Clipper Mills, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.2 °C (low) to 19.5 °C (high). Annual precipitation averages 1975.4 Millimeters. Clipper Mills is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.6 °C | 11.2 °C | 358.65 mm |
| February | 1.6 °C | 11.7 °C | 338.33 mm |
| March | 2.6 °C | 13.6 °C | 283.72 mm |
| April | 4.1 °C | 16.1 °C | 155.7 mm |
| May | 7.9 °C | 20.7 °C | 96.27 mm |
| June | 11.9 °C | 25.9 °C | 29.46 mm |
| July | 15.6 °C | 30.5 °C | 2.79 mm |
| August | 15.1 °C | 30.4 °C | 4.57 mm |
| September | 12.6 °C | 27.8 °C | 12.95 mm |
| October | 8.2 °C | 21.7 °C | 104.14 mm |
| November | 3.8 °C | 14.5 °C | 201.42 mm |
| December | 1.3 °C | 10.2 °C | 387.35 mm |
| Annual | 7.2 °C | 19.5 °C | 1975.35 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |