| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°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: | 32a - Northern Blackland Prairie |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 75421 - Brookston, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 30 | 34 | 42 | 50 | 60 | 68 | 72 | 70 | 63 | 52 | 41 | 33 | 51 |
| Avg Max Temp (°F) | 52 | 58 | 66 | 74 | 81 | 89 | 94 | 94 | 86 | 76 | 63 | 54 | 74 |
| Avg Precip (In.) | 2.61 | 3.07 | 4.02 | 3.61 | 5.63 | 4.43 | 3.42 | 2.28 | 4.05 | 5.01 | 4.52 | 3.92 | 46.55 |