Casa Grande, Arizona has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 13.3 °C (low) to 30.1 °C (high). Annual precipitation averages 206 Millimeters. Casa Grande 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 | 3.6 °C | 19.3 °C | 24.89 mm |
| February | 5.2 °C | 21.3 °C | 23.37 mm |
| March | 7.8 °C | 25 °C | 22.86 mm |
| April | 10.9 °C | 29.2 °C | 6.6 mm |
| May | 15.8 °C | 34.3 °C | 5.08 mm |
| June | 20.7 °C | 39.7 °C | 2.79 mm |
| July | 25.2 °C | 40.5 °C | 20.83 mm |
| August | 24.9 °C | 39.6 °C | 35.05 mm |
| September | 21.2 °C | 37.2 °C | 15.49 mm |
| October | 14.1 °C | 31.5 °C | 13.97 mm |
| November | 7.4 °C | 24.5 °C | 12.7 mm |
| December | 3.3 °C | 18.7 °C | 22.35 mm |
| Annual | 13.3 °C | 30.1 °C | 205.98 mm |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 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 | Severe Drought |
| Köppen Climate Classification | BWh - Hot Desert Climate |