Tullahassee, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.6 °C (low) to 22 °C (high). Annual precipitation averages 1121.4 Millimeters. Tullahassee is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 9.5 °C | 54.36 mm |
| February | -0.8 °C | 11.9 °C | 55.88 mm |
| March | 4 °C | 17 °C | 91.19 mm |
| April | 8.9 °C | 22 °C | 114.3 mm |
| May | 14.4 °C | 26 °C | 154.69 mm |
| June | 19.6 °C | 30.7 °C | 117.09 mm |
| July | 21.7 °C | 33.4 °C | 92.46 mm |
| August | 20.9 °C | 33.6 °C | 81.03 mm |
| September | 16.5 °C | 29.4 °C | 107.19 mm |
| October | 9.8 °C | 23.1 °C | 99.31 mm |
| November | 3.8 °C | 16.7 °C | 84.33 mm |
| December | -1.1 °C | 10.7 °C | 69.6 mm |
| Annual | 9.6 °C | 22 °C | 1121.43 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |