Ballantine, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.3 °F (low) to 61.6 °F (high). Annual precipitation averages 15 Inches. Ballantine is located in USDA Plant Hardiness Zone 4b. 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 | 12.8 °F | 36.6 °F | 0.48 in. |
| February | 15.4 °F | 40.7 °F | 0.53 in. |
| March | 23.4 °F | 51.3 °F | 0.88 in. |
| April | 32.5 °F | 60.0 °F | 1.81 in. |
| May | 42.0 °F | 69.6 °F | 2.54 in. |
| June | 50.5 °F | 79.0 °F | 2.34 in. |
| July | 56.1 °F | 88.9 °F | 1.34 in. |
| August | 53.7 °F | 87.9 °F | 0.96 in. |
| September | 44.4 °F | 77.1 °F | 1.48 in. |
| October | 32.7 °F | 62.0 °F | 1.45 in. |
| November | 22.3 °F | 48.2 °F | 0.67 in. |
| December | 14.1 °F | 37.9 °F | 0.51 in. |
| Annual | 33.3 °F | 61.6 °F | 14.99 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |