| 2023 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 6b: -5F to 0F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate | |
| Ecoregion: | 27d - Wellington-McPherson Lowland | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 74631 - Blackwell, OK | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 26 | 34 | 44 | 55 | 65 | 70 | 68 | 60 | 48 | 35 | 25 | 46 |
| Avg Max Temp (°F) | 44 | 51 | 60 | 70 | 79 | 88 | 94 | 93 | 84 | 74 | 58 | 47 | 70 |
| Avg Precip (In.) | 1 | 1.22 | 2.88 | 3.5 | 4.95 | 4.35 | 3.53 | 3.33 | 3.68 | 2.91 | 2.57 | 1.46 | 35.37 |