Busby, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.7 °F (low) to 60.3 °F (high). Annual precipitation averages 15.8 Inches. Busby is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.8 °F | 35.5 °F | 0.69 in. |
| February | 12.7 °F | 38.3 °F | 0.7 in. |
| March | 21.5 °F | 49.1 °F | 0.96 in. |
| April | 29.9 °F | 58.4 °F | 1.69 in. |
| May | 38.9 °F | 67.5 °F | 2.74 in. |
| June | 47.6 °F | 77.8 °F | 2.14 in. |
| July | 53.4 °F | 88.2 °F | 1.43 in. |
| August | 51.0 °F | 87.7 °F | 0.99 in. |
| September | 42.0 °F | 76.7 °F | 1.57 in. |
| October | 30.8 °F | 61.0 °F | 1.51 in. |
| November | 19.9 °F | 47.0 °F | 0.71 in. |
| December | 11.1 °F | 36.5 °F | 0.66 in. |
| Annual | 30.7 °F | 60.3 °F | 15.79 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |