Brinkley, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.1 °C (low) to 21.8 °C (high). Annual precipitation averages 1278.6 Millimeters. Brinkley is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.3 °C | 9.2 °C | 94.23 mm |
| February | 1.4 °C | 11.8 °C | 106.43 mm |
| March | 5.8 °C | 16.8 °C | 126.49 mm |
| April | 10.8 °C | 22.2 °C | 138.43 mm |
| May | 16.2 °C | 26.7 °C | 143.26 mm |
| June | 20.7 °C | 30.9 °C | 85.85 mm |
| July | 22.3 °C | 32.4 °C | 85.85 mm |
| August | 21.3 °C | 32.3 °C | 66.04 mm |
| September | 17.1 °C | 29 °C | 77.22 mm |
| October | 10.7 °C | 23.4 °C | 102.36 mm |
| November | 5.2 °C | 16.3 °C | 118.62 mm |
| December | 1.4 °C | 10.9 °C | 133.86 mm |
| Annual | 11.1 °C | 21.8 °C | 1278.64 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |