Norwalk, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 55.3 °F (low) to 75.3 °F (high). Annual precipitation averages 13.6 Inches. Norwalk is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.7 °F | 67.9 °F | 3.3 in. |
| February | 48.1 °F | 67.7 °F | 3.68 in. |
| March | 50.7 °F | 69.1 °F | 2.03 in. |
| April | 52.9 °F | 72.6 °F | 0.67 in. |
| May | 57.1 °F | 74.6 °F | 0.27 in. |
| June | 60.6 °F | 78.2 °F | 0.07 in. |
| July | 63.9 °F | 83.3 °F | 0.04 in. |
| August | 64.5 °F | 85.1 °F | 0.01 in. |
| September | 63.0 °F | 84.3 °F | 0.13 in. |
| October | 58.2 °F | 79.8 °F | 0.52 in. |
| November | 51.2 °F | 73.0 °F | 0.71 in. |
| December | 46.2 °F | 67.4 °F | 2.17 in. |
| Annual | 55.3 °F | 75.3 °F | 13.6 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 | Csa - Hot-Summer Mediterranean Climate |