Tahlequah, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 21.8 °C (high). Annual precipitation averages 1224.8 Millimeters. Tahlequah is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.7 °C | 9.4 °C | 62.74 mm |
| February | -0.8 °C | 11.8 °C | 63.75 mm |
| March | 3.9 °C | 16.7 °C | 98.04 mm |
| April | 8.6 °C | 21.8 °C | 116.33 mm |
| May | 14.1 °C | 25.8 °C | 162.05 mm |
| June | 19.1 °C | 30.3 °C | 132.59 mm |
| July | 21.3 °C | 33.2 °C | 102.11 mm |
| August | 20.5 °C | 33.2 °C | 90.17 mm |
| September | 16.2 °C | 29.2 °C | 115.82 mm |
| October | 9.7 °C | 22.8 °C | 112.78 mm |
| November | 3.8 °C | 16.4 °C | 95.25 mm |
| December | -1.1 °C | 10.5 °C | 73.15 mm |
| Annual | 9.4 °C | 21.8 °C | 1224.78 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |