Elkhorn, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 47.7 °F (low) to 63.3 °F (high). Annual precipitation averages 17.5 Inches. Elkhorn is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.2 °F | 60.3 °F | 3.49 in. |
| February | 43.0 °F | 61.0 °F | 3.53 in. |
| March | 44.3 °F | 61.8 °F | 2.39 in. |
| April | 45.3 °F | 61.4 °F | 1.38 in. |
| May | 48.9 °F | 62.5 °F | 0.45 in. |
| June | 51.5 °F | 64.0 °F | 0.13 in. |
| July | 54.3 °F | 64.3 °F | 0.04 in. |
| August | 54.7 °F | 65.3 °F | 0.05 in. |
| September | 53.1 °F | 66.5 °F | 0.1 in. |
| October | 49.1 °F | 67.3 °F | 0.74 in. |
| November | 44.8 °F | 64.5 °F | 1.78 in. |
| December | 41.6 °F | 60.1 °F | 3.42 in. |
| Annual | 47.7 °F | 63.3 °F | 17.5 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |