Musselshell, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.5 °F (low) to 60.7 °F (high). Annual precipitation averages 14.8 Inches. Musselshell 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 | 12.7 °F | 35.8 °F | 0.45 in. |
| February | 15.3 °F | 39.2 °F | 0.45 in. |
| March | 23.5 °F | 49.5 °F | 0.74 in. |
| April | 32.2 °F | 59.3 °F | 1.59 in. |
| May | 41.6 °F | 68.4 °F | 2.55 in. |
| June | 50.3 °F | 77.9 °F | 2.85 in. |
| July | 56.3 °F | 88.4 °F | 1.64 in. |
| August | 54.2 °F | 87.6 °F | 1.13 in. |
| September | 44.7 °F | 76.5 °F | 1.16 in. |
| October | 33.6 °F | 61.4 °F | 1.22 in. |
| November | 22.8 °F | 47.2 °F | 0.53 in. |
| December | 14.2 °F | 37.0 °F | 0.5 in. |
| Annual | 33.5 °F | 60.7 °F | 14.81 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 4a : -30°F to -25°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |