Emerald Lake Hills, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 47.8 °F (low) to 71.4 °F (high). Annual precipitation averages 24.2 Inches. Emerald Lake Hills is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.1 °F | 59.6 °F | 4.9 in. |
| February | 43.1 °F | 61.8 °F | 4.91 in. |
| March | 44.2 °F | 64.8 °F | 3.63 in. |
| April | 45.5 °F | 68.0 °F | 1.74 in. |
| May | 48.9 °F | 73.5 °F | 0.64 in. |
| June | 51.7 °F | 79.6 °F | 0.17 in. |
| July | 54.1 °F | 83.3 °F | 0.02 in. |
| August | 54.3 °F | 82.4 °F | 0.04 in. |
| September | 53.2 °F | 81.9 °F | 0.09 in. |
| October | 50.1 °F | 76.3 °F | 0.98 in. |
| November | 45.2 °F | 65.9 °F | 2.26 in. |
| December | 41.4 °F | 59.1 °F | 4.84 in. |
| Annual | 47.8 °F | 71.4 °F | 24.22 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| 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 |