| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 1990 Hardiness Zone: | Zone 8b: 15F to 20F |
| Average First Frost Date: | Nov. 21 - Nov. 30 |
| Average Last Frost Date: | Feb. 21 - Feb. 29 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 35e - Southern Tertiary Uplands |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 77378 - Willis, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 39 | 42 | 49 | 56 | 64 | 70 | 72 | 72 | 67 | 58 | 48 | 41 | 57 |
| Avg Max Temp (°F) | 60 | 64 | 72 | 78 | 85 | 91 | 95 | 95 | 89 | 80 | 70 | 62 | 78 |
| Avg Precip (In.) | 4.2 | 3.14 | 3.34 | 3.68 | 5.4 | 4.76 | 2.99 | 3.54 | 4.59 | 4.42 | 4.63 | 4.26 | 48.96 |