Green Valley, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 11.2 °C (low) to 28.7 °C (high). Annual precipitation averages 324.9 Millimeters. 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 | 2.2 °C | 19.3 °C | 17.53 mm |
| February | 3.6 °C | 20.6 °C | 21.34 mm |
| March | 6.2 °C | 24.1 °C | 19.3 mm |
| April | 8.8 °C | 27.9 °C | 7.37 mm |
| May | 13.1 °C | 32.8 °C | 4.32 mm |
| June | 18.6 °C | 37.8 °C | 10.41 mm |
| July | 22.1 °C | 37.2 °C | 75.69 mm |
| August | 21.4 °C | 36.3 °C | 66.04 mm |
| September | 18.3 °C | 34.7 °C | 42.93 mm |
| October | 11.7 °C | 30.2 °C | 21.34 mm |
| November | 6 °C | 24.1 °C | 14.48 mm |
| December | 1.9 °C | 18.8 °C | 24.13 mm |
| Annual | 11.2 °C | 28.7 °C | 324.88 mm |
| 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 : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |