Stonyford, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 6.9 °C (low) to 23.1 °C (high). Annual precipitation averages 558 Millimeters. Stonyford 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. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.3 °C | 13 °C | 123.19 mm |
| February | 2.2 °C | 15.1 °C | 111.51 mm |
| March | 3.5 °C | 17.6 °C | 74.93 mm |
| April | 5.1 °C | 20.6 °C | 30.73 mm |
| May | 8.5 °C | 25.6 °C | 24.64 mm |
| June | 11.9 °C | 30.5 °C | 9.14 mm |
| July | 14.6 °C | 34.5 °C | 1.02 mm |
| August | 13.6 °C | 33.8 °C | 2.03 mm |
| September | 11 °C | 31.3 °C | 3.3 mm |
| October | 7.3 °C | 25.3 °C | 18.29 mm |
| November | 3.4 °C | 17.4 °C | 53.85 mm |
| December | 0.9 °C | 12.8 °C | 105.41 mm |
| Annual | 6.9 °C | 23.1 °C | 558.04 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| 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 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |