Placentia, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 54.1 °F (low) to 76.6 °F (high). Annual precipitation averages 13.2 Inches. Placentia is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 45.8 °F | 68.5 °F | 2.96 in. |
| February | 46.8 °F | 68.5 °F | 3.27 in. |
| March | 49.2 °F | 70.3 °F | 1.97 in. |
| April | 51.3 °F | 74.4 °F | 0.67 in. |
| May | 55.8 °F | 76.0 °F | 0.31 in. |
| June | 59.5 °F | 79.8 °F | 0.08 in. |
| July | 62.9 °F | 85.0 °F | 0.05 in. |
| August | 63.6 °F | 87.1 °F | 0.0 in. |
| September | 61.8 °F | 86.2 °F | 0.13 in. |
| October | 56.8 °F | 81.5 °F | 0.57 in. |
| November | 50.0 °F | 74.0 °F | 0.8 in. |
| December | 45.1 °F | 67.9 °F | 2.42 in. |
| Annual | 54.1 °F | 76.6 °F | 13.23 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 35°F to 30°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |