Miles City, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.1 °F (low) to 60.2 °F (high). Annual precipitation averages 14.7 Inches. Miles City is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.6 °F | 31.7 °F | 0.49 in. |
| February | 12.3 °F | 36.4 °F | 0.48 in. |
| March | 22.3 °F | 48.5 °F | 0.85 in. |
| April | 32.7 °F | 59.6 °F | 1.44 in. |
| May | 42.8 °F | 69.5 °F | 2.68 in. |
| June | 52.3 °F | 79.8 °F | 2.53 in. |
| July | 58.3 °F | 89.8 °F | 1.78 in. |
| August | 56.0 °F | 88.4 °F | 1.01 in. |
| September | 45.8 °F | 77.4 °F | 1.19 in. |
| October | 33.6 °F | 61.2 °F | 1.16 in. |
| November | 21.2 °F | 46.1 °F | 0.55 in. |
| December | 11.3 °F | 34.3 °F | 0.5 in. |
| Annual | 33.1 °F | 60.2 °F | 14.66 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |