Augusta, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.6 °C (low) to 14 °C (high). Annual precipitation averages 351.3 Millimeters. 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 | -9.5 °C | 2.6 °C | 10.92 mm |
| February | -9.2 °C | 3.8 °C | 13.97 mm |
| March | -5.7 °C | 7.9 °C | 17.02 mm |
| April | -1.6 °C | 12.7 °C | 36.07 mm |
| May | 2.8 °C | 17.7 °C | 63.25 mm |
| June | 6.8 °C | 21.9 °C | 73.66 mm |
| July | 9.7 °C | 28.1 °C | 27.94 mm |
| August | 8.7 °C | 27.7 °C | 29.21 mm |
| September | 4.7 °C | 22.3 °C | 31.5 mm |
| October | 0.2 °C | 14.6 °C | 21.08 mm |
| November | -4.9 °C | 6.8 °C | 14.99 mm |
| December | -9 °C | 2.4 °C | 11.68 mm |
| Annual | -0.6 °C | 14 °C | 351.29 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |