Every May in Olympia, WA from 1948 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 | 56.1 | 16 | 69 | 14 | 43.3 | 22 | 1.56 | 45 | 0 |
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| 2025 | 53.7 | 38 | 66.9 | 30 | 40.6 | 53 | 0.96 | 64 | 0 |
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| 2024 | 53.7 | 38 | 65.7 | 40 | 41.7 | 37 | 1.38 | 56 | 0 |
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| 2023 | 58.6 | 2 | 72.3 | 3 | 44.8 | 7 | 0.59 | 72 | 0 |
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| 2022 | 51.1 | 69 | 60.7 | 75 | 41.6 | 41 | 4.33 | 6 | 0 |
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| 2021 | 54.3 | 30 | 66.3 | 38 | 42.3 | 32 | 1.81 | 39 | 0 |
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| 2020 | 56.2 | 15 | 67.3 | 24 | 45.1 | 5 | 2.87 | 21 | 0 |
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| 2019 | 57.5 | 6 | 70.3 | 9 | 44.8 | 7 | 0.90 | 67 | 0 |
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| 2018 | 57.6 | 4 | 70.5 | 6 | 44.6 | 10 | 0.24 | 77 | 0 |
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| 2017 | 55.9 | 18 | 67.6 | 22 | 44.1 | 16 | 3.07 | 18 | 0 |
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| 2016 | 57.2 | 8 | 69.3 | 12 | 45 | 6 | 0.15 | 79 | 0 |
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| 2015 | 56.6 | 11 | 68.4 | 16 | 44.8 | 7 | 0.67 | 71 | 0 |
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| 2014 | 55.9 | 18 | 67.9 | 19 | 43.9 | 17 | 3.34 | 12 | 0 |
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| 2013 | 55.6 | 21 | 66.6 | 34 | 44.5 | 11 | 3.21 | 14 | 0 |
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| 2012 | 52.7 | 54 | 64.9 | 49 | 40.5 | 56 | 2.73 | 22 | 0 |
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| 2011 | 50.3 | 76 | 60.4 | 77 | 40.1 | 61 | 4.16 | 7 | 0 |
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| 2010 | 51 | 72 | 61.5 | 74 | 40.6 | 53 | 4.14 | 8 | 0 |
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| 2009 | 53.8 | 35 | 67 | 29 | 40.6 | 53 | 4.68 | 4 | 0 |
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| 2008 | 54.5 | 27 | 64.8 | 51 | 44.3 | 12 | 0.48 | 74 | 0 |
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| 2007 | 53.6 | 40 | 66.8 | 31 | 40.5 | 56 | 1.22 | 59 | 0 |
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| 2006 | 54.8 | 25 | 67.1 | 25 | 42.4 | 30 | 2.36 | 29 | 0 |
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| 2005 | 56.6 | 11 | 66.7 | 32 | 46.5 | 2 | 4.06 | 9 | 0 |
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| 2004 | 54.8 | 25 | 65.4 | 44 | 44.3 | 12 | 2.00 | 34 | 0 |
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| 2003 | 52.8 | 51 | 64.6 | 54 | 41.1 | 46 | 1.14 | 62 | 0 |
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| 2002 | 51.1 | 69 | 62.1 | 69 | 40 | 64 | 2.04 | 33 | 0 |
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| 2001 | 53.6 | 40 | 67.1 | 25 | 40.1 | 61 | 1.92 | 36 | 0 |
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| 2000 | 53.4 | 45 | 63.2 | 62 | 43.5 | 19 | 3.28 | 13 | 0 |
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| 1999 | 50.4 | 75 | 62 | 70 | 38.9 | 74 | 1.54 | 46 | 0 |
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| 1998 | 53.3 | 46 | 62.4 | 66 | 44.3 | 12 | 2.11 | 30 | 0 |
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| 1997 | | | | | | | 3.10 | 17 | 5 |
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| 1996 | 50.7 | 74 | 60.5 | 76 | 40.8 | 50 | 3.14 | 16 | 0 |
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| 1995 | 57.2 | 8 | 71.3 | 4 | 43 | 24 | 1.16 | 61 | 0 |
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| 1994 | 55.8 | 20 | 69.1 | 13 | 42.6 | 26 | 1.44 | 53 | 0 |
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| 1993 | 58.6 | 2 | 70 | 10 | 47.2 | 1 | 4.57 | 5 | 0 |
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| 1992 | 57.5 | 6 | 72.6 | 2 | 42.4 | 30 | 0.19 | 78 | 0 |
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| 1991 | 51.8 | 62 | 61.6 | 73 | 42.1 | 34 | 1.69 | 43 | 0 |
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| 1990 | 52.5 | 56 | 62.6 | 64 | 42.3 | 32 | 2.06 | 32 | 0 |
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| 1989 | 53.9 | 33 | 65.7 | 40 | 42.1 | 34 | 1.99 | 35 | 0 |
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| 1988 | 53.3 | 46 | 64.1 | 56 | 42.5 | 27 | 3.36 | 11 | 0 |
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| 1987 | 55.5 | 22 | 67.6 | 22 | 43.4 | 21 | 2.71 | 24 | 0 |
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| 1986 | 54.4 | 29 | 65.1 | 46 | 43.7 | 18 | 3.20 | 15 | 0 |
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| 1985 | 54.5 | 27 | 66.5 | 35 | 42.5 | 27 | 0.94 | 65 | 0 |
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| 1984 | 51.6 | 65 | 62.4 | 66 | 40.7 | 52 | 5.48 | 2 | 0 |
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| 1983 | 56.5 | 13 | 68.7 | 15 | 44.2 | 15 | 1.51 | 48 | 0 |
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| 1982 | 54.1 | 31 | 67.9 | 19 | 40.3 | 60 | 0.51 | 73 | 0 |
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| 1981 | 53.9 | 33 | 64.7 | 53 | 43.1 | 23 | 1.81 | 39 | 0 |
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| 1980 | 52.8 | 51 | 65.5 | 43 | 40.1 | 61 | 0.93 | 66 | 0 |
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| 1979 | 54.9 | 23 | 68.2 | 18 | 41.5 | 43 | 1.40 | 55 | 0 |
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| 1978 | 52.9 | 49 | 64.9 | 49 | 40.9 | 48 | 2.90 | 20 | 0 |
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| 1977 | 51.4 | 68 | 61.8 | 72 | 40.9 | 48 | 5.21 | 3 | 0 |
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| 1976 | 51.5 | 67 | 63.9 | 57 | 39.1 | 73 | 2.66 | 25 | 0 |
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| 1975 | 52.5 | 56 | 65.1 | 46 | 39.9 | 66 | 1.51 | 48 | 0 |
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| 1974 | 51.8 | 62 | 62 | 70 | 41.6 | 41 | 2.65 | 27 | 0 |
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| 1973 | 53.8 | 35 | 67.7 | 21 | 40 | 64 | 2.66 | 25 | 0 |
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| 1972 | 54.9 | 23 | 68.4 | 16 | 41.4 | 44 | 0.83 | 69 | 0 |
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| 1971 | 53.6 | 40 | 65.6 | 42 | 41.7 | 37 | 1.50 | 50 | 0 |
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| 1970 | 51.8 | 62 | 65.4 | 44 | 38.2 | 77 | 1.21 | 60 | 0 |
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| 1969 | 56.1 | 16 | 70.5 | 6 | 41.8 | 36 | 2.07 | 31 | 0 |
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| 1968 | 54 | 32 | 65.1 | 46 | 42.8 | 25 | 2.57 | 28 | 0 |
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| 1967 | 53.6 | 40 | 66.7 | 32 | 40.5 | 56 | 0.25 | 76 | 0 |
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| 1966 | 52.6 | 55 | 66.5 | 35 | 38.6 | 75 | 1.30 | 58 | 0 |
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| 1965 | 51.6 | 65 | 63.6 | 60 | 39.5 | 70 | 1.89 | 38 | 0 |
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| 1964 | 49.9 | 77 | 62.8 | 63 | 37 | 78 | 0.98 | 63 | 0 |
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| 1963 | 53.1 | 48 | 67.1 | 25 | 39.2 | 72 | 1.76 | 42 | 0 |
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| 1962 | 49.6 | 78 | 59.7 | 78 | 39.5 | 70 | 1.81 | 39 | 0 |
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| 1961 | 52.5 | 56 | 63.9 | 57 | 41 | 47 | 2.93 | 19 | 0 |
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| 1960 | 52.1 | 61 | 62.5 | 65 | 41.7 | 37 | 3.50 | 10 | 0 |
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| 1959 | 52.3 | 60 | 64.8 | 51 | 39.8 | 68 | 1.45 | 52 | 0 |
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| 1958 | 59.3 | 1 | 72.9 | 1 | 45.7 | 3 | 1.47 | 51 | 0 |
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| 1957 | 57.6 | 4 | 69.5 | 11 | 45.7 | 3 | 1.42 | 54 | 0 |
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| 1956 | 57.2 | 8 | 71 | 5 | 43.5 | 19 | 0.30 | 75 | 0 |
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| 1955 | 51 | 72 | 62.2 | 68 | 39.8 | 68 | 1.35 | 57 | 0 |
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| 1954 | 52.9 | 49 | 65.9 | 39 | 39.9 | 66 | 1.63 | 44 | 0 |
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| 1953 | 52.8 | 51 | 64.2 | 55 | 41.4 | 44 | 2.72 | 23 | 0 |
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| 1952 | 53.8 | 35 | 67.1 | 25 | 40.5 | 56 | 0.85 | 68 | 0 |
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| 1951 | 53.6 | 40 | 66.4 | 37 | 40.8 | 50 | 1.91 | 37 | 0 |
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| 1950 | 51.1 | 69 | 63.8 | 59 | 38.4 | 76 | 0.79 | 70 | 0 |
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| 1949 | 56.5 | 13 | 70.4 | 8 | 42.5 | 27 | 1.54 | 46 | 0 |
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| 1948 | 52.5 | 56 | 63.3 | 61 | 41.7 | 37 | 5.83 | 1 | 0 |
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