Green Valley, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 52.1 °F (low) to 83.6 °F (high). Annual precipitation averages 12.8 Inches. Green Valley is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.9 °F | 66.8 °F | 0.69 in. |
| February | 38.4 °F | 69.0 °F | 0.84 in. |
| March | 43.2 °F | 75.4 °F | 0.76 in. |
| April | 47.9 °F | 82.3 °F | 0.29 in. |
| May | 55.6 °F | 91.0 °F | 0.17 in. |
| June | 65.5 °F | 100.1 °F | 0.41 in. |
| July | 71.8 °F | 99.0 °F | 2.98 in. |
| August | 70.6 °F | 97.4 °F | 2.6 in. |
| September | 64.9 °F | 94.4 °F | 1.69 in. |
| October | 53.0 °F | 86.3 °F | 0.84 in. |
| November | 42.8 °F | 75.3 °F | 0.57 in. |
| December | 35.4 °F | 65.8 °F | 0.95 in. |
| Annual | 52.1 °F | 83.6 °F | 12.79 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |