| 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. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 29a - Cross Timbers |
| Heat Zone Days: | 91 - 120 days Over 86°F |
Annual Climate Data for ZIP Code 73086 - Sulphur, OK | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 26 | 31 | 40 | 49 | 58 | 67 | 71 | 69 | 62 | 50 | 38 | 29 | 49 |
| Avg Max Temp (°F) | 49 | 55 | 64 | 73 | 80 | 87 | 93 | 94 | 86 | 75 | 61 | 52 | 72 |
| Avg Precip (In.) | 1.78 | 2.08 | 3.86 | 3.6 | 5.55 | 4.57 | 2.92 | 2.08 | 4.61 | 4.16 | 3.08 | 2.44 | 40.73 |