Brady, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 31.2 °F (low) to 56.8 °F (high). Annual precipitation averages 12.1 Inches. Brady is located in USDA Plant Hardiness Zone 4a. 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 | 12.5 °F | 34.2 °F | 0.36 in. |
| February | 13.6 °F | 36.7 °F | 0.37 in. |
| March | 20.9 °F | 45.0 °F | 0.49 in. |
| April | 29.6 °F | 55.0 °F | 1.32 in. |
| May | 38.8 °F | 64.6 °F | 2.01 in. |
| June | 46.4 °F | 72.3 °F | 2.72 in. |
| July | 51.7 °F | 82.7 °F | 1.05 in. |
| August | 50.1 °F | 82.1 °F | 1.02 in. |
| September | 42.3 °F | 71.5 °F | 1.15 in. |
| October | 31.9 °F | 57.7 °F | 0.75 in. |
| November | 22.1 °F | 44.1 °F | 0.51 in. |
| December | 14.0 °F | 35.1 °F | 0.37 in. |
| Annual | 31.2 °F | 56.8 °F | 12.12 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |