Forest Ranch, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 48 °F (low) to 70.5 °F (high). Annual precipitation averages 53.5 Inches. Forest Ranch is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.5 °F | 53.9 °F | 9.71 in. |
| February | 38.3 °F | 55.8 °F | 9.69 in. |
| March | 40.4 °F | 60.0 °F | 7.54 in. |
| April | 42.9 °F | 64.8 °F | 4.48 in. |
| May | 49.3 °F | 73.5 °F | 2.52 in. |
| June | 56.4 °F | 83.4 °F | 0.85 in. |
| July | 62.6 °F | 91.5 °F | 0.05 in. |
| August | 61.3 °F | 90.9 °F | 0.12 in. |
| September | 58.6 °F | 85.8 °F | 0.42 in. |
| October | 50.5 °F | 73.7 °F | 2.66 in. |
| November | 41.8 °F | 59.9 °F | 5.03 in. |
| December | 36.9 °F | 52.4 °F | 10.47 in. |
| Annual | 48 °F | 70.5 °F | 53.54 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |