Gonzales, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8.4 °C (low) to 20.8 °C (high). Annual precipitation averages 297.9 Millimeters. Gonzales is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.1 °C | 16.5 °C | 67.06 mm |
| February | 5.7 °C | 17.2 °C | 62.23 mm |
| March | 6.4 °C | 18.6 °C | 46.48 mm |
| April | 7.2 °C | 20 °C | 18.03 mm |
| May | 9.2 °C | 21.5 °C | 8.89 mm |
| June | 10.6 °C | 23 °C | 1.52 mm |
| July | 12.2 °C | 23.3 °C | 0.51 mm |
| August | 12.4 °C | 24.3 °C | 0.51 mm |
| September | 11.4 °C | 25.1 °C | 1.02 mm |
| October | 9.1 °C | 24 °C | 12.19 mm |
| November | 6.6 °C | 19.8 °C | 24.38 mm |
| December | 4.5 °C | 16.2 °C | 55.12 mm |
| Annual | 8.4 °C | 20.8 °C | 297.94 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |