Alpine, Wyoming has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.2 °C (low) to 12.5 °C (high). Annual precipitation averages 602.5 Millimeters. Alpine is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.5 °C | -1.9 °C | 101.09 mm |
| February | -11.7 °C | 0.1 °C | 61.47 mm |
| March | -7.3 °C | 5.3 °C | 39.88 mm |
| April | -2.3 °C | 10.8 °C | 55.37 mm |
| May | 2.1 °C | 17.1 °C | 57.91 mm |
| June | 5.2 °C | 22.5 °C | 42.67 mm |
| July | 8.2 °C | 28.6 °C | 23.11 mm |
| August | 7.6 °C | 27.9 °C | 40.89 mm |
| September | 3 °C | 22.4 °C | 41.15 mm |
| October | -1.2 °C | 14.1 °C | 37.85 mm |
| November | -6.4 °C | 4.8 °C | 61.21 mm |
| December | -11.4 °C | -2 °C | 39.88 mm |
| Annual | -2.2 °C | 12.5 °C | 602.48 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |