Santa Ana, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 12.6 °C (low) to 23.9 °C (high). Annual precipitation averages 324.3 Millimeters. Santa Ana is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.1 °C | 19.8 °C | 74.42 mm |
| February | 8.6 °C | 19.7 °C | 82.04 mm |
| March | 10 °C | 20.4 °C | 46.48 mm |
| April | 11.2 °C | 22.7 °C | 16.76 mm |
| May | 13.6 °C | 23.7 °C | 7.37 mm |
| June | 15.6 °C | 25.3 °C | 2.03 mm |
| July | 17.4 °C | 27.9 °C | 1.27 mm |
| August | 17.8 °C | 29.2 °C | 0.25 mm |
| September | 16.9 °C | 28.9 °C | 3.05 mm |
| October | 14.2 °C | 26.6 °C | 13.46 mm |
| November | 10.4 °C | 22.6 °C | 19.81 mm |
| December | 7.7 °C | 19.6 °C | 57.4 mm |
| Annual | 12.6 °C | 23.9 °C | 324.34 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 10b : 1.7°C to 4.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |