Bainville, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30 °F (low) to 55.5 °F (high). Annual precipitation averages 14.9 Inches. Bainville is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.7 °F | 23.4 °F | 0.36 in. |
| February | 7.1 °F | 28.6 °F | 0.28 in. |
| March | 18.1 °F | 41.1 °F | 0.53 in. |
| April | 30.0 °F | 56.9 °F | 0.99 in. |
| May | 40.7 °F | 68.4 °F | 2.26 in. |
| June | 50.7 °F | 77.0 °F | 2.96 in. |
| July | 56.0 °F | 85.2 °F | 2.59 in. |
| August | 53.7 °F | 85.0 °F | 1.6 in. |
| September | 43.7 °F | 74.4 °F | 1.42 in. |
| October | 31.6 °F | 58.0 °F | 0.9 in. |
| November | 18.3 °F | 40.1 °F | 0.54 in. |
| December | 7.6 °F | 27.7 °F | 0.42 in. |
| Annual | 30 °F | 55.5 °F | 14.85 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |