| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F | |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F | |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F | |
| Average First Frost Date: | Jan. 11 - Jan. 20 | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | BSh - Hot Semi-Arid Climate | |
| Ecoregion: | 31c - Texas-Tamaulipan Thornscrub | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 151 - 180 days Over 86°F |
Annual Climate Data for ZIP Code 78017 - Dilley, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 40 | 44 | 52 | 59 | 67 | 71 | 73 | 73 | 69 | 60 | 50 | 42 | 58 |
| Avg Max Temp (°F) | 64 | 69 | 77 | 84 | 89 | 94 | 97 | 97 | 92 | 84 | 73 | 66 | 82 |
| Avg Precip (In.) | 1.09 | 1.23 | 1.26 | 2 | 3.1 | 3.26 | 1.44 | 2.4 | 2.48 | 3.1 | 1.44 | 1.15 | 23.96 |