Augusta, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 31 °F (low) to 57.3 °F (high). Annual precipitation averages 13.8 Inches. Augusta is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.9 °F | 36.6 °F | 0.43 in. |
| February | 15.5 °F | 38.9 °F | 0.55 in. |
| March | 21.8 °F | 46.2 °F | 0.67 in. |
| April | 29.2 °F | 54.9 °F | 1.42 in. |
| May | 37.1 °F | 63.8 °F | 2.49 in. |
| June | 44.2 °F | 71.4 °F | 2.9 in. |
| July | 49.4 °F | 82.5 °F | 1.1 in. |
| August | 47.7 °F | 81.8 °F | 1.15 in. |
| September | 40.5 °F | 72.2 °F | 1.24 in. |
| October | 32.3 °F | 58.2 °F | 0.83 in. |
| November | 23.2 °F | 44.3 °F | 0.59 in. |
| December | 15.8 °F | 36.3 °F | 0.46 in. |
| Annual | 31 °F | 57.3 °F | 13.83 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 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 | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |