Highland, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 11.1 °C (low) to 26.2 °C (high). Annual precipitation averages 353.3 Millimeters. Highland is located in USDA Plant Hardiness Zone 10a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.9 °C | 19.2 °C | 69.6 mm |
| February | 6.3 °C | 19.3 °C | 87.63 mm |
| March | 7.8 °C | 21.3 °C | 58.17 mm |
| April | 9.3 °C | 23.8 °C | 23.37 mm |
| May | 11.9 °C | 26.6 °C | 9.4 mm |
| June | 14.2 °C | 30.9 °C | 2.29 mm |
| July | 17.2 °C | 34.8 °C | 2.03 mm |
| August | 17.7 °C | 35.4 °C | 2.29 mm |
| September | 16.2 °C | 33.4 °C | 4.06 mm |
| October | 12.4 °C | 27.9 °C | 14.73 mm |
| November | 8.3 °C | 23.1 °C | 22.35 mm |
| December | 5.4 °C | 18.7 °C | 57.4 mm |
| Annual | 11.1 °C | 26.2 °C | 353.32 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |