| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| Average First Frost Date: | Nov. 11 - Nov. 20 |
| Average Last Frost Date: | Mar. 21 - Mar. 31 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 73g - Western Lowlands Pleistocene Valley Trains |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 72021 - Brinkley, AR | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 29 | 33 | 42 | 50 | 59 | 68 | 71 | 69 | 62 | 50 | 41 | 33 | 50 |
| Avg Max Temp (°F) | 47 | 53 | 62 | 71 | 80 | 87 | 91 | 90 | 84 | 74 | 61 | 51 | 71 |
| Avg Precip (In.) | 3.83 | 3.85 | 4.83 | 5.24 | 5.57 | 4.07 | 3.26 | 2.59 | 3.1 | 3.6 | 4.87 | 4.64 | 49.45 |