San Miguel, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 6.7 °C (low) to 25.2 °C (high). Annual precipitation averages 297.5 Millimeters. 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 | 2.2 °C | 16.6 °C | 68.33 mm |
| February | 3.3 °C | 17.7 °C | 62.48 mm |
| March | 4.6 °C | 19.8 °C | 54.36 mm |
| April | 5.3 °C | 23.3 °C | 18.29 mm |
| May | 7.9 °C | 27.2 °C | 7.37 mm |
| June | 10.2 °C | 31.4 °C | 0.76 mm |
| July | 12.2 °C | 34.2 °C | 1.78 mm |
| August | 12.1 °C | 34.8 °C | 0.51 mm |
| September | 10.4 °C | 32.8 °C | 1.27 mm |
| October | 7.3 °C | 27.6 °C | 11.43 mm |
| November | 3.7 °C | 20.7 °C | 21.59 mm |
| December | 1.5 °C | 16.3 °C | 49.28 mm |
| Annual | 6.7 °C | 25.2 °C | 297.45 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |