Somerville, Ohio has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43 °F (low) to 63.4 °F (high). Annual precipitation averages 42.6 Inches. Somerville 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 | 21.1 °F | 37.4 °F | 3.19 in. |
| February | 23.3 °F | 41.3 °F | 2.52 in. |
| March | 31.4 °F | 51.6 °F | 3.63 in. |
| April | 41.5 °F | 64.3 °F | 4.47 in. |
| May | 52.4 °F | 73.8 °F | 4.69 in. |
| June | 61.2 °F | 82.1 °F | 4.61 in. |
| July | 64.4 °F | 85.2 °F | 3.89 in. |
| August | 62.6 °F | 84.5 °F | 3.02 in. |
| September | 54.8 °F | 78.7 °F | 2.98 in. |
| October | 43.3 °F | 66.9 °F | 3.17 in. |
| November | 33.4 °F | 53.2 °F | 3.14 in. |
| December | 26.5 °F | 41.6 °F | 3.33 in. |
| Annual | 43 °F | 63.4 °F | 42.64 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |