| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual Monthly |
|
| Mean Max. Temperature (F) | 18.8 | 25.5 | 35.6 | 48.8 | 63.1 | 72.5 | 77.7 | 76.0 | 66.0 | 54.1 | 37.1 | 23.4 | 49.9 |
| Highest Mean Max. Temperature (F) | 29.9 | 34.9 | 44.9 | 59.2 | 70.9 | 81.1 | 83.9 | 81.6 | 70.0 | 60.5 | 47.2 | 31.1 | 83.9 |
| Year Highest Occurred | 1990 | 1998 | 2000 | 1987 | 1988 | 1988 | 1988 | 1983 | 1998 | 1971 | 1999 | 1999 | 1988 |
| Lowest Mean Max. Temperature (F) | 8.7 | 16.2 | 28.6 | 36.2 | 53.5 | 65.0 | 69.7 | 69.2 | 60.1 | 48.0 | 29.6 | 13.4 | 8.7 |
| Year Lowest Occurred | 1982 | 1979 | 1974 | 1975 | 1997 | 1998 | 1992 | 1982 | 1993 | 1974 | 1995 | 1983 | 1982 |
| Mean Temperature (F) | 9.6 | 15.9 | 26.6 | 39.0 | 50.8 | 60.0 | 66.1 | 65.2 | 56.0 | 45.0 | 30.2 | 15.5 | 40.0 |
| Highest Mean Temperature (F) | 21.1 | 30.6 | 35.3 | 46.0 | 55.8 | 65.3 | 72.0 | 71.6 | 61.0 | 51.3 | 39.0 | 23.4 | 72.0 |
| Year Highest Occurred | 1990 | 1998 | 2000 | 1987 | 1998 | 1988 | 1983 | 1983 | 1998 | 1971 | 1999 | 1999 | 1983 |
| Lowest Mean Temperature (F) | -1.7 | 5.3 | 20.1 | 30.0 | 45.3 | 55.6 | 59.5 | 59.8 | 50.4 | 38.9 | 23.0 | 4.3 | -1.7 |
| Year Lowest Occurred | 1977 | 1979 | 1996 | 1975 | 1979 | 1982 | 1992 | 1977 | 1974 | 1976 | 1995 | 1976 | 1977 |
| Mean Min. Temperature (F) | 0.4 | 6.2 | 17.6 | 29.2 | 38.4 | 47.4 | 54.5 | 54.4 | 46.0 | 35.9 | 23.2 | 7.6 | 30.1 |
| Highest Mean Min. Temperature (F) | 12.2 | 26.3 | 27.3 | 36.0 | 47.0 | 53.9 | 61.1 | 61.6 | 53.3 | 42.2 | 30.7 | 15.6 | 61.6 |
| Year Highest Occurred | 1990 | 1998 | 1973 | 1998 | 1998 | 1997 | 1983 | 1983 | 1997 | 1971 | 1999 | 1999 | 1983 |
| Lowest Mean Min. Temperature (F) | -12.9 | -6.3 | 10.4 | 23.8 | 34.0 | 43.8 | 49.1 | 47.7 | 39.3 | 26.7 | 16.0 | -7.0 | -12.9 |
| Year Lowest Occurred | 1977 | 1989 | 1971 | 1975 | 1973 | 1985 | 1971 | 1977 | 1974 | 1976 | 1976 | 1976 | 1977 |
| Mean Precipitation (in.) | 1.15 | 0.79 | 1.91 | 2.06 | 2.72 | 3.56 | 4.13 | 3.60 | 3.46 | 2.38 | 1.75 | 1.14 | 28.65 |
| Highest Precipitation (in.) | 3.17 | 2.62 | 4.21 | 4.46 | 5.57 | 7.54 | 10.39 | 7.22 | 11.04 | 5.49 | 4.42 | 3.16 | 11.04 |
| Year Highest Occurred | 1996 | 1981 | 1977 | 1981 | 1985 | 1984 | 1982 | 1978 | 1985 | 1995 | 1983 | 1998 | 1985 |
| Lowest Precipitation (in.) | 0.20 | 0.10 | 0.31 | 0.43 | 0.39 | 1.36 | 1.29 | 1.10 | 0.41 | 0.36 | 0.27 | 0.13 | 0.10 |
| Year Lowest Occurred | 1981 | 1993 | 1999 | 1988 | 1976 | 1995 | 1981 | 1997 | 1997 | 1976 | 1997 | 1997 | 1993 |
| Heating Degree Days (F) | 1718. | 1375. | 1190. | 780. | 443. | 174. | 81. | 89. | 280. | 619. | 1047. | 1534. | 9330. |
| Cooling Degree Days (F) | 0. | 0. | 0. | 0. | 2. | 23. | 117. | 95. | 9. | 0. | 0. | 0. | 246. |