Alpine, Arizona has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 16.6 °C (high). Annual precipitation averages 510 Millimeters. Alpine is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.6 °C | 7.6 °C | 31.75 mm |
| February | -7.2 °C | 8.6 °C | 27.43 mm |
| March | -4.9 °C | 11.7 °C | 24.38 mm |
| April | -2.6 °C | 15.4 °C | 13.21 mm |
| May | 1.1 °C | 20.1 °C | 17.53 mm |
| June | 5.8 °C | 25.7 °C | 19.81 mm |
| July | 9.2 °C | 25.9 °C | 90.68 mm |
| August | 8.8 °C | 24.4 °C | 111.51 mm |
| September | 5.4 °C | 22.3 °C | 59.18 mm |
| October | -0.2 °C | 17.7 °C | 42.93 mm |
| November | -4.7 °C | 12.2 °C | 31.24 mm |
| December | -8.4 °C | 7.8 °C | 40.39 mm |
| Annual | -0.5 °C | 16.6 °C | 510.04 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |