Hornitos, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 10.4 °C (low) to 24.9 °C (high). Annual precipitation averages 463.6 Millimeters. 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 | 4.2 °C | 13.8 °C | 90.17 mm |
| February | 5.3 °C | 16.2 °C | 76.71 mm |
| March | 6.7 °C | 18.9 °C | 77.72 mm |
| April | 8.6 °C | 22.4 °C | 40.89 mm |
| May | 11.4 °C | 27.9 °C | 19.56 mm |
| June | 14.9 °C | 33.1 °C | 5.08 mm |
| July | 18.2 °C | 36.8 °C | 1.02 mm |
| August | 17.8 °C | 36.3 °C | 1.02 mm |
| September | 15.4 °C | 33.3 °C | 1.78 mm |
| October | 11.8 °C | 27.2 °C | 23.11 mm |
| November | 7.2 °C | 19.1 °C | 43.18 mm |
| December | 3.8 °C | 13.9 °C | 83.31 mm |
| Annual | 10.4 °C | 24.9 °C | 463.55 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |