Kellyville, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.5 °F (low) to 71.9 °F (high). Annual precipitation averages 42 Inches. 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 | 26.2 °F | 49.5 °F | 1.73 in. |
| February | 29.6 °F | 53.8 °F | 2.02 in. |
| March | 38.6 °F | 62.9 °F | 3.02 in. |
| April | 47.6 °F | 71.8 °F | 4.63 in. |
| May | 57.7 °F | 78.8 °F | 5.6 in. |
| June | 66.7 °F | 87.4 °F | 5.18 in. |
| July | 70.6 °F | 92.8 °F | 3.83 in. |
| August | 68.9 °F | 92.8 °F | 3.45 in. |
| September | 60.6 °F | 85.0 °F | 3.76 in. |
| October | 48.5 °F | 74.3 °F | 3.72 in. |
| November | 37.8 °F | 62.2 °F | 2.85 in. |
| December | 29.1 °F | 51.4 °F | 2.16 in. |
| Annual | 48.5 °F | 71.9 °F | 41.95 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |