Phillipsville, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.5 °C (low) to 21.1 °C (high). Annual precipitation averages 1373.6 Millimeters. Phillipsville is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.4 °C | 12.5 °C | 278.89 mm |
| February | 3.6 °C | 14.1 °C | 205.23 mm |
| March | 4.2 °C | 15.9 °C | 205.99 mm |
| April | 5.1 °C | 18.9 °C | 105.92 mm |
| May | 7.3 °C | 22.4 °C | 51.05 mm |
| June | 9.3 °C | 25.8 °C | 17.53 mm |
| July | 11.2 °C | 31.3 °C | 2.03 mm |
| August | 10.9 °C | 31.4 °C | 2.54 mm |
| September | 8.9 °C | 29.8 °C | 11.94 mm |
| October | 6.6 °C | 24.3 °C | 70.36 mm |
| November | 4.8 °C | 15.5 °C | 156.97 mm |
| December | 3.1 °C | 11.7 °C | 265.18 mm |
| Annual | 6.5 °C | 21.1 °C | 1373.63 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°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 |