Somers, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.2 °F (low) to 55.8 °F (high). Annual precipitation averages 16 Inches. Somers is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.7 °F | 32.1 °F | 1.24 in. |
| February | 19.6 °F | 36.0 °F | 0.88 in. |
| March | 25.4 °F | 45.1 °F | 1.05 in. |
| April | 31.8 °F | 55.1 °F | 1.35 in. |
| May | 39.5 °F | 65.3 °F | 1.79 in. |
| June | 45.9 °F | 71.4 °F | 2.61 in. |
| July | 50.1 °F | 82.4 °F | 1.14 in. |
| August | 48.3 °F | 82.2 °F | 0.89 in. |
| September | 41.1 °F | 71.1 °F | 1.18 in. |
| October | 32.4 °F | 55.4 °F | 1.36 in. |
| November | 26.1 °F | 40.8 °F | 1.26 in. |
| December | 19.9 °F | 32.1 °F | 1.24 in. |
| Annual | 33.2 °F | 55.8 °F | 15.99 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |