West Havre, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.7 °F (low) to 56.4 °F (high). Annual precipitation averages 12.3 Inches. West Havre 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.3 °F | 28.3 °F | 0.43 in. |
| February | 10.0 °F | 32.4 °F | 0.34 in. |
| March | 19.7 °F | 43.5 °F | 0.49 in. |
| April | 30.6 °F | 56.7 °F | 1.16 in. |
| May | 40.4 °F | 66.5 °F | 1.81 in. |
| June | 49.0 °F | 74.9 °F | 2.64 in. |
| July | 54.4 °F | 85.1 °F | 1.58 in. |
| August | 52.4 °F | 84.4 °F | 0.94 in. |
| September | 42.9 °F | 73.1 °F | 1.09 in. |
| October | 31.1 °F | 57.8 °F | 0.8 in. |
| November | 20.1 °F | 42.2 °F | 0.61 in. |
| December | 10.6 °F | 32.1 °F | 0.38 in. |
| Annual | 30.7 °F | 56.4 °F | 12.27 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 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 | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |