Franklin County Average Temperature and Rainfall
| Month | Avg. High | Avg. Low | Mean | Avg. Precip. | Record High | Record Low | ||||||
| Jan | 63°F | 41°F | 52°F | 5.55 in. | 85°F (1962) | 11°F (1977) | ||||||
| Feb | 67°F | 43°F | 55°F | 4.59 in. | 86°F (1985) | 15°F (1996) | ||||||
| Mar | 73°F | 50°F | 61°F | 5.97 in. | 93°F (1989) | 20°F (1980) | ||||||
| Apr | 79°F | 54°F | 67°F | 3.43 in. | 93°F (1999) | 34°F (1987) | ||||||
| May | 86°F | 62°F | 74°F | 3.69 in. | 98°F (1998) | 41°F (1992) | ||||||
| Jun | 90°F | 68°F | 79°F | 6.45 in. | 104°F (1985) | 47°F (1984) | ||||||
| Jul | 91°F | 71°F | 81°F | 9.19 in. | 104°F (1966) | 56°F (1967) | ||||||
| Aug | 91°F | 71°F | 81°F | 8.03 in. | 100°F (1986) | 61°F (1997) | ||||||
| Sep | 88°F | 68°F | 78°F | 6.08 in. | 99°F (1984) | 41°F (1967) | ||||||
| Oct | 80°F | 56°F | 68°F | 3.28 in. | 95°F (1959) | 32°F (1981) | ||||||
| Nov | 73°F | 49°F | 61°F | 3.51 in. | 90°F (1984) | 22°F (1970) | ||||||
| Dec | 66°F | 43°F | 55°F | 3.89 in. | 85°F (1978) | 11°F (1989) | ||||||