Mountain Ranch, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 46 °F (low) to 73 °F (high). Annual precipitation averages 36.8 Inches. Mountain Ranch 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 | 36.1 °F | 54.9 °F | 6.89 in. |
| February | 37.0 °F | 57.4 °F | 6.05 in. |
| March | 39.2 °F | 62.2 °F | 5.49 in. |
| April | 41.4 °F | 67.4 °F | 3.33 in. |
| May | 46.8 °F | 76.1 °F | 2.02 in. |
| June | 53.0 °F | 86.1 °F | 0.57 in. |
| July | 59.5 °F | 94.2 °F | 0.07 in. |
| August | 59.2 °F | 93.7 °F | 0.35 in. |
| September | 55.5 °F | 88.5 °F | 0.29 in. |
| October | 48.0 °F | 77.7 °F | 1.81 in. |
| November | 40.1 °F | 63.6 °F | 3.53 in. |
| December | 35.6 °F | 54.2 °F | 6.35 in. |
| Annual | 46 °F | 73 °F | 36.75 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |