Prunedale, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 47.5 °F (low) to 66 °F (high). Annual precipitation averages 17.9 Inches. Prunedale is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 41.6 °F | 60.6 °F | 3.47 in. |
| February | 42.9 °F | 61.4 °F | 3.49 in. |
| March | 44.0 °F | 63.0 °F | 2.48 in. |
| April | 45.2 °F | 64.5 °F | 1.38 in. |
| May | 48.6 °F | 66.5 °F | 0.47 in. |
| June | 51.2 °F | 68.1 °F | 0.11 in. |
| July | 54.0 °F | 68.6 °F | 0.04 in. |
| August | 54.5 °F | 69.9 °F | 0.05 in. |
| September | 53.0 °F | 71.8 °F | 0.08 in. |
| October | 49.0 °F | 71.4 °F | 0.84 in. |
| November | 44.5 °F | 65.6 °F | 1.88 in. |
| December | 41.0 °F | 60.3 °F | 3.57 in. |
| Annual | 47.5 °F | 66 °F | 17.86 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |