Alzada, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.1 °C (low) to 14.7 °C (high). Annual precipitation averages 414.5 Millimeters. 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 | -12.2 °C | 0.7 °C | 9.91 mm |
| February | -10.7 °C | 2.2 °C | 12.45 mm |
| March | -5.9 °C | 7.9 °C | 22.1 mm |
| April | -0.9 °C | 13.3 °C | 44.7 mm |
| May | 4.7 °C | 18.6 °C | 71.63 mm |
| June | 10.1 °C | 24.9 °C | 71.12 mm |
| July | 13.7 °C | 30.1 °C | 53.09 mm |
| August | 12.7 °C | 29.8 °C | 38.86 mm |
| September | 6.9 °C | 24 °C | 30.23 mm |
| October | 0 °C | 15.3 °C | 35.56 mm |
| November | -6.2 °C | 7.4 °C | 13.21 mm |
| December | -11.1 °C | 1.7 °C | 11.68 mm |
| Annual | 0.1 °C | 14.7 °C | 414.54 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |