Summit, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 54 °F (low) to 84.2 °F (high). Annual precipitation averages 11.4 Inches. Summit is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Dec. 11 - Dec. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.6 °F | 66.7 °F | 0.85 in. |
| February | 40.0 °F | 69.3 °F | 0.92 in. |
| March | 44.9 °F | 75.9 °F | 0.69 in. |
| April | 49.8 °F | 83.0 °F | 0.32 in. |
| May | 57.9 °F | 91.6 °F | 0.19 in. |
| June | 67.4 °F | 101.2 °F | 0.26 in. |
| July | 73.7 °F | 100.5 °F | 2.14 in. |
| August | 72.5 °F | 98.7 °F | 2.21 in. |
| September | 67.2 °F | 95.5 °F | 1.28 in. |
| October | 55.6 °F | 87.0 °F | 1.02 in. |
| November | 44.7 °F | 75.7 °F | 0.54 in. |
| December | 37.2 °F | 65.8 °F | 0.95 in. |
| Annual | 54 °F | 84.2 °F | 11.37 in. |
| Average First Frost Date | Dec. 11 - Dec. 20 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°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 |