Mendocino, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8.3 °C (low) to 16.3 °C (high). Annual precipitation averages 1060 Millimeters. Mendocino is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.7 °C | 13.3 °C | 190.5 mm |
| February | 6.6 °C | 13.4 °C | 165.1 mm |
| March | 6.5 °C | 14.1 °C | 154.43 mm |
| April | 7.1 °C | 15.4 °C | 80.52 mm |
| May | 8.4 °C | 16.6 °C | 54.36 mm |
| June | 9.7 °C | 18.1 °C | 17.27 mm |
| July | 10.1 °C | 18.7 °C | 2.29 mm |
| August | 10.6 °C | 19.2 °C | 6.35 mm |
| September | 10.2 °C | 19.5 °C | 6.86 mm |
| October | 9.2 °C | 18.2 °C | 56.39 mm |
| November | 7.7 °C | 15.1 °C | 116.84 mm |
| December | 6.3 °C | 13.8 °C | 209.04 mm |
| Annual | 8.3 °C | 16.3 °C | 1059.95 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |