McNeil, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.1 °C (low) to 23.9 °C (high). Annual precipitation averages 1416.8 Millimeters. McNeil is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.7 °C | 12.8 °C | 113.79 mm |
| February | 2.2 °C | 15.1 °C | 119.63 mm |
| March | 6.1 °C | 19.6 °C | 145.03 mm |
| April | 10.3 °C | 23.9 °C | 142.75 mm |
| May | 15.6 °C | 27.7 °C | 131.57 mm |
| June | 19.9 °C | 31.6 °C | 112.52 mm |
| July | 21.7 °C | 33.7 °C | 92.71 mm |
| August | 21.1 °C | 33.9 °C | 85.85 mm |
| September | 17.5 °C | 30.7 °C | 98.55 mm |
| October | 10.8 °C | 24.8 °C | 124.71 mm |
| November | 5.5 °C | 18.5 °C | 108.2 mm |
| December | 1.9 °C | 13.9 °C | 141.48 mm |
| Annual | 11.1 °C | 23.9 °C | 1416.79 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |