Every May in Hayward, WI 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 | 54.6 | 26 | 67.6 | 30 | 41.1 | 25 | | | 2 |
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| 2025 | 55.7 | 18 | 70.2 | 18 | 41.3 | 20 | | | 0 |
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| 2024 | | | | | | | | | 16 |
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| 2023 | 56.3 | 16 | 71.5 | 12 | 41.2 | 22 | 0.95 | 111 | 0 |
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| 2022 | 54.9 | 24 | 68.1 | 27 | 41.7 | 16 | 4.38 | 33 | 0 |
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| 2021 | 53.5 | 32 | 66.7 | 34 | 40.3 | 30 | 2.44 | 82 | 0 |
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| 2020 | 52.5 | 37 | 64.5 | 44 | 40.5 | 28 | 4.23 | 37 | 0 |
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| 2019 | 49.8 | 50 | 62.9 | 52 | 36.7 | 47 | 6.37 | 6 | 0 |
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| 2018 | 60.4 | 2 | 75.9 | 2 | 44.8 | 6 | 5.56 | 13 | 0 |
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| 2017 | 51.5 | 40 | 63.8 | 47 | 39.3 | 36 | 5.95 | 10 | 0 |
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| 2016 | 54.7 | 25 | 69 | 23 | 40.3 | 30 | 3.75 | 51 | 1 |
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| 2015 | 53.9 | 28 | 66.6 | 36 | 41.2 | 22 | 3.31 | 60 | 0 |
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| 2014 | | | | | | | 3.87 | 46 | 4 |
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| 2013 | 51.2 | 45 | 63.8 | 47 | 38.7 | 37 | 3.62 | 53 | 2 |
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| 2012 | 56.9 | 14 | 70.2 | 18 | 43.6 | 9 | 7.25 | 2 | 0 |
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| 2011 | 52.3 | 38 | 64.4 | 45 | 40.2 | 32 | 3.81 | 49 | 0 |
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| 2010 | 55.3 | 20 | 69.6 | 21 | 41 | 27 | 2.12 | 88 | 0 |
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| 2009 | 51.3 | 43 | 66.7 | 34 | 36.6 | 48 | 1.14 | 108 | 1 |
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| 2008 | 51.4 | 42 | 66.4 | 38 | 36.5 | 49 | 3.35 | 59 | 0 |
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| 2007 | 60.3 | 3 | 73.5 | 7 | 47 | 2 | 2.47 | 81 | 0 |
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| 2006 | 59.1 | 7 | 72 | 9 | 46.3 | 3 | 1.67 | 101 | 0 |
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| 2005 | 51.5 | 40 | 63 | 51 | 40.1 | 34 | 2.94 | 69 | 1 |
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| 2004 | 50 | 49 | 61.9 | 56 | 38 | 39 | 5.34 | 16 | 0 |
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| 2003 | 50.9 | 46 | 65.6 | 40 | 36.3 | 51 | 3.80 | 50 | 0 |
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| 2002 | 47.9 | 55 | 60.6 | 58 | 35.2 | 54 | 3.85 | 47 | 0 |
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| 2001 | 53.9 | 28 | 66.5 | 37 | 41.3 | 20 | 2.87 | 74 | 0 |
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| 2000 | 55.1 | 23 | 69 | 23 | 41.2 | 22 | 3.05 | 67 | 1 |
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| 1999 | 55.9 | 17 | 68.8 | 25 | 43 | 11 | 5.42 | 15 | 0 |
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| 1998 | 57.6 | 11 | 73.6 | 6 | 41.7 | 16 | 3.30 | 61 | 0 |
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| 1997 | | | | | | | 2.19 | 86 | 31 |
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| 1996 | | | | | | | 3.52 | 56 | 31 |
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| 1995 | | | | | | | 4.55 | 30 | 31 |
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| 1994 | | | | | | | 2.24 | 85 | 31 |
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| 1993 | | | | | | | 5.65 | 12 | 31 |
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| 1992 | | | | | | | 1.68 | 99 | 31 |
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| 1991 | | | | | | | 6.82 | 4 | 31 |
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| 1990 | | | | | | | 1.74 | 97 | 31 |
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| 1989 | | | | | | | 4.13 | 40 | 31 |
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| 1988 | | | | | | | 1.54 | 103 | 31 |
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| 1987 | | | | | | | 3.20 | 65 | 31 |
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| 1986 | | | | | | | 2.92 | 72 | 31 |
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| 1985 | | | | | | | 4.31 | 36 | 31 |
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| 1984 | | | | | | | 2.34 | 83 | 31 |
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| 1983 | | | | | | | 1.73 | 98 | 31 |
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| 1982 | | | | | | | 4.03 | 44 | 31 |
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| 1981 | | | | | | | 1.56 | 102 | 31 |
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| 1980 | | | | | | | 1.19 | 107 | 31 |
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| 1979 | | | | | | | 3.51 | 57 | 31 |
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| 1978 | | | | | | | 2.56 | 79 | 31 |
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| 1977 | | | | | | | 5.01 | 25 | 31 |
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| 1976 | | | | | | | 0.67 | 113 | 31 |
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| 1975 | | | | | | | 4.52 | 31 | 31 |
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| 1974 | | | | | | | 2.94 | 69 | 31 |
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| 1973 | | | | | | | 5.34 | 16 | 31 |
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| 1972 | | | | | | | 3.25 | 64 | 31 |
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| 1971 | | | | | | | 3.61 | 54 | 31 |
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| 1970 | | | | | | | 3.85 | 47 | 31 |
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| 1969 | | | | | | | 1.26 | 105 | 31 |
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| 1968 | | | | | | | 3.94 | 45 | 31 |
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| 1967 | | | | | | | 2.11 | 89 | 31 |
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| 1966 | | | | | | | 1.24 | 106 | 31 |
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| 1965 | | | | | | | 6.96 | 3 | 31 |
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| 1964 | | | | | | | 4.59 | 29 | 31 |
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| 1963 | | | | | | | 3.03 | 68 | 31 |
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| 1962 | | | | | | | 6.01 | 9 | 31 |
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| 1961 | | | | | | | 4.16 | 38 | 31 |
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| 1960 | | | | | | | 5.16 | 22 | 31 |
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| 1959 | | | | | | | 5.44 | 14 | 31 |
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| 1958 | | | | | | | 1.81 | 95 | 31 |
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| 1957 | | | | | | | 2.71 | 75 | 31 |
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| 1956 | | | | | | | 4.14 | 39 | 31 |
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| 1955 | | | | | | | 1.92 | 94 | 31 |
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| 1954 | | | | | | | 5.24 | 19 | 31 |
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| 1953 | | | | | | | 5.32 | 18 | 31 |
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| 1951 | | | | | | | 4.90 | 26 | 31 |
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| 1950 | | | | | | | 4.06 | 42 | 31 |
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| 1949 | | | | | | | 4.13 | 40 | 31 |
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| 1948 | | | | | | | 0.74 | 112 | 31 |
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| 1947 | | | | | | | 3.29 | 63 | 31 |
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| 1946 | | | | | | | 1.76 | 96 | 31 |
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| 1944 | | | | | | | 6.36 | 7 | 31 |
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| 1943 | | | | | | | 3.65 | 52 | 31 |
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| 1942 | | | | | | | 5.75 | 11 | 31 |
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| 1940 | 52.6 | 34 | 67 | 32 | 37.8 | 40 | 4.32 | 35 | 1 |
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| 1939 | 59.3 | 5 | 74.3 | 5 | 43.9 | 8 | 5.19 | 21 | 2 |
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| 1938 | | | | | | | 6.47 | 5 | 13 |
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| 1937 | | | | | | | 6.04 | 8 | 14 |
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| 1936 | | | | | | | | | 9 |
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| 1935 | | | | | | | 2.04 | 92 | 11 |
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| 1934 | 61.4 | 1 | 77 | 1 | 45.7 | 4 | 1.68 | 99 | 0 |
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| 1933 | | | | | | | 2.10 | 90 | 31 |
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| 1923 | 53.7 | 31 | 70.9 | 15 | 36.4 | 50 | 3.30 | 61 | 0 |
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| 1922 | 58.6 | 9 | 74.7 | 3 | 42.5 | 15 | 4.05 | 43 | 2 |
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| 1921 | 57.2 | 12 | 71.5 | 12 | 42.8 | 12 | 2.69 | 76 | 0 |
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| 1920 | 52.6 | 34 | 69.2 | 22 | 36.1 | 53 | 2.10 | 90 | 0 |
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| 1919 | 52.8 | 33 | 68.4 | 26 | 37.3 | 44 | 2.01 | 93 | 0 |
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| 1918 | 56.8 | 15 | 70.4 | 17 | 42.7 | 13 | 9.23 | 1 | 2 |
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| 1917 | 48.6 | 54 | 66.8 | 33 | 30.5 | 56 | 1.01 | 110 | 0 |
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| 1916 | 50.9 | 46 | 64.1 | 46 | 37.7 | 41 | 3.46 | 58 | 0 |
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| 1915 | 49.7 | 51 | 62.5 | 55 | 36.9 | 45 | 5.23 | 20 | 0 |
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| 1914 | 58.7 | 8 | 71.7 | 11 | 44 | 7 | 0.19 | 115 | 2 |
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| 1913 | 52.3 | 38 | 66.4 | 38 | 38.2 | 38 | | | 0 |
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| 1912 | | | | | | | 4.81 | 28 | 9 |
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| 1911 | 59.2 | 6 | 73.2 | 8 | 45.1 | 5 | 2.93 | 71 | 0 |
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| 1910 | | | | | | | 3.20 | 65 | 7 |
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| 1909 | 50.7 | 48 | 63.3 | 49 | 37.6 | 42 | 2.92 | 72 | 3 |
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| 1908 | 52.6 | 34 | 65.3 | 42 | 40 | 35 | 3.59 | 55 | 2 |
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| 1907 | 43.5 | 56 | 56.2 | 59 | 30.7 | 55 | 2.14 | 87 | 0 |
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| 1906 | | | 62.8 | 53 | | | 4.33 | 34 | 5 |
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| 1905 | 49.6 | 52 | 62.6 | 54 | 36.8 | 46 | 2.68 | 77 | 2 |
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| 1904 | | | 65.4 | 41 | | | 2.60 | 78 | 5 |
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| 1903 | 55.2 | 22 | 67.7 | 28 | 42.7 | 13 | | | 0 |
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| 1902 | 57.2 | 12 | 70.9 | 15 | 43.1 | 10 | 1.28 | 104 | 1 |
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| 1901 | 55.7 | 18 | 71.4 | 14 | 40.2 | 32 | 1.07 | 109 | 1 |
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| 1900 | 58 | 10 | 74.6 | 4 | 41.5 | 18 | 0.32 | 114 | 0 |
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| 1899 | 54.5 | 27 | 67.5 | 31 | 41.5 | 18 | 4.84 | 27 | 0 |
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| 1898 | 55.3 | 20 | 70.2 | 18 | 40.4 | 29 | 5.07 | 24 | 0 |
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| 1897 | 51.3 | 43 | 65.1 | 43 | 37.6 | 42 | 2.34 | 83 | 0 |
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| 1896 | 60.3 | 3 | 72 | 9 | 48.6 | 1 | 5.10 | 23 | 0 |
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| 1895 | 53.9 | 28 | 67.7 | 28 | 41.1 | 25 | 4.52 | 31 | 2 |
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| 1894 | | | 63.1 | 50 | | | | | 8 |
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| 1893 | 48.8 | 53 | 61.6 | 57 | 36.3 | 51 | 2.50 | 80 | 2 |
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