| 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 8a: 10F to 15F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 30a - Edwards Plateau Woodland |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 78631 - Harper, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 36 | 44 | 51 | 60 | 66 | 68 | 67 | 62 | 53 | 42 | 34 | 51 |
| Avg Max Temp (°F) | 60 | 64 | 71 | 78 | 83 | 89 | 92 | 92 | 87 | 78 | 67 | 61 | 77 |
| Avg Precip (In.) | 1.1 | 1.79 | 1.79 | 2.06 | 3.79 | 3.6 | 1.85 | 3.09 | 2.7 | 3.46 | 1.82 | 1.81 | 28.87 |