Emerald Lake Hills, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 8.8 °C (low) to 21.9 °C (high). Annual precipitation averages 615.2 Millimeters. 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 | 5.6 °C | 15.3 °C | 124.46 mm |
| February | 6.2 °C | 16.6 °C | 124.71 mm |
| March | 6.8 °C | 18.2 °C | 92.2 mm |
| April | 7.5 °C | 20 °C | 44.2 mm |
| May | 9.4 °C | 23.1 °C | 16.26 mm |
| June | 10.9 °C | 26.4 °C | 4.32 mm |
| July | 12.3 °C | 28.5 °C | 0.51 mm |
| August | 12.4 °C | 28 °C | 1.02 mm |
| September | 11.8 °C | 27.7 °C | 2.29 mm |
| October | 10.1 °C | 24.6 °C | 24.89 mm |
| November | 7.3 °C | 18.8 °C | 57.4 mm |
| December | 5.2 °C | 15.1 °C | 122.94 mm |
| Annual | 8.8 °C | 21.9 °C | 615.2 mm |
| 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 : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |