Piru, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 50.7 °F (low) to 76 °F (high). Annual precipitation averages 18.3 Inches. Piru is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 45.0 °F | 65.9 °F | 4.44 in. |
| February | 44.6 °F | 66.3 °F | 4.86 in. |
| March | 46.0 °F | 69.1 °F | 2.92 in. |
| April | 47.3 °F | 72.4 °F | 0.79 in. |
| May | 50.8 °F | 75.6 °F | 0.47 in. |
| June | 53.9 °F | 80.6 °F | 0.04 in. |
| July | 58.3 °F | 86.9 °F | 0.06 in. |
| August | 58.7 °F | 89.4 °F | 0.01 in. |
| September | 57.3 °F | 87.3 °F | 0.12 in. |
| October | 53.6 °F | 80.7 °F | 0.69 in. |
| November | 48.5 °F | 72.8 °F | 1.04 in. |
| December | 44.2 °F | 65.4 °F | 2.82 in. |
| Annual | 50.7 °F | 76 °F | 18.26 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |