Alpine, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.6 °C (low) to 17.4 °C (high). Annual precipitation averages 1194.3 Millimeters. Alpine is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.6 °C | 8.4 °C | 180.34 mm |
| February | 1.7 °C | 10.6 °C | 143.76 mm |
| March | 2.7 °C | 13.2 °C | 163.83 mm |
| April | 4.2 °C | 15.8 °C | 89.41 mm |
| May | 6.8 °C | 19.5 °C | 54.61 mm |
| June | 9.1 °C | 23 °C | 30.73 mm |
| July | 11 °C | 27.8 °C | 6.86 mm |
| August | 10.9 °C | 28.2 °C | 9.4 mm |
| September | 8.9 °C | 25 °C | 31.5 mm |
| October | 5.8 °C | 17.9 °C | 87.12 mm |
| November | 3.3 °C | 11.6 °C | 160.53 mm |
| December | 1.3 °C | 7.9 °C | 236.22 mm |
| Annual | 5.6 °C | 17.4 °C | 1194.31 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |