Redstone, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -2.5 °C (low) to 12 °C (high). Annual precipitation averages 360.4 Millimeters. Redstone is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -17.9 °C | -5.6 °C | 9.4 mm |
| February | -15.2 °C | -2.9 °C | 6.1 mm |
| March | -8.9 °C | 3.7 °C | 14.99 mm |
| April | -2.6 °C | 13.1 °C | 24.89 mm |
| May | 3.6 °C | 19.4 °C | 53.34 mm |
| June | 9.3 °C | 24 °C | 80.01 mm |
| July | 11.8 °C | 28.1 °C | 62.74 mm |
| August | 10.6 °C | 28.4 °C | 37.34 mm |
| September | 4.9 °C | 22.3 °C | 28.45 mm |
| October | -1.8 °C | 13.2 °C | 22.1 mm |
| November | -8.8 °C | 3.4 °C | 11.94 mm |
| December | -15 °C | -3.2 °C | 9.14 mm |
| Annual | -2.5 °C | 12 °C | 360.44 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°C to -37.2°C |
| Plant Hardiness Zone - 2012 | Zone 3a : -40°C to -37.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |