Sun Valley, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3.7 °C (low) to 22.3 °C (high). Annual precipitation averages 215.2 Millimeters. Sun Valley is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 9.9 °C | 16.26 mm |
| February | -4.4 °C | 13.2 °C | 12.7 mm |
| March | -1.4 °C | 17.3 °C | 17.78 mm |
| April | 2 °C | 21.9 °C | 7.37 mm |
| May | 6.5 °C | 26.9 °C | 8.13 mm |
| June | 11.3 °C | 32.8 °C | 4.83 mm |
| July | 16 °C | 34.4 °C | 33.27 mm |
| August | 15.3 °C | 32.7 °C | 36.58 mm |
| September | 10.8 °C | 29.4 °C | 26.42 mm |
| October | 3.7 °C | 23.5 °C | 20.32 mm |
| November | -2.6 °C | 16.1 °C | 13.97 mm |
| December | -6.5 °C | 9.6 °C | 17.53 mm |
| Annual | 3.7 °C | 22.3 °C | 215.16 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |