Every May in Wilmington, OH from 1915 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 | 60.2 | 66 | 70.1 | 82 | 50.4 | 52 | 4.03 | 55 | 0 |
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| 2025 | 59.8 | 72 | 68.6 | 98 | 51 | 46 | 6.18 | 27 | 0 |
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| 2024 | 67.8 | 6 | 77.4 | 22 | 58.3 | 2 | 3.27 | 72 | 0 |
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| 2023 | 62.2 | 54 | 73.5 | 53 | 50.8 | 49 | 2.39 | 92 | 0 |
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| 2022 | 65.8 | 15 | 75.7 | 34 | 55.8 | 8 | 7.89 | 10 | 0 |
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| 2021 | 59.9 | 71 | 70.9 | 73 | 48.9 | 69 | 2.90 | 81 | 0 |
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| 2020 | 59.2 | 78 | 68.5 | 99 | 49.8 | 60 | 3.68 | 63 | 1 |
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| 2019 | 64.9 | 26 | 74.5 | 44 | 55.3 | 10 | 3.78 | 60 | 0 |
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| 2018 | 70.1 | 1 | 80.7 | 4 | 59.5 | 1 | 2.84 | 83 | 0 |
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| 2017 | 61.9 | 56 | 71.7 | 69 | 52.2 | 29 | 3.70 | 62 | 0 |
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| 2016 | 61 | 60 | 70.7 | 76 | 51.3 | 43 | 4.29 | 47 | 0 |
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| 2015 | 66.9 | 9 | 77.9 | 19 | 55.9 | 6 | 1.12 | 107 | 0 |
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| 2014 | 63 | 43 | 73.6 | 51 | 52.3 | 28 | 4.17 | 50 | 0 |
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| 2013 | 64.7 | 28 | 74.2 | 48 | 55.2 | 11 | 2.92 | 80 | 0 |
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| 2012 | 68.1 | 5 | 79.1 | 11 | 57.2 | 4 | 4.09 | 53 | 0 |
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| 2011 | 63.1 | 42 | 71.8 | 68 | 54.4 | 17 | 6.22 | 26 | 0 |
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| 2010 | 64.7 | 28 | 74.5 | 44 | 54.8 | 14 | 4.33 | 45 | 0 |
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| 2009 | 62.9 | 45 | 73.2 | 57 | 52.6 | 24 | 3.22 | 73 | 0 |
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| 2008 | 59.1 | 81 | 69.5 | 88 | 48.8 | 70 | 5.32 | 37 | 0 |
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| 2007 | 65.6 | 16 | 78.2 | 17 | 53 | 22 | 2.07 | 96 | 0 |
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| 2006 | 60.2 | 66 | 70.5 | 78 | 49.8 | 60 | 3.29 | 70 | 0 |
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| 2005 | 57.9 | 94 | 69.7 | 84 | 46.1 | 96 | 1.94 | 99 | 0 |
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| 2004 | 66.6 | 10 | 76.7 | 27 | 56.4 | 5 | 7.34 | 13 | 0 |
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| 2003 | 60.8 | 63 | 69.5 | 88 | 52.1 | 31 | 6.23 | 25 | 0 |
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| 2002 | 57.3 | 97 | 68.1 | 100 | 46.4 | 91 | 9.85 | 3 | 3 |
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| 2001 | 62.8 | 47 | 73.5 | 53 | 52.1 | 31 | 7.05 | 15 | 0 |
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| 2000 | 64.7 | 28 | 75.3 | 36 | 54.1 | 18 | 3.28 | 71 | 0 |
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| 1999 | 62.4 | 51 | 74.9 | 40 | 49.9 | 58 | 1.43 | 104 | 0 |
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| 1998 | 65 | 23 | 75.2 | 38 | 54.7 | 15 | 7.47 | 12 | 0 |
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| 1997 | 56.1 | 104 | 66.1 | 106 | 46.2 | 95 | 5.06 | 41 | 0 |
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| 1996 | 60.4 | 65 | 69.2 | 93 | 51.5 | 39 | 9.41 | 6 | 0 |
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| 1995 | 59.3 | 77 | 69.5 | 88 | 49.2 | 64 | 8.43 | 8 | 0 |
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| 1994 | 58 | 92 | 68.9 | 95 | 47.1 | 84 | 2.56 | 88 | 0 |
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| 1993 | 62.5 | 49 | 73.5 | 53 | 51.4 | 41 | 3.12 | 75 | 0 |
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| 1992 | 59.7 | 73 | 70.3 | 80 | 49.1 | 65 | 3.13 | 74 | 0 |
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| 1991 | 67.3 | 8 | 76.7 | 27 | 57.6 | 3 | 6.03 | 29 | 1 |
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| 1990 | 57.3 | 97 | 65.5 | 108 | 49.1 | 65 | 10.92 | 2 | 0 |
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| 1989 | 56.5 | 102 | 65.9 | 107 | 47.2 | 83 | 5.52 | 35 | 0 |
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| 1988 | 61 | 60 | 74.4 | 47 | 47.6 | 79 | 1.13 | 106 | 0 |
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| 1987 | 65.3 | 21 | 78.1 | 18 | 52.5 | 26 | 4.12 | 51 | 0 |
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| 1986 | 62.5 | 49 | 73.4 | 56 | 51.6 | 36 | 2.24 | 93 | 0 |
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| 1985 | 62.3 | 53 | 73.2 | 57 | 51.4 | 41 | 6.46 | 20 | 0 |
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| 1984 | 57 | 101 | 67.1 | 103 | 46.8 | 88 | 6.04 | 28 | 0 |
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| 1983 | 58.5 | 86 | 68.7 | 97 | 48.2 | 75 | 9.19 | 7 | 0 |
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| 1982 | 65.5 | 17 | 78.5 | 15 | 52.4 | 27 | 3.91 | 57 | 0 |
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| 1981 | 56.4 | 103 | 66.9 | 104 | 45.7 | 99 | 8.08 | 9 | 1 |
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| 1980 | 60 | 70 | 72.6 | 60 | 47.3 | 82 | 4.56 | 42 | 0 |
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| 1979 | 58.3 | 89 | 71.2 | 72 | 45.4 | 101 | 3.63 | 67 | 0 |
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| 1978 | 57.7 | 95 | 68 | 101 | 47.4 | 81 | 3.66 | 66 | 0 |
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| 1977 | 66 | 13 | 78.9 | 12 | 53 | 22 | 2.64 | 86 | 0 |
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| 1976 | 54 | 107 | 67.6 | 102 | 40.3 | 108 | 1.67 | 103 | 0 |
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| 1975 | 63.9 | 35 | 76.8 | 26 | 50.9 | 48 | 1.78 | 100 | 0 |
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| 1974 | | | | | | | | | 11 |
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| 1973 | 59.2 | 78 | 70.4 | 79 | 47.9 | 77 | 5.39 | 36 | 0 |
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| 1972 | 62.9 | 45 | 74.8 | 41 | 51.1 | 45 | 5.89 | 31 | 0 |
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| 1971 | 58.6 | 85 | 70.8 | 74 | 46.5 | 90 | 5.14 | 39 | 1 |
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| 1970 | 65 | 23 | 77.8 | 20 | 52.1 | 31 | 2.82 | 84 | 0 |
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| 1969 | 63.3 | 41 | 76 | 32 | 50.6 | 50 | 3.87 | 59 | 0 |
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| 1968 | 59 | 82 | 69.4 | 91 | 48.6 | 72 | 12.96 | 1 | 0 |
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| 1967 | 58.1 | 91 | 69.7 | 84 | 46.4 | 91 | 7.70 | 11 | 0 |
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| 1966 | 58.4 | 88 | 70.7 | 76 | 46.1 | 96 | 3.01 | 78 | 0 |
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| 1965 | 68.5 | 2 | 81.3 | 2 | 55.6 | 9 | 3.04 | 77 | 0 |
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| 1964 | 65.2 | 22 | 77.8 | 20 | 52.6 | 24 | 1.05 | 109 | 0 |
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| 1963 | 60.1 | 68 | 72.6 | 60 | 47.6 | 79 | 2.46 | 90 | 0 |
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| 1962 | 68.2 | 3 | 80.5 | 6 | 55.9 | 6 | 2.94 | 79 | 0 |
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| 1961 | 57.1 | 100 | 69.6 | 87 | 44.7 | 103 | 5.19 | 38 | 0 |
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| 1960 | 58.9 | 83 | 69.7 | 84 | 48.1 | 76 | 6.38 | 21 | 0 |
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| 1959 | 66.6 | 10 | 78.4 | 16 | 54.9 | 13 | 4.26 | 48 | 0 |
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| 1958 | 61.3 | 58 | 73.6 | 51 | 49 | 68 | 4.31 | 46 | 0 |
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| 1957 | 63 | 43 | 75.3 | 36 | 50.2 | 55 | 6.34 | 23 | 2 |
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| 1956 | 61.5 | 57 | 73.2 | 57 | 50 | 57 | 4.11 | 52 | 1 |
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| 1955 | 63.5 | 39 | 75.2 | 38 | 51.7 | 35 | 1.96 | 97 | 1 |
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| 1954 | 57.3 | 97 | 69.1 | 94 | 45.5 | 100 | 2.72 | 85 | 0 |
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| 1953 | 64.3 | 32 | 75.5 | 35 | 53.1 | 21 | 4.54 | 43 | 0 |
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| 1952 | 61 | 60 | 72.2 | 63 | 49.9 | 58 | 4.22 | 49 | 0 |
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| 1951 | 63.8 | 37 | 77.3 | 23 | 50.2 | 55 | 4.03 | 55 | 1 |
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| 1950 | 64 | 34 | 76.7 | 27 | 51.2 | 44 | 4.06 | 54 | 0 |
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| 1949 | 64.7 | 28 | 79.2 | 10 | 50.3 | 54 | 2.60 | 87 | 0 |
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| 1948 | 61.1 | 59 | 73.9 | 50 | 48.3 | 74 | 3.60 | 68 | 0 |
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| 1947 | 59.4 | 76 | 72.4 | 62 | 46.4 | 91 | 5.74 | 33 | 0 |
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| 1946 | 60.5 | 64 | 71.9 | 66 | 49.1 | 65 | 6.26 | 24 | 0 |
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| 1945 | 57.4 | 96 | 70.3 | 80 | 44.5 | 105 | 5.67 | 34 | 0 |
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| 1944 | 68.2 | 3 | 81.9 | 1 | 54.5 | 16 | 3.11 | 76 | 0 |
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| 1943 | 63.4 | 40 | 74.6 | 43 | 52.1 | 31 | 5.08 | 40 | 0 |
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| 1942 | 64.1 | 33 | 76.5 | 31 | 51.6 | 36 | 3.89 | 58 | 0 |
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| 1941 | 64.8 | 27 | 80.1 | 8 | 49.5 | 63 | 2.47 | 89 | 0 |
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| 1940 | 58.9 | 83 | 70.8 | 74 | 46.9 | 86 | 3.67 | 64 | 0 |
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| 1939 | 66.3 | 12 | 80.9 | 3 | 51.6 | 36 | 1.95 | 98 | 0 |
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| 1938 | 63.9 | 35 | 77.2 | 24 | 50.5 | 51 | 6.79 | 18 | 0 |
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| 1937 | 62.2 | 54 | 74.8 | 41 | 49.7 | 62 | 3.39 | 69 | 0 |
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| 1936 | 65.4 | 20 | 79.8 | 9 | 51 | 46 | 2.15 | 94 | 0 |
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| 1935 | 58 | 92 | 69.3 | 92 | 46.6 | 89 | 6.77 | 19 | 0 |
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| 1934 | 65.5 | 17 | 80.7 | 4 | 50.4 | 52 | 0.54 | 111 | 0 |
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| 1933 | 65 | 23 | 76.6 | 30 | 53.3 | 19 | 9.79 | 4 | 0 |
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| 1932 | 62.8 | 47 | 77.2 | 24 | 48.5 | 73 | 0.94 | 110 | 0 |
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| 1931 | 58.2 | 90 | 70.1 | 82 | 46.3 | 94 | 2.14 | 95 | 0 |
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| 1930 | 65.5 | 17 | 78.8 | 13 | 52.2 | 29 | 1.35 | 105 | 0 |
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| 1929 | 59.5 | 75 | 71.9 | 66 | 47.1 | 84 | 7.25 | 14 | 0 |
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| 1928 | 58.5 | 86 | 72.1 | 64 | 44.9 | 102 | 1.11 | 108 | 1 |
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| 1927 | | | 72 | 65 | | | 6.95 | 16 | 4 |
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| 1926 | 62.4 | 51 | 75.9 | 33 | 48.8 | 70 | 1.69 | 102 | 0 |
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| 1925 | 56 | 105 | 68.9 | 95 | 42.9 | 106 | 2.42 | 91 | 1 |
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| 1924 | 55.8 | 106 | 66.8 | 105 | 44.7 | 103 | 6.80 | 17 | 0 |
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| 1923 | 60.1 | 68 | 74 | 49 | 46.1 | 96 | 2.90 | 81 | 3 |
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| 1922 | 66 | 13 | 78.8 | 13 | 53.2 | 20 | 3.73 | 61 | 0 |
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| 1921 | 63.6 | 38 | 74.5 | 44 | 51.5 | 39 | 1.75 | 101 | 2 |
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| 1920 | 59.2 | 78 | 71.5 | 70 | 46.9 | 86 | 3.67 | 64 | 0 |
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| 1919 | 59.6 | 74 | 71.5 | 70 | 47.7 | 78 | 6.35 | 22 | 0 |
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| 1918 | 67.8 | 6 | 80.5 | 6 | 55 | 12 | 4.41 | 44 | 1 |
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| 1917 | 54 | 107 | 65.2 | 109 | 42.8 | 107 | 5.90 | 30 | 0 |
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| 1916 | | | | | | | 5.77 | 32 | 31 |
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| 1915 | | | | | | | 9.79 | 4 | 31 |
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