| 2023 Hardiness Zone: | Zone 10b: 35°F to 40°F Zone 10a: 30°F to 35°F |
| 2012 Hardiness Zone: | Zone 10a: 30°F to 35°F |
| 1990 Hardiness Zone: | Zone 9b: 25F to 30F |
| Average First Frost Date: | Frost Rare |
| Average Last Frost Date: | Frost Rare |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 34f - Lower Rio Grande Alluvial Floodplain |
| Heat Zone Days: | 151 - 180 days Over 86°F |
Annual Climate Data for ZIP Code 78521 - Brownsville, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 50 | 53 | 59 | 65 | 71 | 75 | 75 | 75 | 73 | 66 | 58 | 52 | 64 |
| Avg Max Temp (°F) | 69 | 72 | 78 | 83 | 87 | 91 | 93 | 93 | 90 | 84 | 77 | 70 | 82 |
| Avg Precip (In.) | 1.39 | 1.19 | .93 | 1.95 | 2.55 | 2.87 | 1.76 | 2.93 | 5.32 | 3.68 | 1.73 | 1.15 | 27.46 |