Potrero, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 46.5 °F (low) to 76.4 °F (high). Annual precipitation averages 16.4 Inches. Potrero is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.6 °F | 64.7 °F | 2.89 in. |
| February | 38.8 °F | 63.9 °F | 3.84 in. |
| March | 40.0 °F | 67.5 °F | 2.62 in. |
| April | 41.8 °F | 71.0 °F | 1.18 in. |
| May | 46.1 °F | 76.2 °F | 0.46 in. |
| June | 50.5 °F | 84.6 °F | 0.08 in. |
| July | 57.8 °F | 91.1 °F | 0.26 in. |
| August | 58.9 °F | 92.9 °F | 0.12 in. |
| September | 55.6 °F | 89.5 °F | 0.25 in. |
| October | 48.8 °F | 80.3 °F | 0.69 in. |
| November | 42.6 °F | 71.7 °F | 1.39 in. |
| December | 38.2 °F | 63.9 °F | 2.57 in. |
| Annual | 46.5 °F | 76.4 °F | 16.35 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |