West Yellowstone, Montana has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -6.2 °C (low) to 10 °C (high). Annual precipitation averages 616.2 Millimeters. 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 | -16.2 °C | -3.6 °C | 63.75 mm |
| February | -15.7 °C | -1.1 °C | 54.61 mm |
| March | -11.5 °C | 4.1 °C | 54.36 mm |
| April | -6.4 °C | 8.4 °C | 56.64 mm |
| May | -1.6 °C | 14.4 °C | 63.5 mm |
| June | 1.7 °C | 19.7 °C | 57.15 mm |
| July | 4.2 °C | 25.8 °C | 33.53 mm |
| August | 2.9 °C | 25.4 °C | 26.16 mm |
| September | -0.7 °C | 19.3 °C | 33.27 mm |
| October | -4.9 °C | 10.3 °C | 43.69 mm |
| November | -10.7 °C | 1.6 °C | 58.93 mm |
| December | -15.9 °C | -4.2 °C | 70.61 mm |
| Annual | -6.2 °C | 10 °C | 616.2 mm |
| 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 : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |