Casa Grande, Arizona has a Hot Desert Climate climate (Köppen classification: BWh). Average annual temperatures range from 56 °F (low) to 86.1 °F (high). Annual precipitation averages 8.1 Inches. 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 | 38.4 °F | 66.7 °F | 0.98 in. |
| February | 41.4 °F | 70.3 °F | 0.92 in. |
| March | 46.1 °F | 77.0 °F | 0.9 in. |
| April | 51.7 °F | 84.6 °F | 0.26 in. |
| May | 60.5 °F | 93.8 °F | 0.2 in. |
| June | 69.2 °F | 103.4 °F | 0.11 in. |
| July | 77.4 °F | 104.9 °F | 0.82 in. |
| August | 76.8 °F | 103.3 °F | 1.38 in. |
| September | 70.1 °F | 98.9 °F | 0.61 in. |
| October | 57.4 °F | 88.7 °F | 0.55 in. |
| November | 45.4 °F | 76.1 °F | 0.5 in. |
| December | 37.9 °F | 65.6 °F | 0.88 in. |
| Annual | 56 °F | 86.1 °F | 8.11 in. |
| 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 : 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 |