Somerville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.7 °C (low) to 19.1 °C (high). Annual precipitation averages 1256 Millimeters. 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 | -4.6 °C | 4.7 °C | 90.93 mm |
| February | -3.2 °C | 7.4 °C | 78.23 mm |
| March | 1.5 °C | 13 °C | 110.49 mm |
| April | 7.3 °C | 19.8 °C | 135.64 mm |
| May | 13.1 °C | 24.9 °C | 139.19 mm |
| June | 17.9 °C | 29.4 °C | 122.43 mm |
| July | 19.7 °C | 31.1 °C | 110.74 mm |
| August | 18.6 °C | 30.7 °C | 78.49 mm |
| September | 14.3 °C | 27.4 °C | 96.01 mm |
| October | 7.8 °C | 21 °C | 90.42 mm |
| November | 2.1 °C | 13.2 °C | 104.9 mm |
| December | -2.3 °C | 7.1 °C | 98.55 mm |
| Annual | 7.7 °C | 19.1 °C | 1256.02 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |