Placentia, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 12.3 °C (low) to 24.8 °C (high). Annual precipitation averages 336 Millimeters. Placentia is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.7 °C | 20.3 °C | 75.18 mm |
| February | 8.2 °C | 20.3 °C | 83.06 mm |
| March | 9.6 °C | 21.3 °C | 50.04 mm |
| April | 10.7 °C | 23.6 °C | 17.02 mm |
| May | 13.2 °C | 24.4 °C | 7.87 mm |
| June | 15.3 °C | 26.6 °C | 2.03 mm |
| July | 17.2 °C | 29.4 °C | 1.27 mm |
| August | 17.6 °C | 30.6 °C | 0 mm |
| September | 16.6 °C | 30.1 °C | 3.3 mm |
| October | 13.8 °C | 27.5 °C | 14.48 mm |
| November | 10 °C | 23.3 °C | 20.32 mm |
| December | 7.3 °C | 19.9 °C | 61.47 mm |
| Annual | 12.3 °C | 24.8 °C | 336.04 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10a : -1.1°C to 1.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |