Granville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.2 °F (low) to 61.3 °F (high). Annual precipitation averages 41.9 Inches. Granville 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 | 19.4 °F | 35.7 °F | 3.16 in. |
| February | 21.2 °F | 38.9 °F | 2.46 in. |
| March | 29.2 °F | 49.0 °F | 3.51 in. |
| April | 39.7 °F | 62.1 °F | 3.97 in. |
| May | 50.2 °F | 72.0 °F | 4.14 in. |
| June | 59.4 °F | 80.3 °F | 4.34 in. |
| July | 62.6 °F | 83.4 °F | 4.34 in. |
| August | 60.7 °F | 82.1 °F | 3.68 in. |
| September | 53.3 °F | 76.4 °F | 3.27 in. |
| October | 41.7 °F | 64.3 °F | 2.9 in. |
| November | 32.2 °F | 51.2 °F | 3.01 in. |
| December | 24.9 °F | 40.2 °F | 3.11 in. |
| Annual | 41.2 °F | 61.3 °F | 41.89 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 |