Brinkley, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.9 °F (low) to 71.3 °F (high). Annual precipitation averages 50.3 Inches. 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 | 31.4 °F | 48.5 °F | 3.71 in. |
| February | 34.5 °F | 53.3 °F | 4.19 in. |
| March | 42.4 °F | 62.3 °F | 4.98 in. |
| April | 51.5 °F | 71.9 °F | 5.45 in. |
| May | 61.1 °F | 80.1 °F | 5.64 in. |
| June | 69.3 °F | 87.6 °F | 3.38 in. |
| July | 72.1 °F | 90.4 °F | 3.38 in. |
| August | 70.3 °F | 90.1 °F | 2.6 in. |
| September | 62.8 °F | 84.2 °F | 3.04 in. |
| October | 51.3 °F | 74.1 °F | 4.03 in. |
| November | 41.4 °F | 61.4 °F | 4.67 in. |
| December | 34.5 °F | 51.6 °F | 5.27 in. |
| Annual | 51.9 °F | 71.3 °F | 50.34 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |