Haileyville, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.3 °F (low) to 73.1 °F (high). Annual precipitation averages 46.5 Inches. Haileyville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.8 °F | 51.3 °F | 2.61 in. |
| February | 32.6 °F | 55.5 °F | 2.55 in. |
| March | 40.8 °F | 64.3 °F | 3.83 in. |
| April | 49.0 °F | 72.8 °F | 4.73 in. |
| May | 59.0 °F | 79.6 °F | 5.97 in. |
| June | 67.6 °F | 88.0 °F | 4.63 in. |
| July | 71.2 °F | 93.3 °F | 3.62 in. |
| August | 69.7 °F | 93.5 °F | 3.12 in. |
| September | 62.1 °F | 86.4 °F | 4.22 in. |
| October | 50.8 °F | 75.3 °F | 4.21 in. |
| November | 40.3 °F | 63.6 °F | 3.62 in. |
| December | 31.7 °F | 53.7 °F | 3.38 in. |
| Annual | 50.3 °F | 73.1 °F | 46.49 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |