| 2023 Hardiness Zone: | Zone 8a: 10°F to 15°F |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F |
| 1990 Hardiness Zone: | Zone 7b: 5F to 10F |
| 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: | 35h - Blackland Prairie |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 74764 - Valliant, OK | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 29 | 33 | 41 | 49 | 59 | 67 | 71 | 69 | 63 | 51 | 40 | 32 | 50 |
| Avg Max Temp (°F) | 52 | 58 | 66 | 74 | 81 | 88 | 93 | 94 | 86 | 77 | 64 | 55 | 74 |
| Avg Precip (In.) | 2.75 | 3.36 | 4.41 | 4.16 | 6.21 | 4.38 | 3.6 | 2.6 | 4.84 | 4.91 | 5.01 | 4.49 | 50.72 |