Hidden Valley Lake, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 7.3 °C (low) to 22.9 °C (high). Annual precipitation averages 943.4 Millimeters. Hidden Valley Lake is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 13.7 °C | 202.18 mm |
| February | 2.7 °C | 15.2 °C | 178.56 mm |
| March | 4.1 °C | 17.6 °C | 120.14 mm |
| April | 5.6 °C | 20.2 °C | 53.85 mm |
| May | 8.5 °C | 24.7 °C | 37.08 mm |
| June | 11.8 °C | 29.8 °C | 5.08 mm |
| July | 14 °C | 34.2 °C | 0 mm |
| August | 13.4 °C | 33.6 °C | 0.51 mm |
| September | 11.4 °C | 30.6 °C | 2.29 mm |
| October | 8 °C | 24.4 °C | 43.43 mm |
| November | 4.1 °C | 17.7 °C | 91.19 mm |
| December | 2.2 °C | 13.4 °C | 209.04 mm |
| Annual | 7.3 °C | 22.9 °C | 943.35 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |