Alzada, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 32.2 °F (low) to 58.4 °F (high). Annual precipitation averages 16.3 Inches. Alzada is located in USDA Plant Hardiness Zone 4b. 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 | 10.1 °F | 33.3 °F | 0.39 in. |
| February | 12.8 °F | 35.9 °F | 0.49 in. |
| March | 21.3 °F | 46.3 °F | 0.87 in. |
| April | 30.3 °F | 56.0 °F | 1.76 in. |
| May | 40.4 °F | 65.5 °F | 2.82 in. |
| June | 50.2 °F | 76.8 °F | 2.8 in. |
| July | 56.7 °F | 86.2 °F | 2.09 in. |
| August | 54.8 °F | 85.6 °F | 1.53 in. |
| September | 44.5 °F | 75.2 °F | 1.19 in. |
| October | 32.0 °F | 59.6 °F | 1.4 in. |
| November | 20.9 °F | 45.4 °F | 0.52 in. |
| December | 12.1 °F | 35.1 °F | 0.46 in. |
| Annual | 32.2 °F | 58.4 °F | 16.32 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |