| 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: | Dec. 11 - Dec. 20 | |
| Average Last Frost Date: | Feb. 21 - Feb. 29 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical 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 78839 - Crystal City, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 42 | 46 | 54 | 60 | 68 | 72 | 74 | 74 | 70 | 62 | 52 | 44 | 60 |
| Avg Max Temp (°F) | 66 | 71 | 79 | 85 | 90 | 95 | 97 | 97 | 93 | 85 | 74 | 67 | 83 |
| Avg Precip (In.) | .92 | 1.08 | 1.09 | 1.73 | 2.57 | 3.2 | 1.58 | 2.09 | 2.16 | 2.49 | 1.14 | .86 | 20.91 |