| 2023 Hardiness Zone: | Zone 7b: 5°F to 10°F 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: | 27o - Cross Timbers Transition | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 74074 - Stillwater, OK | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 22 | 27 | 36 | 46 | 57 | 66 | 71 | 69 | 60 | 48 | 36 | 26 | 47 |
| Avg Max Temp (°F) | 47 | 53 | 62 | 71 | 79 | 87 | 93 | 93 | 85 | 75 | 60 | 50 | 71 |
| Avg Precip (In.) | 1.28 | 1.65 | 3.2 | 3.4 | 5.45 | 4.34 | 2.78 | 2.96 | 4.14 | 3.21 | 2.6 | 1.73 | 36.73 |