Irvine, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 54.7 °F (low) to 73.7 °F (high). Annual precipitation averages 12.1 Inches. Irvine is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.4 °F | 67.2 °F | 2.58 in. |
| February | 47.6 °F | 67.1 °F | 3.13 in. |
| March | 50.0 °F | 68.2 °F | 1.77 in. |
| April | 52.2 °F | 71.4 °F | 0.72 in. |
| May | 56.6 °F | 73.2 °F | 0.27 in. |
| June | 60.2 °F | 75.6 °F | 0.09 in. |
| July | 63.4 °F | 80.5 °F | 0.07 in. |
| August | 64.0 °F | 82.5 °F | 0.01 in. |
| September | 62.3 °F | 81.9 °F | 0.12 in. |
| October | 57.5 °F | 78.0 °F | 0.42 in. |
| November | 50.6 °F | 72.1 °F | 0.82 in. |
| December | 45.9 °F | 67.0 °F | 2.12 in. |
| Annual | 54.7 °F | 73.7 °F | 12.12 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 | BSk - Cold Semi-Arid Climate |