Santa Rosa, Arizona has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 55.8 °F (low) to 86.2 °F (high). Annual precipitation averages 9.3 Inches. Santa Rosa is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.1 °F | 67.3 °F | 0.61 in. |
| February | 41.0 °F | 70.8 °F | 0.85 in. |
| March | 46.0 °F | 77.6 °F | 0.57 in. |
| April | 51.1 °F | 84.7 °F | 0.15 in. |
| May | 59.9 °F | 93.9 °F | 0.03 in. |
| June | 69.1 °F | 103.2 °F | 0.15 in. |
| July | 76.2 °F | 104.3 °F | 2.17 in. |
| August | 75.8 °F | 102.5 °F | 2.11 in. |
| September | 70.1 °F | 98.8 °F | 0.86 in. |
| October | 58.0 °F | 88.8 °F | 0.54 in. |
| November | 45.9 °F | 76.6 °F | 0.41 in. |
| December | 38.3 °F | 66.1 °F | 0.87 in. |
| Annual | 55.8 °F | 86.2 °F | 9.32 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 30-40 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 | Severe Drought |
| Köppen Climate Classification | BWh - Hot Desert Climate |