Alpine, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.1 °F (low) to 63.3 °F (high). Annual precipitation averages 47 Inches. 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 | 34.8 °F | 47.2 °F | 7.1 in. |
| February | 35.0 °F | 51.1 °F | 5.66 in. |
| March | 36.9 °F | 55.8 °F | 6.45 in. |
| April | 39.6 °F | 60.4 °F | 3.52 in. |
| May | 44.3 °F | 67.1 °F | 2.15 in. |
| June | 48.3 °F | 73.4 °F | 1.21 in. |
| July | 51.8 °F | 82.0 °F | 0.27 in. |
| August | 51.7 °F | 82.8 °F | 0.37 in. |
| September | 48.1 °F | 77.0 °F | 1.24 in. |
| October | 42.4 °F | 64.2 °F | 3.43 in. |
| November | 37.9 °F | 52.8 °F | 6.32 in. |
| December | 34.4 °F | 46.2 °F | 9.3 in. |
| Annual | 42.1 °F | 63.3 °F | 47.02 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |