Nelson, Arizona has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 55.6 °F (low) to 84.9 °F (high). Annual precipitation averages 10.1 Inches. Nelson is located in USDA Plant Hardiness Zone 9a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.6 °F | 66.6 °F | 0.96 in. |
| February | 41.3 °F | 69.6 °F | 0.95 in. |
| March | 46.1 °F | 76.6 °F | 0.69 in. |
| April | 51.2 °F | 83.4 °F | 0.35 in. |
| May | 59.6 °F | 92.5 °F | 0.23 in. |
| June | 69.1 °F | 102.1 °F | 0.2 in. |
| July | 76.0 °F | 102.1 °F | 1.51 in. |
| August | 75.2 °F | 100.1 °F | 1.89 in. |
| September | 69.5 °F | 96.8 °F | 1.06 in. |
| October | 57.4 °F | 87.9 °F | 0.71 in. |
| November | 45.6 °F | 76.0 °F | 0.52 in. |
| December | 38.0 °F | 65.4 °F | 1.05 in. |
| Annual | 55.6 °F | 84.9 °F | 10.12 in. |
| Average First Frost Date | Jan. 21 - Jan. 31 |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |