San Miguel, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 44.1 °F (low) to 77.4 °F (high). Annual precipitation averages 11.7 Inches. San Miguel is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.9 °F | 61.8 °F | 2.69 in. |
| February | 37.9 °F | 63.8 °F | 2.46 in. |
| March | 40.2 °F | 67.6 °F | 2.14 in. |
| April | 41.6 °F | 74.0 °F | 0.72 in. |
| May | 46.2 °F | 80.9 °F | 0.29 in. |
| June | 50.3 °F | 88.6 °F | 0.03 in. |
| July | 54.0 °F | 93.5 °F | 0.07 in. |
| August | 53.7 °F | 94.6 °F | 0.02 in. |
| September | 50.8 °F | 91.1 °F | 0.05 in. |
| October | 45.1 °F | 81.7 °F | 0.45 in. |
| November | 38.6 °F | 69.3 °F | 0.85 in. |
| December | 34.7 °F | 61.4 °F | 1.94 in. |
| Annual | 44.1 °F | 77.4 °F | 11.71 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 | Csa - Hot-Summer Mediterranean Climate |