Ballou, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.1 °C (low) to 21.5 °C (high). Annual precipitation averages 1169.4 Millimeters. Ballou 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 | -3.1 °C | 9 °C | 57.66 mm |
| February | -1.2 °C | 11.5 °C | 57.66 mm |
| March | 3.5 °C | 16.6 °C | 94.49 mm |
| April | 8.3 °C | 21.5 °C | 118.62 mm |
| May | 13.8 °C | 25.4 °C | 156.46 mm |
| June | 18.8 °C | 29.9 °C | 123.7 mm |
| July | 21.1 °C | 33 °C | 100.08 mm |
| August | 20.3 °C | 32.9 °C | 88.65 mm |
| September | 15.8 °C | 28.8 °C | 109.73 mm |
| October | 9.3 °C | 22.6 °C | 104.14 mm |
| November | 3.4 °C | 16.2 °C | 87.88 mm |
| December | -1.4 °C | 10.2 °C | 70.36 mm |
| Annual | 9.1 °C | 21.5 °C | 1169.43 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 |