| 2023 Hardiness Zone: | Zone 10a: 30°F to 35°F |
| 2012 Hardiness Zone: | Zone 9b: 25°F to 30°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Jan. 11 - Jan. 20 |
| Average Last Frost Date: | Jan. 21 - Jan. 31 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 34e - Lower Rio Grande Valley |
| Heat Zone Days: | 181 - 210 days Over 86°F |
Annual Climate Data for ZIP Code 78593 - Santa Rosa, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 48 | 51 | 58 | 63 | 70 | 73 | 74 | 74 | 71 | 64 | 56 | 49 | 63 |
| Avg Max Temp (°F) | 69 | 73 | 80 | 85 | 89 | 93 | 95 | 96 | 92 | 86 | 78 | 71 | 84 |
| Avg Precip (In.) | 1.36 | 1.59 | 1.12 | 1.69 | 2.76 | 2.92 | 1.94 | 2.65 | 4.71 | 2.83 | 1.36 | 1.22 | 26.15 |