Valier, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.7 °C (low) to 13.1 °C (high). Annual precipitation averages 316.5 Millimeters. 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 | -10.9 °C | 1.2 °C | 5.84 mm |
| February | -10.3 °C | 1.9 °C | 7.62 mm |
| March | -6.4 °C | 6.3 °C | 10.16 mm |
| April | -1.7 °C | 12.1 °C | 32.26 mm |
| May | 3.4 °C | 17.4 °C | 55.12 mm |
| June | 7.6 °C | 21.7 °C | 82.04 mm |
| July | 10.5 °C | 27.1 °C | 29.21 mm |
| August | 9.7 °C | 27 °C | 26.67 mm |
| September | 5.4 °C | 21.4 °C | 29.97 mm |
| October | -0.2 °C | 13.7 °C | 20.32 mm |
| November | -5.6 °C | 6.1 °C | 10.92 mm |
| December | -10 °C | 1.2 °C | 6.35 mm |
| Annual | -0.7 °C | 13.1 °C | 316.48 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |