| | Port Mansfield, TX | Port Isabel, TX | United States |
| Rainfall | 26.6 | 27 | 38.1 |
| Snowfall | 0.1 | 0.1 | 27.8 |
| Precipitation Days | 65.4 | 72.5 | 106.2 |
| Sunny | 227 | 225 | 205 |
| Avg. July High | 93.3 | 90.6 | 85.8 |
| Avg. Jan. Low | 48 | 52.7 | 21.7 |
| Comfort Index (higher=better) | 6.6 | 6.7 | 7 |
| UV Index | 6.1 | 6.5 | 4.3 |
| Elevation ft. | 7 | 10 | 2443 |