Millerton, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.7 °F (low) to 74.4 °F (high). Annual precipitation averages 51.5 Inches. Millerton is located in USDA Plant Hardiness Zone 8a. 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 | 30.7 °F | 53.8 °F | 3.32 in. |
| February | 34.4 °F | 58.0 °F | 3.67 in. |
| March | 41.4 °F | 65.8 °F | 4.52 in. |
| April | 48.8 °F | 73.5 °F | 4.86 in. |
| May | 58.6 °F | 80.8 °F | 6.13 in. |
| June | 67.3 °F | 88.9 °F | 4.13 in. |
| July | 70.4 °F | 93.3 °F | 3.52 in. |
| August | 69.2 °F | 93.8 °F | 3.31 in. |
| September | 62.7 °F | 87.3 °F | 4.23 in. |
| October | 50.7 °F | 76.6 °F | 4.82 in. |
| November | 40.7 °F | 65.1 °F | 4.3 in. |
| December | 33.1 °F | 55.7 °F | 4.72 in. |
| Annual | 50.7 °F | 74.4 °F | 51.53 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 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |