Oakley, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 49.5 °F (low) to 72.3 °F (high). Annual precipitation averages 14 Inches. Oakley 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. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.5 °F | 55.7 °F | 2.86 in. |
| February | 42.2 °F | 60.6 °F | 2.72 in. |
| March | 45.2 °F | 65.5 °F | 1.9 in. |
| April | 48.2 °F | 69.9 °F | 1.0 in. |
| May | 52.7 °F | 76.3 °F | 0.51 in. |
| June | 56.7 °F | 83.0 °F | 0.13 in. |
| July | 58.7 °F | 88.1 °F | 0.0 in. |
| August | 58.7 °F | 86.7 °F | 0.03 in. |
| September | 57.1 °F | 84.3 °F | 0.06 in. |
| October | 51.8 °F | 76.6 °F | 0.61 in. |
| November | 43.9 °F | 64.8 °F | 1.42 in. |
| December | 39.3 °F | 55.9 °F | 2.76 in. |
| Annual | 49.5 °F | 72.3 °F | 14 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |