| 2023 Hardiness Zone: | Zone 9b: 25°F to 30°F | |
| 2012 Hardiness Zone: | Zone 9a: 20°F to 25°F Zone 9b: 25°F to 30°F | |
| 1990 Hardiness Zone: | Zone 9a: 20F to 25F | |
| Average First Frost Date: | Jan. 21 - Jan. 31 | |
| Average Last Frost Date: | Jan. 21 - Jan. 31 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 34a - Northern Humid Gulf Coastal Prairies | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 77640 - Port Arthur, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 43 | 45 | 52 | 58 | 66 | 72 | 74 | 73 | 69 | 59 | 51 | 44 | 59 |
| Avg Max Temp (°F) | 61 | 65 | 72 | 78 | 84 | 89 | 92 | 92 | 88 | 80 | 71 | 64 | 78 |
| Avg Precip (In.) | 5.62 | 3.39 | 3.77 | 3.78 | 5.73 | 6.37 | 5.26 | 4.82 | 5.99 | 4.67 | 4.81 | 5.05 | 59.26 |