Ballantine, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.8 °C (low) to 16.5 °C (high). Annual precipitation averages 380.7 Millimeters. 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 | -10.7 °C | 2.6 °C | 12.19 mm |
| February | -9.2 °C | 4.8 °C | 13.46 mm |
| March | -4.8 °C | 10.7 °C | 22.35 mm |
| April | 0.3 °C | 15.6 °C | 45.97 mm |
| May | 5.6 °C | 20.9 °C | 64.52 mm |
| June | 10.3 °C | 26.1 °C | 59.44 mm |
| July | 13.4 °C | 31.6 °C | 34.04 mm |
| August | 12.1 °C | 31.1 °C | 24.38 mm |
| September | 6.9 °C | 25.1 °C | 37.59 mm |
| October | 0.4 °C | 16.7 °C | 36.83 mm |
| November | -5.4 °C | 9 °C | 17.02 mm |
| December | -9.9 °C | 3.3 °C | 12.95 mm |
| Annual | 0.8 °C | 16.5 °C | 380.74 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |