Milburn, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.7 °F (low) to 73.8 °F (high). Annual precipitation averages 42.8 Inches. Milburn 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 29.4 °F | 52.4 °F | 2.19 in. |
| February | 33.2 °F | 56.8 °F | 2.37 in. |
| March | 41.3 °F | 64.9 °F | 3.68 in. |
| April | 49.2 °F | 73.1 °F | 4.04 in. |
| May | 59.4 °F | 80.2 °F | 5.88 in. |
| June | 68.0 °F | 88.6 °F | 4.65 in. |
| July | 71.7 °F | 93.9 °F | 2.94 in. |
| August | 70.3 °F | 94.2 °F | 2.48 in. |
| September | 62.9 °F | 86.8 °F | 4.15 in. |
| October | 50.8 °F | 75.8 °F | 4.5 in. |
| November | 40.4 °F | 64.5 °F | 2.91 in. |
| December | 31.6 °F | 54.2 °F | 3.03 in. |
| Annual | 50.7 °F | 73.8 °F | 42.82 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |