Franklin, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.6 °F (low) to 63.6 °F (high). Annual precipitation averages 41.1 Inches. Franklin is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.8 °F | 37.8 °F | 3.07 in. |
| February | 23.6 °F | 41.5 °F | 2.4 in. |
| March | 31.9 °F | 51.7 °F | 3.47 in. |
| April | 42.1 °F | 64.3 °F | 4.33 in. |
| May | 53.0 °F | 74.2 °F | 4.46 in. |
| June | 61.9 °F | 82.3 °F | 4.55 in. |
| July | 65.2 °F | 85.6 °F | 3.87 in. |
| August | 63.3 °F | 84.8 °F | 3.02 in. |
| September | 55.6 °F | 79.0 °F | 2.84 in. |
| October | 43.7 °F | 66.8 °F | 2.96 in. |
| November | 33.7 °F | 53.2 °F | 2.92 in. |
| December | 26.9 °F | 42.2 °F | 3.23 in. |
| Annual | 43.6 °F | 63.6 °F | 41.12 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |