Every May in Plattsburgh, NY 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 | | | 65.8 | 52 | 45.2 | 31 | 4.05 | 16 | 4 |
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| 2025 | 56 | 38 | 65.4 | 56 | 46.7 | 20 | 4.93 | 7 | 0 |
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| 2024 | 60.2 | 9 | 70.6 | 15 | 49.7 | 3 | 1.78 | 58 | 0 |
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| 2023 | 54.8 | 53 | 67.8 | 34 | 41.8 | 68 | 1.78 | 58 | 0 |
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| 2022 | 58 | 20 | 71 | 14 | 45 | 33 | 2.00 | 54 | 0 |
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| 2021 | 56.3 | 35 | 68 | 29 | 44.5 | 41 | 0.99 | 75 | 0 |
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| 2020 | 55 | 49 | 66.6 | 42 | 43.5 | 57 | 1.31 | 67 | 0 |
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| 2019 | 53.2 | 65 | 62.6 | 70 | 43.7 | 55 | 4.07 | 15 | 0 |
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| 2018 | 59 | 11 | 71.6 | 11 | 46.4 | 23 | 1.39 | 66 | 0 |
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| 2017 | 54.7 | 54 | 64.7 | 65 | 44.6 | 39 | 3.99 | 19 | 0 |
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| 2016 | 57 | 29 | 69.9 | 19 | 44 | 51 | 1.96 | 55 | 1 |
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| 2015 | 60.5 | 6 | 73.4 | 4 | 47.7 | 10 | 1.73 | 60 | 0 |
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| 2014 | 56.6 | 33 | 66.9 | 40 | 46.3 | 24 | 3.89 | 20 | 0 |
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| 2013 | 57.1 | 28 | 70 | 18 | 44.2 | 47 | 5.23 | 5 | 0 |
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| 2012 | 59 | 11 | 70.1 | 17 | 47.9 | 8 | 2.32 | 47 | 0 |
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| 2011 | 57.2 | 27 | 66.5 | 43 | 47.9 | 8 | 8.78 | 1 | 0 |
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| 2010 | 58.6 | 15 | 71.3 | 13 | 45.9 | 26 | 1.04 | 74 | 0 |
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| 2009 | 54.5 | 56 | 65.9 | 51 | 43.1 | 61 | 3.46 | 26 | 0 |
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| 2008 | 53.7 | 63 | 65.6 | 53 | 41.8 | 68 | 1.42 | 65 | 0 |
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| 2006 | 57 | 29 | 66.5 | 43 | 47.6 | 13 | 5.47 | 4 | 0 |
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| 2005 | 51.6 | 73 | 61 | 75 | 42.2 | 67 | 2.27 | 51 | 0 |
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| 2004 | 56.3 | 35 | 67.8 | 34 | 44.9 | 34 | 4.76 | 11 | 0 |
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| 2003 | 53.9 | 60 | 64.9 | 62 | 42.9 | 64 | 4.31 | 13 | 0 |
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| 2002 | 52.4 | 70 | 63.3 | 68 | 41.5 | 71 | 3.38 | 27 | 0 |
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| 2001 | 56.7 | 31 | 68.6 | 26 | 44.8 | 35 | 3.03 | 33 | 0 |
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| 2000 | 55.4 | 46 | 66.3 | 46 | 44.5 | 41 | 5.13 | 6 | 0 |
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| 1999 | 58.3 | 17 | 72.1 | 9 | 44.5 | 41 | 1.24 | 69 | 0 |
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| 1994 | 54 | 58 | 65.1 | 60 | 43 | 63 | 4.03 | 18 | 0 |
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| 1993 | 55.2 | 48 | 65 | 61 | 45.3 | 30 | 2.65 | 38 | 0 |
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| 1992 | 53.9 | 60 | 66.4 | 45 | 41.4 | 73 | 2.36 | 46 | 0 |
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| 1991 | 58 | 20 | 70.2 | 16 | 45.9 | 26 | 1.64 | 62 | 0 |
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| 1990 | 51.1 | 74 | 61.6 | 72 | 40.7 | 74 | 3.57 | 24 | 0 |
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| 1989 | 57.6 | 24 | 67.7 | 36 | 47.4 | 15 | 3.30 | 29 | 0 |
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| 1988 | 56 | 38 | 66.7 | 41 | 45.4 | 29 | 2.39 | 44 | 0 |
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| 1987 | 53.8 | 62 | 64.6 | 66 | 42.9 | 64 | 1.67 | 61 | 0 |
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| 1986 | 57.6 | 24 | 67.5 | 38 | 47.7 | 10 | 2.79 | 35 | 0 |
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| 1985 | 55 | 49 | 66.1 | 49 | 43.9 | 52 | 2.48 | 43 | 0 |
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| 1984 | 52.2 | 71 | 60.7 | 76 | 43.7 | 55 | 5.94 | 3 | 0 |
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| 1983 | 52.7 | 68 | 61.2 | 74 | 44.2 | 47 | 4.81 | 10 | 0 |
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| 1982 | 57.8 | 22 | 67.9 | 32 | 47.7 | 10 | 2.13 | 52 | 0 |
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| 1981 | 55.9 | 40 | 67 | 39 | 44.8 | 35 | 1.52 | 64 | 0 |
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| 1980 | 58.2 | 18 | 68.8 | 25 | 47.6 | 13 | 1.83 | 57 | 0 |
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| 1979 | 58.8 | 13 | 68.6 | 26 | 48.9 | 5 | 3.30 | 29 | 0 |
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| 1978 | 60.9 | 4 | 72.6 | 7 | 49.2 | 4 | 3.60 | 23 | 0 |
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| 1977 | 61.1 | 3 | 73.4 | 4 | 48.8 | 6 | 2.05 | 53 | 0 |
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| 1976 | 55.5 | 43 | 66.2 | 47 | 44.8 | 35 | 4.83 | 8 | 0 |
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| 1975 | 63.3 | 1 | 75.7 | 1 | 50.9 | 1 | 1.11 | 72 | 0 |
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| 1974 | 53 | 66 | 61.8 | 71 | 44.1 | 50 | 4.53 | 12 | 0 |
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| 1973 | 55.5 | 43 | 64.9 | 62 | 46 | 25 | 4.82 | 9 | 0 |
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| 1972 | 58.7 | 14 | 72 | 10 | 45.5 | 28 | | | 0 |
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| 1971 | 57.4 | 26 | 69.9 | 19 | 44.8 | 35 | 2.74 | 36 | 0 |
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| 1970 | 56.6 | 33 | 68 | 29 | 45.1 | 32 | 2.54 | 40 | 1 |
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| 1969 | 54.7 | 54 | 65.6 | 53 | 43.9 | 52 | 2.99 | 34 | 0 |
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| 1968 | 54.5 | 56 | 65.4 | 56 | 43.5 | 57 | 2.54 | 40 | 0 |
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| 1967 | 49.9 | 75 | 61.4 | 73 | 38.4 | 76 | 2.60 | 39 | 0 |
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| 1966 | 52.7 | 68 | 64.2 | 67 | 41.7 | 70 | 1.16 | 71 | 1 |
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| 1965 | 59.1 | 10 | 71.5 | 12 | 46.6 | 21 | 1.08 | 73 | 0 |
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| 1964 | 60.8 | 5 | 74.3 | 2 | 47.4 | 15 | 3.73 | 21 | 0 |
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| 1963 | 55.6 | 42 | 67.9 | 32 | 43.3 | 59 | 2.51 | 42 | 0 |
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| 1962 | 58.4 | 16 | 69.6 | 21 | 47.2 | 19 | 2.39 | 44 | 0 |
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| 1961 | 55.5 | 43 | 68 | 29 | 43.1 | 61 | 2.32 | 47 | 0 |
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| 1960 | 61.6 | 2 | 73.2 | 6 | 50 | 2 | 2.28 | 49 | 0 |
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| 1959 | 60.5 | 6 | 73.7 | 3 | 47.3 | 18 | 1.58 | 63 | 0 |
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| 1958 | 53.6 | 64 | 65.6 | 53 | 41.5 | 71 | 2.28 | 49 | 0 |
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| 1957 | 55.9 | 40 | 67.6 | 37 | 44.2 | 47 | 4.12 | 14 | 0 |
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| 1956 | 52.2 | 71 | 65.2 | 59 | 39.2 | 75 | 4.05 | 16 | 0 |
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| 1955 | 60.4 | 8 | 72.3 | 8 | 48.5 | 7 | 1.87 | 56 | 0 |
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| 1954 | 54.9 | 52 | 65.3 | 58 | 44.5 | 41 | 3.57 | 24 | 1 |
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| 1953 | 58.2 | 18 | 68.9 | 24 | 47.4 | 15 | 3.24 | 31 | 0 |
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| 1952 | 52.8 | 67 | 63.3 | 68 | 42.3 | 66 | 3.38 | 27 | 0 |
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| 1951 | 57.8 | 22 | 69.1 | 23 | 46.5 | 22 | 3.73 | 21 | 0 |
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| 1950 | 56.3 | 35 | 68.2 | 28 | 44.4 | 45 | 1.23 | 70 | 0 |
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| 1949 | 56.7 | 31 | 69.2 | 22 | 44.3 | 46 | 1.25 | 68 | 0 |
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| 1948 | 54 | 58 | 64.8 | 64 | 43.2 | 60 | 3.16 | 32 | 0 |
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| 1947 | 55.4 | 46 | 66.2 | 47 | 44.6 | 39 | 6.19 | 2 | 0 |
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| 1946 | 55 | 49 | 66.1 | 49 | 43.9 | 52 | 2.74 | 36 | 0 |
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