Phillipsville, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.8 °F (low) to 70 °F (high). Annual precipitation averages 54.1 Inches. 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 | 38.1 °F | 54.5 °F | 10.98 in. |
| February | 38.4 °F | 57.4 °F | 8.08 in. |
| March | 39.5 °F | 60.7 °F | 8.11 in. |
| April | 41.2 °F | 66.0 °F | 4.17 in. |
| May | 45.2 °F | 72.3 °F | 2.01 in. |
| June | 48.8 °F | 78.4 °F | 0.69 in. |
| July | 52.1 °F | 88.3 °F | 0.08 in. |
| August | 51.7 °F | 88.5 °F | 0.1 in. |
| September | 48.1 °F | 85.6 °F | 0.47 in. |
| October | 43.8 °F | 75.7 °F | 2.77 in. |
| November | 40.7 °F | 59.9 °F | 6.18 in. |
| December | 37.5 °F | 53.0 °F | 10.44 in. |
| Annual | 43.8 °F | 70 °F | 54.08 in. |
| 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 : 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 |