| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual Monthly |
|
| Mean Max. Temperature (F) | 19.6 | 27.2 | 37.9 | 53.7 | 68.9 | 76.6 | 80.8 | 77.8 | 67.8 | 54.9 | 36.4 | 23.5 | 52.1 |
| Highest Mean Max. Temperature (F) | 31.5 | 36.8 | 47.0 | 65.4 | 76.6 | 84.1 | 89.0 | 83.8 | 74.7 | 59.7 | 46.4 | 30.9 | 89.0 |
| Year Highest Occurred | 1990 | 1998 | 2000 | 1987 | 1988 | 1988 | 1988 | 1983 | 1998 | 1973 | 1999 | 1999 | 1988 |
| Lowest Mean Max. Temperature (F) | 9.6 | 17.8 | 31.6 | 44.4 | 60.6 | 70.5 | 73.1 | 72.6 | 61.1 | 50.5 | 28.6 | 12.8 | 9.6 |
| Year Lowest Occurred | 1994 | 1989 | 1996 | 1975 | 1997 | 1993 | 1992 | 1985 | 1993 | 1987 | 1995 | 1983 | 1994 |
| Mean Temperature (F) | 9.1 | 15.9 | 26.8 | 40.7 | 53.7 | 62.0 | 67.3 | 65.2 | 56.0 | 44.4 | 28.4 | 14.4 | 40.3 |
| Highest Mean Temperature (F) | 20.8 | 29.7 | 35.0 | 48.3 | 59.8 | 67.2 | 72.4 | 70.3 | 61.1 | 49.5 | 37.3 | 24.2 | 72.4 |
| Year Highest Occurred | 1990 | 1998 | 2000 | 1987 | 1977 | 1988 | 1988 | 1983 | 1998 | 1971 | 1999 | 1997 | 1988 |
| Lowest Mean Temperature (F) | -2.2 | 5.0 | 20.3 | 33.6 | 47.3 | 56.8 | 61.3 | 60.2 | 50.7 | 38.6 | 21.1 | 2.1 | -2.2 |
| Year Lowest Occurred | 1982 | 1989 | 1996 | 1975 | 1997 | 1985 | 1992 | 1977 | 1993 | 1976 | 1995 | 1983 | 1982 |
| Mean Min. Temperature (F) | -1.4 | 4.5 | 15.7 | 27.6 | 38.4 | 47.3 | 53.7 | 52.5 | 44.2 | 33.8 | 20.4 | 5.2 | 28.5 |
| Highest Mean Min. Temperature (F) | 10.2 | 22.6 | 24.8 | 31.6 | 43.6 | 51.4 | 58.3 | 56.8 | 47.6 | 39.4 | 28.2 | 17.6 | 58.3 |
| Year Highest Occurred | 1990 | 1998 | 1973 | 1986 | 1991 | 1995 | 1987 | 1983 | 1996 | 1971 | 1999 | 1997 | 1987 |
| Lowest Mean Min. Temperature (F) | -15.0 | -7.8 | 7.4 | 22.8 | 33.4 | 41.9 | 49.5 | 47.5 | 38.0 | 26.0 | 13.2 | -8.7 | -15.0 |
| Year Lowest Occurred | 1982 | 1989 | 1980 | 1975 | 1983 | 1985 | 1992 | 1977 | 1974 | 1976 | 1976 | 1983 | 1982 |
| Mean Precipitation (in.) | 1.18 | 0.81 | 1.72 | 2.02 | 3.27 | 4.25 | 4.23 | 4.45 | 4.08 | 2.62 | 2.13 | 1.02 | 31.78 |
| Highest Precipitation (in.) | 3.71 | 2.02 | 4.30 | 5.10 | 8.02 | 8.45 | 7.33 | 9.13 | 10.61 | 7.90 | 7.69 | 1.98 | 10.61 |
| Year Highest Occurred | 1975 | 1979 | 1977 | 1986 | 1991 | 1986 | 1996 | 1972 | 1990 | 1984 | 1983 | 1982 | 1990 |
| Lowest Precipitation (in.) | 0.11 | 0.18 | 0.52 | 0.15 | 0.40 | 1.10 | 1.45 | 1.60 | 0.88 | 0.31 | 0.21 | 0.17 | 0.11 |
| Year Lowest Occurred | 1981 | 1988 | 1993 | 1988 | 1976 | 1995 | 1988 | 1998 | 1974 | 1976 | 1976 | 1999 | 1981 |
| Heating Degree Days (F) | 1735. | 1377. | 1185. | 731. | 363. | 133. | 50. | 85. | 277. | 640. | 1099. | 1570. | 9245. |
| Cooling Degree Days (F) | 0. | 0. | 0. | 0. | 12. | 40. | 120. | 90. | 7. | 0. | 0. | 0. | 269. |