McNeal, Arizona has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 8.4 °C (low) to 26.8 °C (high). Annual precipitation averages 273.6 Millimeters. McNeal is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1 °C | 17.2 °C | 17.78 mm |
| February | 0.9 °C | 19.2 °C | 15.24 mm |
| March | 3.5 °C | 22.8 °C | 13.72 mm |
| April | 6.4 °C | 26.7 °C | 3.3 mm |
| May | 10.7 °C | 31.1 °C | 4.57 mm |
| June | 16 °C | 35.9 °C | 6.6 mm |
| July | 19.2 °C | 35 °C | 54.86 mm |
| August | 18.6 °C | 33.8 °C | 72.14 mm |
| September | 15.3 °C | 32.3 °C | 27.69 mm |
| October | 8.8 °C | 28.3 °C | 23.11 mm |
| November | 2.8 °C | 21.8 °C | 15.24 mm |
| December | -0.7 °C | 16.9 °C | 19.3 mm |
| Annual | 8.4 °C | 26.8 °C | 273.55 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |