Lennox, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 56.3 °F (low) to 71.1 °F (high). Annual precipitation averages 13.6 Inches. Lennox is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 49.2 °F | 66.1 °F | 3.2 in. |
| February | 49.9 °F | 65.7 °F | 3.56 in. |
| March | 51.9 °F | 66.3 °F | 2.15 in. |
| April | 53.8 °F | 68.9 °F | 0.63 in. |
| May | 57.3 °F | 70.3 °F | 0.27 in. |
| June | 60.6 °F | 72.7 °F | 0.06 in. |
| July | 63.6 °F | 76.1 °F | 0.03 in. |
| August | 64.2 °F | 77.5 °F | 0.02 in. |
| September | 63.2 °F | 77.4 °F | 0.13 in. |
| October | 59.4 °F | 75.1 °F | 0.58 in. |
| November | 53.3 °F | 70.6 °F | 0.7 in. |
| December | 48.8 °F | 65.9 °F | 2.26 in. |
| Annual | 56.3 °F | 71.1 °F | 13.59 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 10b : 35°F to 30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |