Highland, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 51.9 °F (low) to 79.2 °F (high). Annual precipitation averages 13.9 Inches. 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 | 42.6 °F | 66.6 °F | 2.74 in. |
| February | 43.3 °F | 66.8 °F | 3.45 in. |
| March | 46.1 °F | 70.4 °F | 2.29 in. |
| April | 48.8 °F | 74.8 °F | 0.92 in. |
| May | 53.5 °F | 79.9 °F | 0.37 in. |
| June | 57.6 °F | 87.6 °F | 0.09 in. |
| July | 62.9 °F | 94.7 °F | 0.08 in. |
| August | 63.8 °F | 95.8 °F | 0.09 in. |
| September | 61.1 °F | 92.2 °F | 0.16 in. |
| October | 54.3 °F | 82.3 °F | 0.58 in. |
| November | 47.0 °F | 73.6 °F | 0.88 in. |
| December | 41.7 °F | 65.7 °F | 2.26 in. |
| Annual | 51.9 °F | 79.2 °F | 13.91 in. |
| 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 : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |