| May | |||||||
| Day | Normal High | Normal Low | Normal Mean | Normal Precip | Normal Snow | Record High | Record Low |
| 1 | 65 | 45 | 55 | 0.11 | 0 | 88 in 1942 | 28 in 1876 |
| 2 | 65 | 46 | 55.5 | 0.11 | 0 | 86 in 1951 | 26 in 1963 |
| 3 | 66 | 46 | 56 | 0.11 | 0.1 | 88 in 2012 | 27 in 1986 |
| 4 | 66 | 46 | 56 | 0.12 | 0 | 88 in 1949 | 28 in 1971 |
| 5 | 66 | 47 | 56.5 | 0.11 | 0 | 89 in 1949 | 30 in 1968 |
| 6 | 67 | 47 | 57 | 0.11 | 0 | 92 in 1959 | 26 in 1968 |
| 7 | 67 | 47 | 57 | 0.11 | 0 | 86 in 1936 | 28 in 1970 |
| 8 | 67 | 48 | 57.5 | 0.11 | 0 | 88 in 1889 | 30 in 1976 |
| 9 | 68 | 48 | 58 | 0.11 | 0 | 88 in 1979 | 29 in 1983 |
| 10 | 68 | 48 | 58 | 0.11 | 0 | 90 in 1953 | 25 in 1966 |
| 11 | 68 | 49 | 58.5 | 0.11 | 0 | 87 in 1881 | 33 in 1977 |
| 12 | 68 | 49 | 58.5 | 0.12 | 0 | 89 in 1881 | 32 in 1976 |
| 13 | 69 | 49 | 59 | 0.11 | 0 | 86 in 1991 | 30 in 1996 |
| 14 | 69 | 49 | 59 | 0.12 | 0 | 91 in 1962 | 30 in 1996 |
| 15 | 69 | 50 | 59.5 | 0.12 | 0 | 89 in 1962 | 35 in 1977 |
| 16 | 70 | 50 | 60 | 0.12 | 0 | 89 in 1991 | 29 in 1984 |
| 17 | 70 | 50 | 60 | 0.12 | 0 | 90 in 1962 | 33 in 1979 |
| 18 | 70 | 51 | 60.5 | 0.12 | 0 | 91 in 1962 | 34 in 2009 |
| 19 | 70 | 51 | 60.5 | 0.13 | 0 | 88 in 1998 | 33 in 1976 |
| 20 | 71 | 51 | 61 | 0.12 | 0 | 91 in 1962 | 34 in 1981 |
| 21 | 71 | 52 | 61.5 | 0.12 | 0 | 89 in 1941 | 32 in 1895 |
| 22 | 71 | 52 | 61.5 | 0.12 | 0 | 89 in 1911 | 35 in 2002 |
| 23 | 72 | 52 | 62 | 0.13 | 0 | 90 in 1991 | 34 in 1961 |
| 24 | 72 | 53 | 62.5 | 0.12 | 0 | 89 in 1950 | 32 in 1963 |
| 25 | 72 | 53 | 62.5 | 0.13 | 0 | 90 in 2012 | 35 in 1956 |
| 26 | 73 | 53 | 63 | 0.12 | 0 | 89 in 1914 | 34 in 1969 |
| 27 | 73 | 54 | 63.5 | 0.12 | 0 | 90 in 1967 | 35 in 1969 |
| 28 | 73 | 54 | 63.5 | 0.12 | 0 | 92 in 2012 | 37 in 1971 |
| 29 | 73 | 54 | 63.5 | 0.13 | 0 | 91 in 1991 | 37 in 2008 |
| 30 | 74 | 55 | 64.5 | 0.12 | 0 | 92 in 1879 | 32 in 1961 |
| 31 | 74 | 55 | 64.5 | 0.13 | 0 | 92 in 1944 | 39 in 1996 |
| 71.1 | 50.1 | 59.9 | 3.66 | 0.1 | |||