Alderpoint, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44 °F (low) to 71.3 °F (high). Annual precipitation averages 51 Inches. Alderpoint is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.1 °F | 54.8 °F | 10.49 in. |
| February | 38.6 °F | 57.9 °F | 7.79 in. |
| March | 39.8 °F | 61.3 °F | 6.89 in. |
| April | 41.4 °F | 68.0 °F | 3.72 in. |
| May | 45.5 °F | 74.3 °F | 1.99 in. |
| June | 49.2 °F | 81.8 °F | 0.58 in. |
| July | 52.6 °F | 90.0 °F | 0.06 in. |
| August | 52.1 °F | 89.8 °F | 0.14 in. |
| September | 48.4 °F | 87.6 °F | 0.37 in. |
| October | 44.1 °F | 75.9 °F | 2.75 in. |
| November | 40.9 °F | 60.4 °F | 5.54 in. |
| December | 37.6 °F | 53.2 °F | 10.72 in. |
| Annual | 44 °F | 71.3 °F | 51.04 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 10-20 Days |
| 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 |