Alpine, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 23.9 °F (low) to 56.2 °F (high). Annual precipitation averages 13.6 Inches. Alpine is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °F | 33.5 °F | 0.59 in. |
| February | 6.2 °F | 37.7 °F | 0.98 in. |
| March | 16.0 °F | 47.2 °F | 1.15 in. |
| April | 23.5 °F | 54.5 °F | 0.82 in. |
| May | 31.8 °F | 63.6 °F | 1.14 in. |
| June | 38.7 °F | 74.3 °F | 0.81 in. |
| July | 44.9 °F | 77.6 °F | 1.93 in. |
| August | 43.9 °F | 75.6 °F | 2.06 in. |
| September | 36.4 °F | 70.2 °F | 1.57 in. |
| October | 26.1 °F | 59.4 °F | 1.07 in. |
| November | 14.3 °F | 46.1 °F | 0.63 in. |
| December | 3.4 °F | 34.1 °F | 0.8 in. |
| Annual | 23.9 °F | 56.2 °F | 13.55 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 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 | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |