Boronda, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 47.9 °F (low) to 65.4 °F (high). Annual precipitation averages 16.6 Inches. Boronda is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.0 °F | 60.5 °F | 3.24 in. |
| February | 43.2 °F | 61.3 °F | 3.14 in. |
| March | 44.5 °F | 62.6 °F | 2.44 in. |
| April | 45.8 °F | 64.0 °F | 1.26 in. |
| May | 49.1 °F | 65.6 °F | 0.42 in. |
| June | 51.7 °F | 67.2 °F | 0.09 in. |
| July | 54.3 °F | 67.8 °F | 0.03 in. |
| August | 54.8 °F | 69.2 °F | 0.04 in. |
| September | 53.4 °F | 70.9 °F | 0.06 in. |
| October | 49.4 °F | 70.6 °F | 0.8 in. |
| November | 44.8 °F | 65.2 °F | 1.78 in. |
| December | 41.5 °F | 60.4 °F | 3.25 in. |
| Annual | 47.9 °F | 65.4 °F | 16.55 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |