Alpine, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 49.2 °F (low) to 76.3 °F (high). Annual precipitation averages 16.8 Inches. Alpine is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.5 °F | 65.4 °F | 3.01 in. |
| February | 41.7 °F | 65.0 °F | 3.94 in. |
| March | 43.0 °F | 67.8 °F | 2.99 in. |
| April | 44.9 °F | 71.5 °F | 1.23 in. |
| May | 48.8 °F | 75.6 °F | 0.49 in. |
| June | 53.3 °F | 83.6 °F | 0.08 in. |
| July | 59.5 °F | 89.2 °F | 0.13 in. |
| August | 61.1 °F | 91.5 °F | 0.13 in. |
| September | 58.4 °F | 88.7 °F | 0.25 in. |
| October | 52.2 °F | 80.5 °F | 0.67 in. |
| November | 45.2 °F | 72.2 °F | 1.5 in. |
| December | 40.5 °F | 64.8 °F | 2.39 in. |
| Annual | 49.2 °F | 76.3 °F | 16.81 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |