| 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 Zone 7a: 0°F to 5°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: | 37d - Arkansas Valley Plains |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 74937 - Heavener, OK | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 25 | 30 | 39 | 47 | 56 | 64 | 68 | 67 | 60 | 48 | 38 | 29 | 48 |
| Avg Max Temp (°F) | 50 | 56 | 65 | 73 | 80 | 88 | 93 | 93 | 85 | 76 | 62 | 53 | 73 |
| Avg Precip (In.) | 2.56 | 2.84 | 4.05 | 4.72 | 6.39 | 4.79 | 3.46 | 3.11 | 4.51 | 4.36 | 4.99 | 3.95 | 49.74 |