Bolivar, Ohio has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.7 °F (low) to 61.3 °F (high). Annual precipitation averages 42.4 Inches. Bolivar is located in USDA Plant Hardiness Zone 6b. 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 | 19.6 °F | 35.4 °F | 3.05 in. |
| February | 20.8 °F | 38.4 °F | 2.39 in. |
| March | 28.4 °F | 48.2 °F | 3.26 in. |
| April | 38.5 °F | 62.0 °F | 3.69 in. |
| May | 49.2 °F | 72.2 °F | 4.16 in. |
| June | 58.0 °F | 80.4 °F | 4.98 in. |
| July | 61.9 °F | 83.8 °F | 4.49 in. |
| August | 60.0 °F | 82.7 °F | 3.89 in. |
| September | 52.7 °F | 76.6 °F | 3.3 in. |
| October | 41.6 °F | 64.4 °F | 3.31 in. |
| November | 32.3 °F | 51.3 °F | 2.93 in. |
| December | 25.3 °F | 40.3 °F | 2.97 in. |
| Annual | 40.7 °F | 61.3 °F | 42.42 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |