Alta Sierra, California has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 46.1 °F (low) to 70.6 °F (high). Annual precipitation averages 45.9 Inches. Alta Sierra is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.8 °F | 48.9 °F | 6.54 in. |
| February | 29.4 °F | 48.3 °F | 6.71 in. |
| March | 31.0 °F | 51.7 °F | 5.3 in. |
| April | 34.2 °F | 57.1 °F | 2.84 in. |
| May | 41.1 °F | 65.6 °F | 1.44 in. |
| June | 48.7 °F | 75.5 °F | 0.51 in. |
| July | 56.0 °F | 82.9 °F | 0.27 in. |
| August | 55.3 °F | 82.4 °F | 0.19 in. |
| September | 50.5 °F | 77.2 °F | 0.24 in. |
| October | 42.2 °F | 66.6 °F | 1.44 in. |
| November | 35.0 °F | 54.8 °F | 2.66 in. |
| December | 29.3 °F | 47.4 °F | 5.85 in. |
| Annual | 40.2 °F | 63.2 °F | 33.99 in. |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.0 °F | 54.0 °F | 7.96 in. |
| February | 36.6 °F | 56.3 °F | 7.19 in. |
| March | 38.7 °F | 60.2 °F | 7.22 in. |
| April | 41.5 °F | 65.1 °F | 3.96 in. |
| May | 47.8 °F | 73.5 °F | 2.22 in. |
| June | 54.3 °F | 82.8 °F | 0.61 in. |
| July | 60.5 °F | 90.7 °F | 0.01 in. |
| August | 60.1 °F | 90.5 °F | 0.06 in. |
| September | 54.9 °F | 85.7 °F | 0.38 in. |
| October | 47.6 °F | 74.8 °F | 2.27 in. |
| November | 40.0 °F | 60.7 °F | 4.98 in. |
| December | 35.4 °F | 52.6 °F | 9.04 in. |
| Annual | 46.1 °F | 70.6 °F | 45.9 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 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 | Abnormally Dry |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |