | 102 | 0 |
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| 1889 | 60.9 | 85 | 71.3 | 78 | 50.5 | 92 | 4.84 | 52 | 0 |
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| 1888 | 55.3 | 146 | 64.5 | 145 | 46 | 143 | 7.84 | 10 | 0 |
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| 1887 | 66 | 19 | 78.4 | 12 | 53.5 | 40 | 1.91 | 132 | 0 |
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| 1886 | 65.9 | 20 | 77.2 | 17 | 54.6 | 29 | 4.01 | 72 | 0 |
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| 1885 | 60.3 | 100 | 71.9 | 72 | 48.7 | 117 | 1.70 | 136 | 0 |
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| 1884 | 60.8 | 89 | 71.4 | 77 | 50.3 | 95 | 4.34 | 64 | 0 |
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| 1883 | 56.6 | 139 | 65.3 | 142 | 48 | 121 | 9.76 | 4 | 0 |
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| 1882 | 56.3 | 140 | 65.5 | 141 | 47 | 133 | 8.53 | 7 | 0 |
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| 1881 | 68.4 | 6 | 78.2 | 13 | 58.5 | 4 | 3.82 | 83 | 0 |
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| 1880 | 68.1 | 9 | 79.8 | 6 | 56.4 | 11 | 5.84 | 33 | 0 |
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| 1879 | 64.5 | 36 | 75.1 | 35 | 53.9 | 35 | 4.74 | 59 | 0 |
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