Signal Hill, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 13.2 °C (low) to 22.7 °C (high). Annual precipitation averages 308.6 Millimeters. Signal Hill is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.7 °C | 19.6 °C | 72.39 mm |
| February | 9.3 °C | 19.4 °C | 81.03 mm |
| March | 10.6 °C | 20.1 °C | 45.47 mm |
| April | 11.8 °C | 21.3 °C | 14.73 mm |
| May | 14 °C | 22.1 °C | 5.59 mm |
| June | 15.9 °C | 23.6 °C | 2.29 mm |
| July | 17.7 °C | 25.9 °C | 1.02 mm |
| August | 18.1 °C | 27.1 °C | 0.25 mm |
| September | 17.3 °C | 26.8 °C | 2.54 mm |
| October | 14.8 °C | 24.8 °C | 10.92 mm |
| November | 11.2 °C | 22.3 °C | 20.07 mm |
| December | 8.4 °C | 19.4 °C | 52.32 mm |
| Annual | 13.2 °C | 22.7 °C | 308.62 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10b : 1.7°C to 4.4°C |
| Plant Hardiness Zone - 2012 | Zone 10b : 1.7°C to 4.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |