McAllen, Texas has a Hot Semi-Arid Climate climate (Köppen classification: BSh). Average annual temperatures range from 64.4 °F (low) to 85.7 °F (high). Annual precipitation averages 21.5 Inches. McAllen is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 49.4 °F | 71.0 °F | 0.8 in. |
| February | 53.4 °F | 75.6 °F | 0.94 in. |
| March | 59.1 °F | 80.9 °F | 1.14 in. |
| April | 65.0 °F | 86.6 °F | 1.35 in. |
| May | 71.3 °F | 91.3 °F | 2.18 in. |
| June | 75.2 °F | 95.7 °F | 2.49 in. |
| July | 76.2 °F | 96.9 °F | 2.23 in. |
| August | 76.2 °F | 98.1 °F | 1.53 in. |
| September | 72.8 °F | 92.9 °F | 4.64 in. |
| October | 65.8 °F | 87.9 °F | 2.2 in. |
| November | 57.4 °F | 79.3 °F | 1.18 in. |
| December | 50.8 °F | 72.4 °F | 0.82 in. |
| Annual | 64.4 °F | 85.7 °F | 21.5 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSh - Hot Semi-Arid Climate |