| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 2012 Hardiness Zone: | Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7a: 0F to 5F |
| Average First Frost Date: | Nov. 1 - Nov. 10 |
| Average Last Frost Date: | Apr. 1 - Apr. 10 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 29h - Northwestern Cross Timbers |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 73533 - Duncan, OK | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 27 | 32 | 40 | 49 | 58 | 67 | 71 | 70 | 62 | 51 | 38 | 29 | 49 |
| Avg Max Temp (°F) | 50 | 56 | 64 | 73 | 81 | 89 | 94 | 94 | 86 | 76 | 62 | 53 | 73 |
| Avg Precip (In.) | 1.38 | 1.81 | 2.81 | 3.25 | 5.28 | 4.44 | 2.44 | 2.53 | 3.97 | 3.81 | 2.32 | 1.97 | 36 |