Old Fort, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.9 °F (low) to 60.3 °F (high). Annual precipitation averages 37.5 Inches. Old Fort is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.3 °F | 33.4 °F | 2.48 in. |
| February | 20.1 °F | 36.4 °F | 2.17 in. |
| March | 28.0 °F | 46.4 °F | 2.61 in. |
| April | 38.2 °F | 59.8 °F | 3.71 in. |
| May | 49.9 °F | 71.3 °F | 3.85 in. |
| June | 59.8 °F | 80.7 °F | 3.92 in. |
| July | 63.0 °F | 84.4 °F | 3.88 in. |
| August | 60.9 °F | 82.3 °F | 3.42 in. |
| September | 53.6 °F | 76.5 °F | 3.26 in. |
| October | 42.5 °F | 64.0 °F | 2.86 in. |
| November | 32.7 °F | 49.8 °F | 2.79 in. |
| December | 24.3 °F | 38.4 °F | 2.53 in. |
| Annual | 40.9 °F | 60.3 °F | 37.48 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |