Every May in Jamestown, NY from 1896 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 | 52.8 | 80 | 64 | 86 | 41.6 | 76 | 4.68 | 25 | 1 |
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| 2025 | 56.2 | 53 | 66.2 | 75 | 46.3 | 30 | 5.21 | 18 | 0 |
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| 2024 | 61.4 | 8 | 73.5 | 13 | 49.4 | 8 | 2.93 | 63 | 0 |
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| 2023 | 54.4 | 72 | 68.9 | 53 | 39.8 | 84 | 1.79 | 89 | 0 |
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| 2022 | 59.2 | 21 | 71.7 | 26 | 46.7 | 27 | 5.24 | 17 | 0 |
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| 2021 | 55.1 | 66 | 67.5 | 64 | 42.7 | 67 | 2.44 | 74 | 0 |
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| 2020 | 55.2 | 65 | 66.6 | 70 | 43.8 | 51 | 3.15 | 56 | 0 |
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| 2019 | 57.4 | 41 | 68.7 | 54 | 46.1 | 32 | 3.94 | 38 | 0 |
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| 2018 | 62.6 | 5 | 75.8 | 4 | 49.5 | 7 | 4.55 | 29 | 0 |
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| 2017 | 55.7 | 60 | 65.8 | 78 | 45.6 | 38 | 5.00 | 20 | 0 |
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| 2016 | 55.5 | 62 | 67.8 | 59 | 43.1 | 56 | 2.07 | 83 | 0 |
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| 2015 | 60.1 | 15 | 73.4 | 16 | 46.8 | 26 | 3.75 | 42 | 0 |
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| 2014 | 56.5 | 49 | 67.7 | 61 | 45.3 | 41 | 9.75 | 1 | 0 |
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| 2013 | 57.8 | 34 | 71.1 | 31 | 44.6 | 47 | 4.67 | 27 | 0 |
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| 2012 | 61.2 | 9 | 75.1 | 7 | 47.3 | 21 | 3.24 | 55 | 0 |
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| 2011 | 58.8 | 27 | 69.3 | 50 | 47.9 | 15 | | | 1 |
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| 2010 | | | | | | | | | 11 |
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| 2009 | 56 | 56 | 69.9 | 43 | 42.1 | 72 | 3.68 | 44 | 0 |
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| 2008 | 50.4 | 94 | 63 | 94 | 37.3 | 95 | 2.27 | 77 | 1 |
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| 2007 | 57.1 | 44 | 71.9 | 23 | 42.3 | 70 | 2.18 | 80 | 0 |
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| 2006 | 55.5 | 62 | 68.5 | 55 | 42.4 | 68 | 2.61 | 70 | 0 |
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| 2005 | 51.1 | 89 | 64.5 | 84 | 37.9 | 91 | 2.04 | 84 | 1 |
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| 2004 | 59.8 | 17 | 71.9 | 23 | 47.6 | 17 | 8.80 | 2 | 0 |
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| 2003 | 54.3 | 73 | 65.5 | 80 | 43.1 | 56 | 3.73 | 43 | 0 |
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| 2002 | 51.2 | 87 | 64.2 | 85 | 38.2 | 90 | 6.40 | 7 | 0 |
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| 2001 | 57.2 | 42 | 70.5 | 37 | 43.5 | 54 | 3.27 | 54 | 1 |
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| 2000 | 56.7 | 48 | 69.4 | 49 | 44 | 50 | 4.05 | 37 | 0 |
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| 1999 | | | | | | | | | 11 |
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| 1998 | | | | | | | | | 11 |
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| 1997 | | | | | | | | | 9 |
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| 1996 | 54 | 75 | 65.7 | 79 | 42.9 | 64 | 5.41 | 15 | 2 |
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| 1995 | 53.1 | 79 | 63.5 | 91 | 43 | 61 | 3.40 | 51 | 1 |
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| 1994 | 50.1 | 95 | 60.4 | 99 | 39.8 | 84 | 2.66 | 67 | 0 |
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| 1993 | | | 66 | 77 | | | 0.99 | 97 | 7 |
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| 1992 | | | 63.7 | 88 | | | 1.40 | 95 | 6 |
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| 1991 | 63.3 | 2 | 78.8 | 1 | 48.4 | 11 | 2.90 | 64 | 3 |
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| 1990 | 55.7 | 60 | 68.2 | 58 | 43.1 | 56 | 6.36 | 8 | 3 |
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| 1989 | 52.8 | 80 | 63.7 | 88 | 41.9 | 74 | 5.59 | 13 | 1 |
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| 1988 | | | 73.6 | 12 | | | 4.39 | 31 | 7 |
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| 1987 | | | | | | | | | 11 |
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| 1986 | | | | | | | 1.84 | 88 | 10 |
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| 1985 | | | | | | | | | 9 |
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| 1984 | | | | | | | | | 9 |
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| 1983 | 50.7 | 92 | 63.5 | 91 | 37.8 | 92 | 5.94 | 11 | 0 |
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| 1982 | 57.6 | 38 | 72.6 | 17 | 43.1 | 56 | 4.94 | 21 | 1 |
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| 1981 | 51.9 | 85 | 66.9 | 65 | 36.8 | 96 | 4.42 | 30 | 0 |
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| 1980 | 54.9 | 68 | 69.1 | 52 | 40.6 | 82 | 1.69 | 90 | 0 |
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| 1979 | 52.8 | 80 | 66.5 | 71 | 39 | 88 | 3.53 | 49 | 0 |
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| 1978 | 53.9 | 77 | 66.4 | 74 | 41.5 | 78 | 2.99 | 60 | 0 |
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| 1977 | 55.9 | 57 | 72.6 | 17 | 39.3 | 87 | 1.55 | 93 | 0 |
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| 1976 | 50.5 | 93 | 63.3 | 93 | 37.6 | 94 | 3.33 | 52 | 0 |
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| 1975 | 57.8 | 34 | 72.5 | 19 | 43.1 | 56 | 2.71 | 65 | 0 |
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| 1974 | 51.2 | 87 | 64.7 | 82 | 37.7 | 93 | 5.25 | 16 | 0 |
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| 1962 | 60.5 | 13 | 73.5 | 13 | 47.6 | 17 | 2.63 | 68 | 0 |
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| 1961 | 54 | 75 | 66.5 | 71 | 41.6 | 76 | 4.06 | 36 | 1 |
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| 1960 | 57.7 | 36 | 67.7 | 61 | 47.7 | 16 | 4.86 | 22 | 0 |
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| 1959 | 62.9 | 4 | 75.4 | 5 | 49.8 | 4 | 1.91 | 86 | 1 |
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| 1958 | 56.1 | 55 | 69.3 | 50 | 43 | 61 | 3.02 | 59 | 0 |
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| 1957 | 57.6 | 38 | 70.6 | 36 | 44.7 | 45 | 1.85 | 87 | 0 |
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| 1956 | 55.3 | 64 | 66.8 | 67 | 43.8 | 51 | 4.35 | 32 | 0 |
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| 1955 | 61.1 | 10 | 74.6 | 9 | 47.5 | 19 | 2.59 | 71 | 0 |
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| 1954 | 54.5 | 70 | 66.7 | 69 | 42.4 | 68 | 2.14 | 82 | 0 |
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| 1953 | 59 | 23 | 69.6 | 45 | 48.4 | 11 | 6.83 | 3 | 0 |
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| 1952 | 54.5 | 70 | 66.9 | 65 | 42 | 73 | 3.62 | 47 | 0 |
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| 1951 | 59.5 | 20 | 72.4 | 20 | 46.6 | 28 | 2.99 | 60 | 0 |
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| 1950 | 59.1 | 22 | 70.8 | 33 | 47.5 | 19 | 2.23 | 78 | 0 |
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| 1949 | 58.2 | 30 | 70.5 | 37 | 45.8 | 36 | 4.25 | 33 | 0 |
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| 1948 | 55.1 | 66 | 66.2 | 75 | 44.1 | 49 | 3.66 | 46 | 0 |
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| 1947 | 54.8 | 69 | 65.3 | 81 | 44.4 | 48 | 6.69 | 5 | 0 |
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| 1946 | 57.1 | 44 | 68.3 | 57 | 45.9 | 35 | 5.04 | 19 | 0 |
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| 1945 | 52.4 | 83 | 63.6 | 90 | 41.3 | 79 | 2.70 | 66 | 0 |
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| 1944 | 65.2 | 1 | 77.4 | 2 | 53.1 | 1 | 3.94 | 38 | 0 |
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| 1943 | 56.9 | 46 | 66.5 | 71 | 47.3 | 21 | 6.67 | 6 | 0 |
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| 1942 | 61.6 | 7 | 73.7 | 11 | 49.6 | 6 | 6.00 | 10 | 0 |
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| 1941 | 59.6 | 18 | 72.1 | 21 | 47.1 | 24 | 1.69 | 90 | 0 |
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| 1940 | 58 | 33 | 69.6 | 45 | 46.5 | 29 | 4.10 | 34 | 0 |
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| 1939 | 59.6 | 18 | 71.9 | 23 | 48.3 | 13 | 1.57 | 92 | 2 |
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| 1938 | 57.2 | 42 | 69.5 | 47 | 45 | 43 | 2.63 | 68 | 0 |
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| 1937 | 58.9 | 25 | 71.7 | 26 | 46 | 34 | 2.51 | 73 | 0 |
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| 1936 | 60.6 | 12 | 74.2 | 10 | 46.9 | 25 | 2.18 | 80 | 1 |
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| 1935 | 51.4 | 86 | 62.2 | 97 | 40.6 | 82 | 2.20 | 79 | 1 |
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| 1934 | 60.9 | 11 | 75.4 | 5 | 46.3 | 30 | 1.43 | 94 | 0 |
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| 1933 | 60.2 | 14 | 71.4 | 30 | 49 | 9 | 4.76 | 23 | 1 |
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| 1932 | 58.6 | 29 | 71 | 32 | 45.7 | 37 | 3.85 | 40 | 1 |
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| 1931 | 58.8 | 27 | 72 | 22 | 45.6 | 38 | 4.10 | 34 | 0 |
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| 1930 | 58.9 | 25 | 71.7 | 26 | 46.1 | 32 | 3.68 | 44 | 1 |
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| 1929 | 56.2 | 53 | 69.5 | 47 | 42.9 | 64 | 6.20 | 9 | 0 |
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| 1928 | 56.5 | 49 | 70 | 41 | 43.3 | 55 | 1.34 | 96 | 1 |
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| 1927 | 56.9 | 46 | 68.4 | 56 | 45.4 | 40 | 5.44 | 14 | 3 |
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| 1926 | 55.9 | 57 | 70.5 | 37 | 41.3 | 79 | 0.89 | 98 | 1 |
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| 1925 | 51 | 90 | 62.4 | 96 | 39.5 | 86 | 2.37 | 75 | 1 |
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| 1924 | 52.1 | 84 | 62.2 | 97 | 41.9 | 74 | 4.68 | 25 | 1 |
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| 1923 | 55.8 | 59 | 70.7 | 35 | 40.9 | 81 | 3.59 | 48 | 0 |
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| 1918 | 62.6 | 5 | 74.8 | 8 | 50.6 | 3 | 2.52 | 72 | 1 |
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| 1908 | 59.9 | 16 | 70 | 41 | 49.7 | 5 | 5.81 | 12 | 0 |
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| 1907 | 50.9 | 91 | 63 | 94 | 38.8 | 89 | | | 0 |
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| 1906 | 58.1 | 31 | 70.8 | 33 | 44.9 | 44 | 2.98 | 62 | 1 |
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| 1905 | 56.4 | 51 | 69.9 | 43 | 42.9 | 64 | 3.04 | 58 | 0 |
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| 1904 | 57.7 | 36 | 71.7 | 26 | 43.7 | 53 | 6.77 | 4 | 0 |
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| 1903 | | | 76.3 | 3 | 43 | 61 | 2.37 | 75 | 5 |
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| 1902 | 53.4 | 78 | 64.6 | 83 | 42.2 | 71 | 3.32 | 53 | 0 |
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| 1901 | 56.3 | 52 | 67.7 | 61 | 45.1 | 42 | 3.13 | 57 | 1 |
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| 1900 | 59 | 23 | 70.4 | 40 | 47.3 | 21 | 1.95 | 85 | 3 |
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| 1899 | 58.1 | 31 | 67.8 | 59 | 48.5 | 10 | 4.76 | 23 | 0 |
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| 1898 | 57.5 | 40 | 66.8 | 67 | 48.2 | 14 | 4.61 | 28 | 1 |
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| 1897 | 54.3 | 73 | 64 | 86 | 44.7 | 45 | 3.45 | 50 | 0 |
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| 1896 | 63 | 3 | 73.5 | 13 | 52.5 | 2 | 3.77 | 41 | 0 |
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