| 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 6b: -5F to 0F |
| 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: | 40b - Osage Cuestas |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 74447 - Okmulgee, OK | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 24 | 29 | 38 | 47 | 57 | 65 | 69 | 67 | 59 | 48 | 37 | 28 | 47 |
| Avg Max Temp (°F) | 48 | 54 | 63 | 72 | 79 | 87 | 93 | 93 | 85 | 75 | 61 | 51 | 72 |
| Avg Precip (In.) | 1.77 | 2.22 | 3.74 | 4.16 | 5.71 | 4.66 | 3.05 | 2.6 | 4.65 | 4.21 | 3.86 | 2.62 | 43.27 |