Star Valley, Arizona has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 43.4 °F (low) to 73.5 °F (high). Annual precipitation averages 20.5 Inches. Star Valley is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.1 °F | 55.5 °F | 2.47 in. |
| February | 30.5 °F | 57.9 °F | 2.58 in. |
| March | 34.3 °F | 63.9 °F | 2.05 in. |
| April | 39.5 °F | 70.8 °F | 0.8 in. |
| May | 45.8 °F | 79.4 °F | 0.58 in. |
| June | 54.4 °F | 90.3 °F | 0.29 in. |
| July | 62.3 °F | 92.8 °F | 2.75 in. |
| August | 61.6 °F | 90.7 °F | 2.83 in. |
| September | 55.2 °F | 85.8 °F | 1.5 in. |
| October | 44.4 °F | 75.8 °F | 1.26 in. |
| November | 34.6 °F | 64.3 °F | 1.26 in. |
| December | 29.3 °F | 54.8 °F | 2.12 in. |
| Annual | 43.4 °F | 73.5 °F | 20.49 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 | Moderate Drought |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |