Every April in Riverside, CA 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 | 65.2 | 15 | 78 | 38 | 52.4 | 8 | 0.61 | 46 | 0 |
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| 2025 | 62.6 | 41 | 74.6 | 78 | 50.6 | 23 | 0.09 | 87 | 0 |
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| 2024 | 61.3 | 60 | 74.2 | 80 | 48.3 | 38 | 0.14 | 80 | 0 |
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| 2023 | 62.4 | 43 | 76 | 61 | 48.8 | 30 | 0.04 | 92 | 0 |
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| 2022 | 65.9 | 8 | 79.2 | 20 | 52.5 | 7 | 0.20 | 76 | 0 |
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| 2021 | 64.6 | 20 | 78.2 | 33 | 51.1 | 17 | trace | 100 | 0 |
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| 2020 | 63.5 | 30 | 74.1 | 84 | 52.9 | 5 | 2.65 | 4 | 0 |
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| 2019 | 64.9 | 16 | 77.6 | 44 | 52.1 | 10 | 0.02 | 95 | 0 |
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| 2018 | 65.5 | 11 | 79.2 | 20 | 51.9 | 15 | trace | 100 | 0 |
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| 2017 | 66.4 | 5 | 80.6 | 11 | 52.1 | 10 | 0.10 | 84 | 0 |
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| 2016 | 66.4 | 5 | 79.5 | 15 | 53.3 | 3 | 0.49 | 54 | 0 |
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| 2015 | 65.6 | 10 | 78.8 | 27 | 52.4 | 8 | 0.37 | 60 | 0 |
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| 2014 | 65.9 | 8 | 79.7 | 13 | 52 | 12 | 0.36 | 62 | 0 |
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| 2013 | 64.9 | 16 | 77.8 | 41 | 52 | 12 | trace | 100 | 0 |
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| 2012 | 64.6 | 20 | 78.1 | 34 | 51 | 18 | 0.87 | 32 | 0 |
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| 2011 | 63.7 | 26 | 75.8 | 63 | 51.5 | 16 | 0.04 | 92 | 0 |
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| 2010 | 60 | 76 | 72.1 | 99 | 47.9 | 44 | 0.97 | 31 | 0 |
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| 2009 | 62.2 | 45 | 75.6 | 64 | 48.7 | 32 | 0.01 | 98 | 0 |
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| 2008 | | | | | | | trace | 100 | 10 |
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| 2007 | | | | | | | 0.30 | 68 | 7 |
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| 2006 | | | | | | | | | 5 |
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| 2005 | | | 76.1 | 60 | 48.1 | 43 | 0.78 | 36 | 4 |
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| 2004 | | | | | | | 0.57 | 49 | 7 |
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| 2003 | | | 71.6 | 108 | 47.4 | 55 | 1.65 | 13 | 5 |
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| 2002 | | | | | | | 0.23 | 73 | 7 |
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| 2001 | | | | | | | 0.43 | 58 | 6 |
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| 2000 | 66 | 7 | 80.9 | 8 | 50.9 | 19 | 0.65 | 43 | 3 |
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| 1999 | 59.5 | 86 | 71.9 | 102 | 47.1 | 61 | 1.72 | 12 | 3 |
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| 1998 | | | 75.4 | 68 | | | 0.82 | 35 | 4 |
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| 1997 | | | 79.5 | 15 | | | 0.12 | 83 | 4 |
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| 1996 | 67 | 4 | 83.4 | 2 | 50.7 | 22 | 0.14 | 80 | 0 |
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| 1995 | 61.6 | 57 | 74.9 | 73 | 48.4 | 36 | 1.03 | 28 | 2 |
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| 1994 | 63 | 36 | 75.3 | 69 | 50.8 | 20 | 0.67 | 41 | 2 |
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| 1993 | | | | | | | 0.00 | 107 | 6 |
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| 1992 | 68.1 | 3 | 81.9 | 4 | 54.3 | 1 | trace | 100 | 0 |
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| 1991 | 63.1 | 34 | 77.2 | 49 | 49.1 | 27 | 0.10 | 84 | 1 |
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| 1990 | 65.4 | 13 | 77.5 | 45 | 53.3 | 3 | 0.46 | 56 | 0 |
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| 1989 | 68.4 | 1 | 83.3 | 3 | 53.6 | 2 | 0.01 | 98 | 1 |
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| 1988 | 64.9 | 16 | 79 | 25 | 50.8 | 20 | 2.19 | 8 | 1 |
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| 1987 | 68.3 | 2 | 84.7 | 1 | 52 | 12 | 0.14 | 80 | 0 |
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| 1986 | 62.7 | 39 | 77.7 | 43 | 47.7 | 48 | 0.86 | 33 | 0 |
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| 1985 | 65.3 | 14 | 81.6 | 5 | 48.9 | 29 | trace | 100 | 0 |
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| 1984 | 63.1 | 34 | 78.9 | 26 | 47.4 | 55 | 0.20 | 76 | 2 |
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| 1983 | 59.1 | 94 | 71.6 | 108 | 46.6 | 68 | 2.44 | 7 | 0 |
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| 1982 | 61.2 | 62 | 74.5 | 79 | 47.8 | 47 | 1.27 | 23 | 0 |
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| 1981 | 63.9 | 25 | 78.1 | 34 | 49.6 | 26 | 0.35 | 64 | 0 |
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| 1980 | 63.3 | 32 | 78.1 | 34 | 48.6 | 33 | 0.07 | 88 | 2 |
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| 1979 | 62.7 | 39 | 77 | 51 | 48.5 | 34 | 0.00 | 107 | 0 |
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| 1978 | 59.8 | 82 | 71.9 | 102 | 47.6 | 50 | 1.64 | 14 | 0 |
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| 1977 | 63.7 | 26 | 79.1 | 23 | 48.3 | 38 | 0.02 | 95 | 0 |
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| 1976 | 58.8 | 96 | 72.9 | 94 | 45.2 | 87 | 0.85 | 34 | 1 |
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| 1975 | 56.3 | 113 | 68.2 | 120 | 44.4 | 95 | 1.14 | 25 | 0 |
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| 1974 | 62 | 51 | 78.7 | 28 | 45.2 | 87 | 0.36 | 62 | 0 |
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| 1973 | 60 | 76 | 74 | 86 | 45.9 | 83 | 0.00 | 107 | 0 |
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| 1972 | 61.9 | 53 | 77.8 | 41 | 46.1 | 74 | 0.00 | 107 | 0 |
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| 1971 | 59.4 | 89 | 73.8 | 89 | 45 | 90 | 0.24 | 72 | 0 |
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| 1970 | 58.4 | 102 | 74.2 | 80 | 42.5 | 108 | 0.05 | 90 | 0 |
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| 1969 | 61.8 | 54 | 74.9 | 73 | 48.5 | 34 | 0.34 | 65 | 1 |
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| 1968 | 62 | 51 | 77.5 | 45 | 46.6 | 68 | 1.02 | 30 | 1 |
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| 1967 | 53.4 | 116 | 65.2 | 121 | 41.5 | 115 | 2.63 | 5 | 1 |
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| 1966 | 64.4 | 22 | 79.9 | 12 | 49.1 | 27 | 0.00 | 107 | 1 |
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| 1965 | 60 | 76 | 72.9 | 94 | 46.5 | 71 | 3.64 | 1 | 1 |
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| 1964 | 59.2 | 93 | 73.5 | 92 | 44.8 | 93 | 0.75 | 38 | 0 |
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| 1963 | 57.2 | 110 | 71.4 | 110 | 43.1 | 103 | 1.44 | 20 | 1 |
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| 1962 | 64.8 | 19 | 81.3 | 6 | 48.2 | 40 | 0.00 | 107 | 1 |
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| 1961 | 62.8 | 37 | 79.5 | 15 | 46.1 | 74 | 0.02 | 95 | 0 |
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| 1960 | 63.6 | 29 | 79.3 | 19 | 47.9 | 44 | 1.05 | 26 | 0 |
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| 1959 | 65.5 | 11 | 80.9 | 8 | 50.1 | 25 | 0.18 | 78 | 1 |
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| 1958 | 61.2 | 62 | 75.5 | 65 | 46.9 | 64 | 2.89 | 2 | 0 |
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| 1957 | 60.4 | 69 | 74 | 86 | 46.8 | 66 | 1.03 | 28 | 1 |
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| 1956 | 60 | 76 | 72.3 | 97 | 47.5 | 54 | 1.61 | 15 | 2 |
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| 1955 | 58.7 | 97 | 76.2 | 57 | 41.4 | 117 | 0.37 | 60 | 1 |
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| 1954 | 59.7 | 84 | 72.5 | 96 | 47 | 62 | 0.05 | 90 | 0 |
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| 1953 | 56.4 | 112 | 69.3 | 117 | 43.4 | 100 | 1.45 | 19 | 0 |
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| 1952 | 58.7 | 97 | 70 | 115 | 47.3 | 57 | 1.61 | 15 | 0 |
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| 1951 | 59.9 | 80 | 72.1 | 99 | 47.7 | 48 | 1.20 | 24 | 0 |
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| 1950 | 60.4 | 69 | 75.9 | 62 | 44.9 | 92 | 0.63 | 45 | 0 |
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| 1949 | 62.1 | 49 | 78.7 | 28 | 45.4 | 86 | trace | 100 | 0 |
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| 1948 | | | 74.8 | 75 | | | 0.75 | 38 | 6 |
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| 1947 | 61.7 | 55 | 78.3 | 30 | 45.2 | 87 | 0.25 | 70 | 3 |
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| 1946 | 62.8 | 37 | 78.3 | 30 | 47.3 | 57 | 0.64 | 44 | 0 |
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| 1945 | 58.4 | 102 | 74.7 | 76 | 42 | 113 | 0.21 | 75 | 0 |
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| 1944 | 58 | 106 | 72.1 | 99 | 43.9 | 97 | 1.38 | 22 | 0 |
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| 1943 | 60.8 | 67 | 75 | 72 | 46.6 | 68 | 1.57 | 17 | 0 |
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| 1942 | 59.5 | 86 | 71.9 | 102 | 47 | 62 | 0.77 | 37 | 0 |
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| 1941 | 57.8 | 107 | 69.5 | 116 | 46.1 | 74 | 2.78 | 3 | 0 |
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| 1940 | 62.3 | 44 | 76.2 | 57 | 48.4 | 36 | 2.06 | 9 | 0 |
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| 1939 | 63.7 | 26 | 79.1 | 23 | 48.2 | 40 | 0.49 | 54 | 0 |
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| 1938 | 60.6 | 68 | 75.5 | 65 | 45.7 | 84 | 0.60 | 47 | 1 |
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| 1937 | 60.1 | 74 | 76.5 | 53 | 43.6 | 98 | 0.34 | 65 | 0 |
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| 1936 | 61.3 | 60 | 76.5 | 53 | 46 | 79 | 0.33 | 67 | 0 |
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| 1935 | 58.7 | 97 | 71.9 | 102 | 45.5 | 85 | 0.70 | 40 | 0 |
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| 1934 | 64.1 | 23 | 81 | 7 | 47.3 | 57 | 0.04 | 92 | 0 |
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| 1933 | 57.5 | 109 | 71.9 | 102 | 43.1 | 103 | 1.05 | 26 | 1 |
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| 1932 | 59 | 95 | 75.5 | 65 | 42.5 | 108 | 0.56 | 51 | 0 |
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| 1931 | 63.4 | 31 | 79.2 | 20 | 47.6 | 50 | 1.43 | 21 | 0 |
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| 1930 | 61.7 | 55 | 77.3 | 48 | 46 | 79 | 0.67 | 41 | 0 |
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| 1929 | 56.2 | 114 | 68.3 | 119 | 44.1 | 96 | 1.46 | 18 | 0 |
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| 1928 | 59.9 | 80 | 77.9 | 40 | 42 | 113 | 0.10 | 84 | 0 |
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| 1927 | 60.4 | 69 | 74.7 | 76 | 46.1 | 74 | 0.52 | 52 | 0 |
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| 1926 | 64 | 24 | 75.2 | 71 | 52.8 | 6 | | | 0 |
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| 1925 | 59.8 | 82 | 73.6 | 90 | 46 | 79 | | | 0 |
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| 1924 | 59.3 | 90 | 71.9 | 102 | 46.7 | 67 | | | 0 |
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| 1923 | 59.5 | 86 | 71.3 | 112 | 47.6 | 50 | | | 0 |
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| 1922 | 56.7 | 111 | 71 | 113 | 42.3 | 110 | | | 0 |
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| 1921 | 58.5 | 100 | 76.3 | 56 | 40.7 | 118 | 0.06 | 89 | 0 |
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| 1920 | 58.5 | 100 | 74.2 | 80 | 42.8 | 106 | | | 0 |
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| 1919 | 62.2 | 45 | 78.1 | 34 | 46.3 | 72 | 0.57 | 49 | 0 |
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| 1918 | 61.5 | 58 | 76.8 | 52 | 46.1 | 74 | | | 0 |
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| 1917 | 60.4 | 69 | 77.2 | 49 | 43.5 | 99 | | | 3 |
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| 1916 | 62.1 | 49 | 80.8 | 10 | 43.3 | 101 | | | 0 |
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| 1915 | 62.2 | 45 | 74.1 | 84 | 50.3 | 24 | | | 0 |
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| 1914 | 62.5 | 42 | 77.4 | 47 | 47.6 | 50 | 1.76 | 11 | 0 |
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| 1913 | 60.2 | 73 | 78 | 38 | 42.3 | 110 | 0.43 | 58 | 0 |
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| 1912 | 56.2 | 114 | 69 | 118 | 43.3 | 101 | 1.79 | 10 | 0 |
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| 1911 | 59.3 | 90 | 72.3 | 97 | 46.2 | 73 | 0.51 | 53 | 0 |
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| 1910 | 63.3 | 32 | 79.7 | 13 | 46.9 | 64 | 0.18 | 78 | 0 |
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| 1909 | 62.2 | 45 | 76.2 | 57 | 48.2 | 40 | | | 0 |
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| 1908 | 61.5 | 58 | 78.3 | 30 | 44.6 | 94 | | | 0 |
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| 1907 | 61 | 65 | 73.3 | 93 | 48.8 | 30 | | | 1 |
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| 1906 | 58.3 | 105 | 73.6 | 90 | 43 | 105 | | | 0 |
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| 1905 | 59.3 | 90 | 71.4 | 110 | 47.2 | 60 | 0.45 | 57 | 0 |
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| 1904 | 59.6 | 85 | 76.5 | 53 | 42.1 | 112 | 0.58 | 48 | 1 |
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| 1903 | 57.8 | 107 | 70.7 | 114 | 45 | 90 | 2.49 | 6 | 1 |
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| 1902 | 58.4 | 102 | 75.3 | 69 | 41.5 | 115 | 0.23 | 73 | 0 |
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| 1895 | 60.1 | 74 | 74.2 | 80 | 46 | 79 | 0.25 | 70 | 0 |
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| 1894 | 61.1 | 64 | 79.5 | 15 | 42.8 | 106 | | | 0 |
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| 1893 | 60.9 | 66 | 73.9 | 88 | 47.9 | 44 | 0.26 | 69 | 0 |
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