Every May in Omak, WA from 1909 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 | 62.6 | 9 | 77.7 | 14 | 47.5 | 10 | 0.61 | 59 | 0 |
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| 2025 | 57.8 | 62 | 73.4 | 54 | 42.3 | 69 | 0.45 | 72 | 0 |
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| 2024 | 57.5 | 65 | 73.1 | 60 | 41.8 | 75 | 0.55 | 62 | 0 |
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| 2023 | 66.4 | 1 | 80.5 | 3 | 52.3 | 1 | 0.53 | 63 | 0 |
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| 2022 | 55 | 96 | 67.6 | 99 | 42.4 | 68 | 1.14 | 35 | 0 |
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| 2021 | 59.4 | 39 | 74.9 | 40 | 43.9 | 47 | 0.01 | 110 | 0 |
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| 2020 | 59.7 | 32 | 73.3 | 57 | 46 | 21 | 1.75 | 18 | 0 |
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| 2019 | 61.8 | 15 | 75.9 | 30 | 47.7 | 8 | 2.26 | 9 | 0 |
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| 2018 | 64.3 | 3 | 78 | 10 | 50.4 | 2 | 0.52 | 66 | 3 |
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| 2017 | 59.1 | 43 | 72.8 | 63 | 45.4 | 27 | 1.53 | 25 | 0 |
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| 2016 | 61.6 | 17 | 75.3 | 33 | 48 | 6 | 0.69 | 55 | 0 |
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| 2015 | 62 | 13 | 77.4 | 17 | 46.7 | 15 | 1.42 | 27 | 0 |
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| 2014 | 59.5 | 36 | 74.8 | 42 | 44.2 | 41 | 0.48 | 71 | 0 |
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| 2013 | 58.9 | 44 | 73.5 | 52 | 44.4 | 37 | 1.57 | 23 | 0 |
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| 2012 | 55.8 | 87 | 70.4 | 86 | 41.2 | 86 | 0.53 | 63 | 0 |
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| 2011 | 54.7 | 100 | 67.5 | 102 | 41.9 | 74 | 2.97 | 6 | 0 |
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| 2010 | 52.8 | 108 | 66.8 | 105 | 38.8 | 109 | 3.05 | 5 | 0 |
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| 2009 | 57.3 | 70 | 73.4 | 54 | 41.3 | 85 | 1.23 | 32 | 0 |
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| 2008 | 58.7 | 49 | 73.4 | 54 | 43.9 | 47 | 0.18 | 97 | 1 |
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| 2007 | 57.4 | 67 | 74 | 49 | 40.8 | 94 | 0.74 | 52 | 0 |
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| 2006 | 57.3 | 70 | 72.9 | 61 | 41.6 | 77 | 1.35 | 29 | 0 |
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| 2005 | 58.9 | 44 | 73.3 | 57 | 44.4 | 37 | 2.11 | 12 | 0 |
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| 2004 | 56.9 | 77 | 71.5 | 77 | 42.2 | 70 | 1.75 | 18 | 0 |
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| 2003 | 56 | 83 | 69.2 | 94 | 42.7 | 62 | 1.10 | 36 | 0 |
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| 2002 | 54.9 | 98 | 68.8 | 96 | 40.9 | 91 | 0.73 | 53 | 1 |
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| 2001 | 58.2 | 54 | 75 | 37 | 41.5 | 79 | 0.52 | 66 | 0 |
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| 2000 | 55.2 | 94 | 69.2 | 94 | 41.1 | 88 | 0.25 | 93 | 0 |
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| 1999 | 53.2 | 107 | 67.6 | 99 | 38.8 | 109 | 0.72 | 54 | 0 |
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| 1998 | 59.3 | 42 | 71.9 | 71 | 46.6 | 16 | 1.18 | 33 | 0 |
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| 1997 | | | | | | | | | 11 |
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| 1996 | 55.5 | 90 | 67.6 | 99 | 43.4 | 52 | 1.06 | 39 | 2 |
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| 1995 | | | 75.2 | 34 | | | 0.58 | 60 | 4 |
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| 1994 | 59.4 | 39 | 71.9 | 71 | 46.9 | 14 | 1.82 | 16 | 0 |
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| 1993 | 63.5 | 5 | 76.6 | 25 | 50.3 | 3 | 0.39 | 78 | 1 |
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| 1992 | 60.3 | 29 | 74.9 | 40 | 45.7 | 23 | 0.07 | 108 | 1 |
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| 1991 | 59.5 | 36 | 71.1 | 81 | 47.8 | 7 | 1.42 | 27 | 0 |
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| 1990 | 57.7 | 64 | 69.4 | 93 | 46 | 21 | | | 0 |
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| 1989 | 59.4 | 39 | 72.7 | 65 | 46.1 | 19 | 4.22 | 2 | 0 |
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| 1988 | 59.5 | 36 | 72.9 | 61 | 46.2 | 18 | 0.45 | 72 | 0 |
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| 1987 | 62.8 | 8 | 77.2 | 21 | 48.4 | 5 | 0.96 | 45 | 0 |
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| 1986 | 61.1 | 20 | 77 | 24 | 45.5 | 26 | 0.09 | 106 | 3 |
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| 1985 | 62.5 | 11 | 77.4 | 17 | 47.6 | 9 | 0.88 | 49 | 0 |
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| 1984 | 55.7 | 88 | 68.6 | 98 | 42.7 | 62 | 0.89 | 47 | 0 |
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| 1983 | 61.3 | 18 | 78.6 | 9 | 44 | 43 | 0.98 | 43 | 0 |
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| 1982 | 58.7 | 49 | 74.3 | 46 | 43.1 | 57 | 0.28 | 90 | 0 |
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| 1981 | 59.7 | 32 | 71.9 | 71 | 47.5 | 10 | 2.01 | 15 | 0 |
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| 1979 | 58.9 | 44 | 73.5 | 52 | 44.2 | 41 | 0.34 | 84 | 0 |
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| 1978 | 54.2 | 102 | 67.5 | 102 | 40.8 | 94 | 0.51 | 68 | 0 |
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| 1977 | 53.8 | 103 | 65.9 | 110 | 41.7 | 76 | 2.75 | 7 | 0 |
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| 1976 | | | | | | | 0.66 | 56 | 21 |
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| 1975 | 55.9 | 85 | 69.6 | 91 | 42.1 | 72 | 1.33 | 30 | 0 |
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| 1974 | 52.8 | 108 | 65.9 | 110 | 39.6 | 106 | 0.87 | 50 | 0 |
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| 1973 | 57.1 | 73 | 72.5 | 67 | 41.6 | 77 | 0.34 | 84 | 0 |
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| 1972 | 57.9 | 60 | 70.8 | 85 | 45 | 33 | 2.17 | 10 | 0 |
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| 1971 | 58.8 | 48 | 71.5 | 77 | 46.1 | 19 | 1.10 | 36 | 0 |
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| 1970 | 56.8 | 78 | 72 | 70 | 41.5 | 79 | 0.16 | 99 | 0 |
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| 1969 | 60.1 | 30 | 75.2 | 34 | 45.1 | 32 | 0.57 | 61 | 0 |
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| 1968 | 56.4 | 80 | 71.3 | 80 | 41.5 | 79 | 0.99 | 42 | 0 |
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| 1967 | 55.3 | 91 | 70.4 | 86 | 40.3 | 100 | 0.91 | 46 | 0 |
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| 1966 | 57.5 | 65 | 74.1 | 48 | 40.8 | 94 | 0.36 | 79 | 0 |
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| 1965 | 55.7 | 88 | 70 | 88 | 41.4 | 82 | 1.07 | 38 | 0 |
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| 1964 | 55.3 | 91 | 71 | 82 | 39.6 | 106 | 0.03 | 109 | 0 |
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| 1963 | 57.8 | 62 | 72.6 | 66 | 43 | 60 | 0.43 | 75 | 0 |
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| 1962 | 55 | 96 | 67 | 104 | 42.9 | 61 | 1.61 | 21 | 0 |
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| 1961 | 56.6 | 79 | 70 | 88 | 43.3 | 54 | 1.52 | 26 | 0 |
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| 1960 | 53.6 | 105 | 66.4 | 108 | 40.7 | 97 | 2.03 | 14 | 1 |
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| 1959 | 53.5 | 106 | 66.7 | 106 | 40.3 | 100 | 1.00 | 41 | 0 |
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| 1958 | 64 | 4 | 80.5 | 3 | 47.4 | 13 | 0.28 | 90 | 0 |
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| 1957 | 61.8 | 15 | 75 | 37 | 48.7 | 4 | 3.14 | 4 | 0 |
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| 1956 | 60.6 | 25 | 75.9 | 30 | 45.3 | 29 | 0.14 | 103 | 0 |
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| 1955 | 53.8 | 103 | 66.6 | 107 | 40.9 | 91 | 0.16 | 99 | 0 |
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| 1954 | 58 | 58 | 72.5 | 67 | 43.5 | 51 | 1.04 | 40 | 0 |
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| 1953 | 55.2 | 94 | 69.5 | 92 | 40.9 | 91 | 1.78 | 17 | 0 |
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| 1952 | 58.2 | 54 | 72.4 | 69 | 44 | 43 | 0.66 | 56 | 0 |
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| 1951 | 57 | 76 | 70.9 | 84 | 43.1 | 57 | 0.43 | 75 | 0 |
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| 1950 | 54.9 | 98 | 69.7 | 90 | 40.1 | 102 | 0.62 | 58 | 0 |
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| 1949 | 61 | 21 | 77.8 | 12 | 44.3 | 40 | 0.17 | 98 | 0 |
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| 1948 | 55.3 | 91 | 66.1 | 109 | 44.5 | 35 | 4.42 | 1 | 0 |
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| 1947 | 62 | 13 | 77.7 | 14 | 46.3 | 17 | 0.16 | 99 | 0 |
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| 1946 | 60.7 | 23 | 77.1 | 23 | 44.4 | 37 | 0.42 | 77 | 0 |
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| 1945 | | | | | 45.6 | 25 | 0.53 | 63 | 5 |
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| 1944 | 60.5 | 26 | 77.8 | 12 | 43.3 | 54 | 0.36 | 79 | 0 |
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| 1943 | 55.9 | 85 | 71.6 | 75 | 40.1 | 102 | 0.50 | 69 | 0 |
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| 1942 | 58.1 | 56 | 71.7 | 74 | 44.5 | 35 | 3.85 | 3 | 0 |
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| 1941 | 59.7 | 32 | 74.3 | 46 | 45.2 | 30 | 2.10 | 13 | 0 |
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| 1940 | | | 77.4 | 17 | | | 0.49 | 70 | 12 |
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| 1939 | 61.3 | 18 | 77.4 | 17 | 45.2 | 30 | 0.19 | 96 | 0 |
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| 1938 | 59.6 | 35 | 76.4 | 26 | 42.5 | 65 | trace | 111 | 1 |
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| 1937 | 58.5 | 52 | 74.4 | 44 | 42.6 | 64 | 0.36 | 79 | 0 |
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| 1936 | 63.2 | 7 | 78.8 | 8 | 47.5 | 10 | 0.34 | 84 | 0 |
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| 1935 | 58 | 58 | 76 | 29 | 39.9 | 105 | 0.10 | 105 | 0 |
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| 1934 | 62.2 | 12 | 79.5 | 6 | 44.9 | 34 | 0.34 | 84 | 0 |
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| 1933 | 54.6 | 101 | 68.7 | 97 | 40.5 | 99 | 0.83 | 51 | 0 |
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| 1932 | 58.9 | 44 | 74.6 | 43 | 43.1 | 57 | 0.89 | 47 | 0 |
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| 1931 | 62.6 | 9 | 79.9 | 5 | 45.4 | 27 | 0.32 | 88 | 0 |
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| 1930 | 58.1 | 56 | 73.8 | 51 | 42.5 | 65 | 0.35 | 82 | 0 |
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| 1929 | 58.5 | 52 | 75.9 | 30 | 41.2 | 86 | | | 2 |
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| 1928 | 63.4 | 6 | 84.2 | 2 | 42.5 | 65 | | | 0 |
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| 1927 | 56.2 | 81 | 71.6 | 75 | 41.1 | 88 | 0.98 | 43 | 1 |
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| 1926 | 60.4 | 27 | 77.2 | 21 | 43.7 | 50 | 0.45 | 72 | 2 |
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| 1925 | | | | | 45.7 | 23 | 0.25 | 93 | 5 |
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| 1924 | 64.4 | 2 | 85.4 | 1 | 44 | 43 | 0.12 | 104 | 2 |
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| 1923 | 58.7 | 49 | 76.3 | 28 | 42 | 73 | 1.18 | 33 | 3 |
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| 1922 | 57.1 | 73 | 75 | 37 | 39.2 | 108 | 0.15 | 102 | 0 |
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| 1921 | 60.8 | 22 | 78 | 10 | 43.9 | 47 | 0.32 | 88 | 2 |
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| 1920 | 56 | 83 | 73.2 | 59 | 38.8 | 109 | trace | 111 | 0 |
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| 1919 | 57.9 | 60 | 75.2 | 34 | 40.6 | 98 | 0.22 | 95 | 0 |
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| 1918 | 57.3 | 70 | 74.4 | 44 | 40.1 | 102 | 0.09 | 106 | 0 |
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| 1917 | 57.1 | 73 | 72.8 | 63 | 41.4 | 82 | 1.26 | 31 | 0 |
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| 1916 | 56.2 | 81 | 71 | 82 | 41.4 | 82 | 1.69 | 20 | 0 |
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| 1915 | 57.4 | 67 | 71.4 | 79 | 43.4 | 52 | 2.41 | 8 | 0 |
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| 1914 | 60.4 | 27 | 77.6 | 16 | 43.2 | 56 | 0.26 | 92 | 0 |
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| 1913 | 57.4 | 67 | 74 | 49 | 41 | 90 | 2.12 | 11 | 1 |
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| 1912 | 60 | 31 | 76.4 | 26 | 44 | 43 | 1.60 | 22 | 1 |
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| 1910 | 60.7 | 23 | 79.3 | 7 | 42.2 | 70 | 0.35 | 82 | 0 |
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| 1909 | | | | | | | 1.56 | 24 | 31 |
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