Signal Hill, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 55.7 °F (low) to 72.9 °F (high). Annual precipitation averages 12.2 Inches. Signal Hill is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 47.6 °F | 67.2 °F | 2.85 in. |
| February | 48.7 °F | 67.0 °F | 3.19 in. |
| March | 51.1 °F | 68.1 °F | 1.79 in. |
| April | 53.2 °F | 70.3 °F | 0.58 in. |
| May | 57.2 °F | 71.8 °F | 0.22 in. |
| June | 60.7 °F | 74.5 °F | 0.09 in. |
| July | 63.9 °F | 78.7 °F | 0.04 in. |
| August | 64.5 °F | 80.7 °F | 0.01 in. |
| September | 63.2 °F | 80.3 °F | 0.1 in. |
| October | 58.7 °F | 76.7 °F | 0.43 in. |
| November | 52.1 °F | 72.2 °F | 0.79 in. |
| December | 47.1 °F | 66.9 °F | 2.06 in. |
| Annual | 55.7 °F | 72.9 °F | 12.15 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 |