West Yellowstone, Montana has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 20.8 °F (low) to 50 °F (high). Annual precipitation averages 24.3 Inches. West Yellowstone is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 1 - Aug. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.9 °F | 25.5 °F | 2.51 in. |
| February | 3.7 °F | 30.0 °F | 2.15 in. |
| March | 11.3 °F | 39.3 °F | 2.14 in. |
| April | 20.5 °F | 47.2 °F | 2.23 in. |
| May | 29.1 °F | 58.0 °F | 2.5 in. |
| June | 35.1 °F | 67.4 °F | 2.25 in. |
| July | 39.5 °F | 78.5 °F | 1.32 in. |
| August | 37.3 °F | 77.8 °F | 1.03 in. |
| September | 30.7 °F | 66.8 °F | 1.31 in. |
| October | 23.1 °F | 50.6 °F | 1.72 in. |
| November | 12.7 °F | 34.8 °F | 2.32 in. |
| December | 3.4 °F | 24.5 °F | 2.78 in. |
| Annual | 20.8 °F | 50 °F | 24.26 in. |
| Average First Frost Date | Aug. 1 - Aug. 10 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |