Thatcher, Arizona has a Cold Desert Climate climate (Köppen classification: BWk). Average annual temperatures range from 48.6 °F (low) to 81.9 °F (high). Annual precipitation averages 9.5 Inches. Thatcher is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.7 °F | 62.2 °F | 0.82 in. |
| February | 34.1 °F | 66.8 °F | 0.81 in. |
| March | 39.3 °F | 73.9 °F | 0.53 in. |
| April | 44.7 °F | 82.1 °F | 0.29 in. |
| May | 53.4 °F | 91.1 °F | 0.22 in. |
| June | 62.8 °F | 99.6 °F | 0.21 in. |
| July | 70.2 °F | 99.6 °F | 1.58 in. |
| August | 68.8 °F | 97.1 °F | 1.83 in. |
| September | 61.9 °F | 93.1 °F | 1.1 in. |
| October | 48.8 °F | 84.7 °F | 0.67 in. |
| November | 37.5 °F | 71.8 °F | 0.52 in. |
| December | 30.8 °F | 61.0 °F | 0.91 in. |
| Annual | 48.6 °F | 81.9 °F | 9.49 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BWk - Cold Desert Climate |