Hidden Valley Lake, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 45.2 °F (low) to 73.2 °F (high). Annual precipitation averages 37.1 Inches. 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 | 36.1 °F | 56.6 °F | 7.96 in. |
| February | 36.9 °F | 59.4 °F | 7.03 in. |
| March | 39.3 °F | 63.6 °F | 4.73 in. |
| April | 42.1 °F | 68.3 °F | 2.12 in. |
| May | 47.3 °F | 76.4 °F | 1.46 in. |
| June | 53.3 °F | 85.7 °F | 0.2 in. |
| July | 57.2 °F | 93.5 °F | 0.0 in. |
| August | 56.1 °F | 92.4 °F | 0.02 in. |
| September | 52.5 °F | 87.1 °F | 0.09 in. |
| October | 46.4 °F | 75.9 °F | 1.71 in. |
| November | 39.4 °F | 63.8 °F | 3.59 in. |
| December | 35.9 °F | 56.2 °F | 8.23 in. |
| Annual | 45.2 °F | 73.2 °F | 37.14 in. |
| 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 : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |