Every September in Yakima, WA from 1946 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 | 59.8 | 56 | 73.9 | 70 | 45.7 | 29 | 1.83 | 2 | 1 |
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| 2025 | 67.5 | 1 | 83.7 | 3 | 51.3 | 1 | 0.14 | 47 | 0 |
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| 2024 | 66.7 | 2 | 83.6 | 4 | 49.7 | 4 | 0.06 | 61 | 0 |
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| 2023 | 62.6 | 28 | 77.7 | 47 | 47.4 | 11 | 0.39 | 27 | 0 |
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| 2022 | 65.3 | 7 | 82.3 | 11 | 48.3 | 7 | 0.13 | 49 | 0 |
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| 2021 | 61.7 | 39 | 78 | 44 | 45.3 | 30 | 0.43 | 25 | 0 |
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| 2020 | 64.7 | 12 | 82 | 14 | 47.3 | 12 | 0.06 | 61 | 0 |
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| 2019 | 61.1 | 44 | 74.9 | 65 | 47.3 | 12 | 0.52 | 19 | 0 |
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| 2018 | 59.7 | 57 | 76.4 | 55 | 43.1 | 56 | 0.01 | 74 | 0 |
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| 2017 | 65.2 | 9 | 81.3 | 17 | 49 | 5 | 0.16 | 44 | 0 |
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| 2016 | 62.6 | 28 | 79.2 | 37 | 46 | 27 | 0.17 | 43 | 0 |
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| 2015 | 61.8 | 35 | 78.9 | 39 | 44.7 | 38 | 0.01 | 74 | 0 |
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| 2014 | 63.6 | 21 | 80.4 | 27 | 46.8 | 17 | 0.46 | 23 | 0 |
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| 2013 | 65.1 | 10 | 80.1 | 28 | 50.2 | 3 | 0.30 | 34 | 0 |
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| 2012 | 64 | 15 | 82.7 | 7 | 45.3 | 30 | 0.04 | 67 | 0 |
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| 2011 | 64.9 | 11 | 84.5 | 1 | 45.2 | 33 | 0.07 | 59 | 0 |
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| 2010 | 62.1 | 33 | 76.9 | 54 | 47.3 | 12 | 0.88 | 6 | 0 |
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| 2009 | 62.3 | 32 | 79.9 | 31 | 44.6 | 40 | 0.43 | 25 | 0 |
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| 2008 | 61 | 46 | 79.1 | 38 | 42.9 | 60 | 0.19 | 38 | 0 |
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| 2007 | 60.1 | 54 | 77.3 | 51 | 43 | 57 | 0.19 | 38 | 0 |
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| 2006 | 61.6 | 40 | 80 | 29 | 43.2 | 53 | 0.55 | 17 | 0 |
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| 2005 | 58.8 | 67 | 76.2 | 56 | 41.4 | 73 | 0.37 | 28 | 0 |
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| 2004 | 59.7 | 57 | 75.8 | 58 | 43.7 | 46 | 0.15 | 46 | 0 |
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| 2003 | 63.7 | 20 | 81.3 | 17 | 46.2 | 25 | 0.05 | 65 | 0 |
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| 2002 | 59.9 | 55 | 77.2 | 52 | 42.5 | 64 | 0.10 | 53 | 0 |
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| 2001 | 63.8 | 17 | 81.1 | 20 | 46.4 | 24 | 0.14 | 47 | 0 |
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| 2000 | 59.6 | 59 | 76.1 | 57 | 43.2 | 53 | 0.18 | 41 | 0 |
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| 1999 | 59.3 | 63 | 78 | 44 | 40.6 | 75 | trace | 76 | 0 |
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| 1998 | 65.3 | 7 | 83.2 | 5 | 47.3 | 12 | 0.06 | 61 | 0 |
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| 1997 | 62.4 | 31 | 77.9 | 46 | 46.9 | 16 | 0.24 | 37 | 0 |
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| 1996 | 57.6 | 74 | 74.5 | 66 | 40.6 | 75 | 0.36 | 29 | 0 |
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| 1995 | 63.6 | 21 | 80.6 | 25 | 46.6 | 22 | 0.74 | 12 | 0 |
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| 1994 | 64.4 | 13 | 82.1 | 12 | 46.7 | 20 | 0.09 | 54 | 0 |
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| 1993 | 60.8 | 50 | 79.6 | 33 | 42.1 | 68 | 0.03 | 70 | 0 |
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| 1992 | 59.1 | 65 | 75.1 | 63 | 43 | 57 | 0.28 | 36 | 0 |
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| 1991 | 63.8 | 17 | 82.4 | 10 | 45.1 | 36 | 0.08 | 57 | 0 |
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| 1990 | 65.4 | 6 | 84.1 | 2 | 46.7 | 20 | 0.04 | 67 | 0 |
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| 1989 | 61 | 46 | 79.5 | 35 | 42.5 | 64 | 0.09 | 54 | 0 |
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| 1988 | 59.5 | 60 | 77.6 | 48 | 41.4 | 73 | 0.13 | 49 | 0 |
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| 1987 | 62.9 | 26 | 82 | 14 | 43.7 | 46 | 0.00 | 80 | 0 |
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| 1986 | 56.9 | 77 | 70.8 | 79 | 43 | 57 | 2.07 | 1 | 0 |
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| 1985 | 55.3 | 80 | 70.5 | 80 | 40.1 | 78 | 0.84 | 9 | 0 |
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| 1984 | 59 | 66 | 74.3 | 68 | 43.7 | 46 | 0.46 | 23 | 0 |
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| 1983 | 58.1 | 71 | 73.5 | 73 | 42.7 | 63 | 0.33 | 31 | 0 |
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| 1982 | 60.2 | 53 | 75.1 | 63 | 45.3 | 30 | 1.08 | 3 | 0 |
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| 1981 | 61.5 | 42 | 78.4 | 41 | 44.7 | 38 | 0.59 | 16 | 0 |
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| 1980 | 62.6 | 28 | 78.4 | 41 | 46.8 | 17 | 0.48 | 21 | 0 |
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| 1979 | 64 | 15 | 80.5 | 26 | 47.5 | 10 | 0.36 | 29 | 0 |
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| 1978 | 58.8 | 67 | 72.3 | 77 | 45.2 | 33 | 0.64 | 14 | 0 |
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| 1977 | 57.7 | 73 | 71.3 | 78 | 44.1 | 43 | 0.89 | 5 | 0 |
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| 1976 | 64.3 | 14 | 80.8 | 24 | 47.9 | 9 | 0.13 | 49 | 0 |
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| 1975 | 62.1 | 33 | 81.2 | 19 | 42.9 | 60 | trace | 76 | 0 |
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| 1974 | 63 | 24 | 82.1 | 12 | 43.8 | 45 | 0.02 | 73 | 0 |
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| 1973 | 61.8 | 35 | 77.6 | 48 | 46.1 | 26 | 0.81 | 11 | 0 |
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| 1972 | 56.8 | 78 | 73.9 | 70 | 39.6 | 79 | 0.06 | 61 | 0 |
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| 1971 | 55.4 | 79 | 73.1 | 75 | 37.8 | 80 | 0.73 | 13 | 0 |
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| 1970 | 57.5 | 75 | 73.2 | 74 | 41.8 | 70 | 0.07 | 59 | 0 |
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| 1969 | 61.1 | 44 | 75.5 | 59 | 46.8 | 17 | 0.32 | 32 | 0 |
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| 1968 | 61 | 46 | 75.5 | 59 | 46.5 | 23 | 0.32 | 32 | 0 |
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| 1967 | 65.6 | 4 | 82.7 | 7 | 48.6 | 6 | 0.09 | 54 | 0 |
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| 1966 | 66.5 | 3 | 81.6 | 16 | 51.3 | 1 | 0.87 | 7 | 0 |
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| 1965 | 57.9 | 72 | 74.1 | 69 | 41.6 | 71 | 0.04 | 67 | 0 |
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| 1964 | 57.1 | 76 | 73.6 | 72 | 40.6 | 75 | 0.03 | 70 | 0 |
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| 1963 | 65.5 | 5 | 82.7 | 7 | 48.3 | 7 | 0.08 | 57 | 0 |
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| 1962 | 61.8 | 35 | 80 | 29 | 43.5 | 51 | 0.30 | 34 | 0 |
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| 1961 | 58.2 | 70 | 74.5 | 66 | 41.9 | 69 | trace | 76 | 0 |
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| 1960 | 60.6 | 51 | 78.9 | 39 | 42.3 | 67 | 0.11 | 52 | 0 |
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| 1959 | 58.3 | 69 | 72.4 | 76 | 44.2 | 42 | 0.52 | 19 | 0 |
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| 1958 | 59.2 | 64 | 75.5 | 59 | 42.8 | 62 | 0.05 | 65 | 0 |
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| 1957 | 63.1 | 23 | 81 | 23 | 45.2 | 33 | 0.98 | 4 | 0 |
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| 1956 | 61 | 46 | 78.1 | 43 | 44 | 44 | 0.54 | 18 | 0 |
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| 1955 | 60.3 | 52 | 77 | 53 | 43.6 | 50 | 0.48 | 21 | 0 |
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| 1954 | 59.5 | 60 | 75.4 | 62 | 43.5 | 51 | 0.83 | 10 | 0 |
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| 1953 | 61.5 | 42 | 79.9 | 31 | 43.2 | 53 | trace | 76 | 0 |
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| 1952 | 63.8 | 17 | 83.1 | 6 | 44.4 | 41 | 0.03 | 70 | 0 |
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| 1951 | 61.6 | 40 | 79.5 | 35 | 43.7 | 46 | 0.19 | 38 | 0 |
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| 1950 | 61.8 | 35 | 81.1 | 20 | 42.5 | 64 | 0.18 | 41 | 0 |
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| 1949 | 63 | 24 | 81.1 | 20 | 44.9 | 37 | 0.16 | 44 | 0 |
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| 1948 | 59.5 | 60 | 77.4 | 50 | 41.6 | 71 | 0.64 | 14 | 0 |
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| 1947 | 62.7 | 27 | 79.6 | 33 | 45.8 | 28 | 0.86 | 8 | 0 |
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| 1946 | | | | | | | | | 5 |
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