Bellefontaine, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.7 °F (low) to 59.4 °F (high). Annual precipitation averages 43.2 Inches. Bellefontaine 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 | 17.7 °F | 32.8 °F | 3.04 in. |
| February | 19.9 °F | 36.4 °F | 2.4 in. |
| March | 28.2 °F | 46.7 °F | 3.26 in. |
| April | 38.5 °F | 59.7 °F | 4.24 in. |
| May | 50.0 °F | 70.3 °F | 4.42 in. |
| June | 59.6 °F | 78.9 °F | 4.91 in. |
| July | 62.2 °F | 82.1 °F | 4.59 in. |
| August | 60.9 °F | 80.7 °F | 3.81 in. |
| September | 54.0 °F | 75.3 °F | 3.3 in. |
| October | 42.3 °F | 62.9 °F | 2.89 in. |
| November | 31.8 °F | 49.1 °F | 3.17 in. |
| December | 23.4 °F | 37.7 °F | 3.12 in. |
| Annual | 40.7 °F | 59.4 °F | 43.15 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |