Franklin Furnace, Ohio has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 43.1 °F (low) to 66.4 °F (high). Annual precipitation averages 42.7 Inches. Franklin Furnace is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.1 °F | 42.2 °F | 3.19 in. |
| February | 24.8 °F | 46.0 °F | 3.12 in. |
| March | 31.3 °F | 55.6 °F | 4.03 in. |
| April | 41.1 °F | 68.1 °F | 3.72 in. |
| May | 51.5 °F | 76.3 °F | 4.48 in. |
| June | 60.3 °F | 83.4 °F | 4.06 in. |
| July | 64.2 °F | 86.6 °F | 4.51 in. |
| August | 62.5 °F | 86.1 °F | 3.21 in. |
| September | 55.0 °F | 80.4 °F | 3.28 in. |
| October | 43.0 °F | 69.4 °F | 2.99 in. |
| November | 32.7 °F | 56.5 °F | 2.68 in. |
| December | 27.3 °F | 46.0 °F | 3.39 in. |
| Annual | 43.1 °F | 66.4 °F | 42.66 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |