Oakville, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 7.5 °C (low) to 22.5 °C (high). Annual precipitation averages 855.7 Millimeters. Oakville is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.4 °C | 14.6 °C | 175.51 mm |
| February | 4.4 °C | 16.3 °C | 176.53 mm |
| March | 5.4 °C | 18.6 °C | 104.9 mm |
| April | 6.4 °C | 21.3 °C | 52.83 mm |
| May | 8.8 °C | 24.4 °C | 25.65 mm |
| June | 10.6 °C | 28 °C | 4.32 mm |
| July | 11.9 °C | 29.8 °C | 0 mm |
| August | 11.7 °C | 29.8 °C | 0.76 mm |
| September | 10.4 °C | 29.3 °C | 2.54 mm |
| October | 8.3 °C | 25.1 °C | 38.61 mm |
| November | 5.3 °C | 18.8 °C | 75.44 mm |
| December | 3.3 °C | 14.4 °C | 198.63 mm |
| Annual | 7.5 °C | 22.5 °C | 855.72 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 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 |