| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Nov. 11 - Nov. 20 |
| Average Last Frost Date: | Mar. 11 - Mar. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 35b - Floodplains and Low Terraces |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 75657 - Jefferson, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 38 | 45 | 52 | 61 | 68 | 71 | 71 | 64 | 53 | 44 | 36 | 53 |
| Avg Max Temp (°F) | 55 | 61 | 69 | 76 | 83 | 90 | 93 | 93 | 87 | 78 | 66 | 57 | 76 |
| Avg Precip (In.) | 4.17 | 3.97 | 4.41 | 4.14 | 4.59 | 4.85 | 2.93 | 2.79 | 3.44 | 4.56 | 4.84 | 4.75 | 49.45 |