Kellyville, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.2 °C (low) to 22.2 °C (high). Annual precipitation averages 1065.5 Millimeters. Kellyville 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 | -3.2 °C | 9.7 °C | 43.94 mm |
| February | -1.3 °C | 12.1 °C | 51.31 mm |
| March | 3.7 °C | 17.2 °C | 76.71 mm |
| April | 8.7 °C | 22.1 °C | 117.6 mm |
| May | 14.3 °C | 26 °C | 142.24 mm |
| June | 19.3 °C | 30.8 °C | 131.57 mm |
| July | 21.4 °C | 33.8 °C | 97.28 mm |
| August | 20.5 °C | 33.8 °C | 87.63 mm |
| September | 15.9 °C | 29.4 °C | 95.5 mm |
| October | 9.2 °C | 23.5 °C | 94.49 mm |
| November | 3.2 °C | 16.8 °C | 72.39 mm |
| December | -1.6 °C | 10.8 °C | 54.86 mm |
| Annual | 9.2 °C | 22.2 °C | 1065.52 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 |