Hornitos, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 50.8 °F (low) to 76.8 °F (high). Annual precipitation averages 18.3 Inches. Hornitos is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 39.5 °F | 56.9 °F | 3.55 in. |
| February | 41.5 °F | 61.2 °F | 3.02 in. |
| March | 44.0 °F | 66.1 °F | 3.06 in. |
| April | 47.4 °F | 72.3 °F | 1.61 in. |
| May | 52.6 °F | 82.2 °F | 0.77 in. |
| June | 58.9 °F | 91.5 °F | 0.2 in. |
| July | 64.7 °F | 98.2 °F | 0.04 in. |
| August | 64.0 °F | 97.3 °F | 0.04 in. |
| September | 59.7 °F | 92.0 °F | 0.07 in. |
| October | 53.3 °F | 81.0 °F | 0.91 in. |
| November | 44.9 °F | 66.3 °F | 1.7 in. |
| December | 38.8 °F | 57.1 °F | 3.28 in. |
| Annual | 50.8 °F | 76.8 °F | 18.25 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |