Valier, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.7 °F (low) to 55.6 °F (high). Annual precipitation averages 12.5 Inches. Valier 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.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.3 °F | 34.1 °F | 0.23 in. |
| February | 13.4 °F | 35.5 °F | 0.3 in. |
| March | 20.4 °F | 43.4 °F | 0.4 in. |
| April | 29.0 °F | 53.7 °F | 1.27 in. |
| May | 38.2 °F | 63.4 °F | 2.17 in. |
| June | 45.6 °F | 71.0 °F | 3.23 in. |
| July | 50.9 °F | 80.7 °F | 1.15 in. |
| August | 49.4 °F | 80.6 °F | 1.05 in. |
| September | 41.8 °F | 70.6 °F | 1.18 in. |
| October | 31.6 °F | 56.6 °F | 0.8 in. |
| November | 21.9 °F | 43.0 °F | 0.43 in. |
| December | 14.0 °F | 34.1 °F | 0.25 in. |
| Annual | 30.7 °F | 55.6 °F | 12.46 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 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 | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |