| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Mar. 11 - Mar. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 32a - Northern Blackland Prairie |
| Heat Zone Days: | 121 - 150 days Over 86°F |
Annual Climate Data for ZIP Code 75137 - Duncanville, TX | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 39 | 46 | 53 | 62 | 69 | 73 | 72 | 66 | 55 | 45 | 37 | 54 |
| Avg Max Temp (°F) | 57 | 62 | 70 | 77 | 84 | 91 | 96 | 96 | 89 | 80 | 67 | 59 | 77 |
| Avg Precip (In.) | 2.09 | 2.59 | 3.15 | 3.43 | 5.07 | 3.61 | 2.24 | 2.17 | 3.02 | 4.34 | 2.86 | 2.82 | 37.39 |