West Glacier, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.1 °F (low) to 54 °F (high). Annual precipitation averages 32.1 Inches. West Glacier is located in USDA Plant Hardiness Zone 5a. 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 | 16.7 °F | 30.8 °F | 3.66 in. |
| February | 17.2 °F | 35.1 °F | 2.37 in. |
| March | 23.3 °F | 43.5 °F | 2.73 in. |
| April | 29.6 °F | 53.0 °F | 2.22 in. |
| May | 37.0 °F | 63.6 °F | 2.66 in. |
| June | 43.4 °F | 70.0 °F | 3.83 in. |
| July | 47.6 °F | 80.6 °F | 1.41 in. |
| August | 45.9 °F | 80.3 °F | 1.18 in. |
| September | 38.9 °F | 68.8 °F | 1.99 in. |
| October | 30.8 °F | 53.0 °F | 3.23 in. |
| November | 24.5 °F | 38.7 °F | 3.45 in. |
| December | 18.4 °F | 30.5 °F | 3.39 in. |
| Annual | 31.1 °F | 54 °F | 32.12 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |