Quinlan, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.3 °C (low) to 22 °C (high). Annual precipitation averages 686.3 Millimeters. Quinlan is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.3 °C | 9.3 °C | 20.83 mm |
| February | -3.8 °C | 11.2 °C | 25.4 mm |
| March | 1.2 °C | 16.7 °C | 48.26 mm |
| April | 6.1 °C | 21.7 °C | 64.01 mm |
| May | 12.3 °C | 26.6 °C | 94.23 mm |
| June | 18.1 °C | 31.9 °C | 97.79 mm |
| July | 20.6 °C | 34.9 °C | 71.37 mm |
| August | 19.6 °C | 34.1 °C | 78.99 mm |
| September | 14.9 °C | 29.8 °C | 55.88 mm |
| October | 7.6 °C | 22.9 °C | 67.06 mm |
| November | 0.8 °C | 15.8 °C | 32.26 mm |
| December | -4.4 °C | 9.6 °C | 30.23 mm |
| Annual | 7.3 °C | 22 °C | 686.31 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |