Foothill Farms, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 9.6 °C (low) to 23.6 °C (high). Annual precipitation averages 588.3 Millimeters. Foothill Farms is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.9 °C | 13.1 °C | 105.16 mm |
| February | 5.1 °C | 15.9 °C | 105.41 mm |
| March | 6.8 °C | 18.7 °C | 84.84 mm |
| April | 8.2 °C | 21.9 °C | 47.24 mm |
| May | 11.2 °C | 26.6 °C | 31.24 mm |
| June | 14.1 °C | 31 °C | 5.33 mm |
| July | 16 °C | 34.2 °C | 0.25 mm |
| August | 15.6 °C | 33.7 °C | 0.76 mm |
| September | 13.9 °C | 31.4 °C | 4.57 mm |
| October | 10.2 °C | 25.7 °C | 32 mm |
| November | 6 °C | 18.1 °C | 58.17 mm |
| December | 3.7 °C | 13.3 °C | 113.28 mm |
| Annual | 9.6 °C | 23.6 °C | 588.25 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | 10-20 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 |