Garden Grove, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 12.8 °C (low) to 23.8 °C (high). Annual precipitation averages 319.3 Millimeters. Garden Grove is located in USDA Plant Hardiness Zone 10b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 8.2 °C | 19.8 °C | 74.93 mm |
| February | 8.8 °C | 19.7 °C | 82.8 mm |
| March | 10.1 °C | 20.4 °C | 45.97 mm |
| April | 11.4 °C | 22.7 °C | 15.75 mm |
| May | 13.7 °C | 23.6 °C | 7.11 mm |
| June | 15.8 °C | 25.2 °C | 2.03 mm |
| July | 17.6 °C | 27.8 °C | 1.27 mm |
| August | 18 °C | 29.1 °C | 0 mm |
| September | 16.9 °C | 28.7 °C | 2.79 mm |
| October | 14.3 °C | 26.4 °C | 12.45 mm |
| November | 10.5 °C | 22.6 °C | 18.8 mm |
| December | 7.8 °C | 19.6 °C | 55.37 mm |
| Annual | 12.8 °C | 23.8 °C | 319.27 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 | BSk - Cold Semi-Arid Climate |