San Ardo, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 7 °C (low) to 23.7 °C (high). Annual precipitation averages 305.6 Millimeters. San Ardo is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.9 °C | 16.8 °C | 71.37 mm |
| February | 3.9 °C | 17.8 °C | 69.85 mm |
| March | 4.9 °C | 20 °C | 50.04 mm |
| April | 5.8 °C | 21.6 °C | 18.29 mm |
| May | 8.1 °C | 25.3 °C | 6.6 mm |
| June | 10 °C | 28.8 °C | 1.78 mm |
| July | 12 °C | 30.6 °C | 0.76 mm |
| August | 11.9 °C | 30.8 °C | 0.51 mm |
| September | 10.6 °C | 30.2 °C | 1.27 mm |
| October | 7.3 °C | 25.8 °C | 15.75 mm |
| November | 4.6 °C | 20.7 °C | 25.91 mm |
| December | 2.4 °C | 16.4 °C | 43.43 mm |
| Annual | 7 °C | 23.7 °C | 305.56 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 |