Somerville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.9 °F (low) to 66.5 °F (high). Annual precipitation averages 49.5 Inches. Somerville is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 23.7 °F | 40.5 °F | 3.58 in. |
| February | 26.3 °F | 45.3 °F | 3.08 in. |
| March | 34.7 °F | 55.4 °F | 4.35 in. |
| April | 45.2 °F | 67.6 °F | 5.34 in. |
| May | 55.6 °F | 76.9 °F | 5.48 in. |
| June | 64.3 °F | 85.0 °F | 4.82 in. |
| July | 67.5 °F | 88.0 °F | 4.36 in. |
| August | 65.5 °F | 87.2 °F | 3.09 in. |
| September | 57.8 °F | 81.4 °F | 3.78 in. |
| October | 46.1 °F | 69.8 °F | 3.56 in. |
| November | 35.8 °F | 55.7 °F | 4.13 in. |
| December | 27.9 °F | 44.8 °F | 3.88 in. |
| Annual | 45.9 °F | 66.5 °F | 49.45 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |