Whitesboro, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.4 °C (low) to 23 °C (high). Annual precipitation averages 1340.9 Millimeters. Whitesboro 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 | -2.2 °C | 11.2 °C | 82.8 mm |
| February | -0.1 °C | 13.5 °C | 81.79 mm |
| March | 4.3 °C | 18.1 °C | 112.27 mm |
| April | 8.7 °C | 22.6 °C | 134.87 mm |
| May | 14.2 °C | 26.4 °C | 159.77 mm |
| June | 18.8 °C | 31.2 °C | 111 mm |
| July | 20.8 °C | 34.2 °C | 99.31 mm |
| August | 20 °C | 34.2 °C | 92.46 mm |
| September | 15.9 °C | 30.4 °C | 121.92 mm |
| October | 9.4 °C | 24.1 °C | 116.84 mm |
| November | 4 °C | 17.7 °C | 119.38 mm |
| December | -0.8 °C | 12.3 °C | 108.46 mm |
| Annual | 9.4 °C | 23 °C | 1340.87 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 |