McNary, Arizona has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 33.8 °F (low) to 63.3 °F (high). Annual precipitation averages 24.9 Inches. McNary is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.7 °F | 45.4 °F | 2.38 in. |
| February | 21.2 °F | 48.1 °F | 2.16 in. |
| March | 25.2 °F | 53.7 °F | 2.27 in. |
| April | 29.5 °F | 60.9 °F | 1.08 in. |
| May | 37.4 °F | 69.9 °F | 0.71 in. |
| June | 46.4 °F | 80.7 °F | 0.58 in. |
| July | 51.7 °F | 81.7 °F | 3.58 in. |
| August | 50.9 °F | 78.8 °F | 4.11 in. |
| September | 45.2 °F | 74.7 °F | 2.16 in. |
| October | 35.0 °F | 65.4 °F | 1.73 in. |
| November | 25.4 °F | 54.4 °F | 1.59 in. |
| December | 18.9 °F | 45.6 °F | 2.53 in. |
| Annual | 33.8 °F | 63.3 °F | 24.88 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |