Bainville, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.1 °C (low) to 13 °C (high). Annual precipitation averages 377.2 Millimeters. 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 | -16.3 °C | -4.8 °C | 9.14 mm |
| February | -13.8 °C | -1.9 °C | 7.11 mm |
| March | -7.7 °C | 5.1 °C | 13.46 mm |
| April | -1.1 °C | 13.8 °C | 25.15 mm |
| May | 4.8 °C | 20.2 °C | 57.4 mm |
| June | 10.4 °C | 25 °C | 75.18 mm |
| July | 13.3 °C | 29.6 °C | 65.79 mm |
| August | 12.1 °C | 29.4 °C | 40.64 mm |
| September | 6.5 °C | 23.6 °C | 36.07 mm |
| October | -0.2 °C | 14.4 °C | 22.86 mm |
| November | -7.6 °C | 4.5 °C | 13.72 mm |
| December | -13.6 °C | -2.4 °C | 10.67 mm |
| Annual | -1.1 °C | 13 °C | 377.19 mm |
| 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 : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |