Mangum, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.7 °C (low) to 23.6 °C (high). Annual precipitation averages 686.3 Millimeters. Mangum 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 Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 11.3 °C | 23.11 mm |
| February | -1.7 °C | 13.3 °C | 26.67 mm |
| March | 2.9 °C | 18.6 °C | 42.42 mm |
| April | 7.4 °C | 23.4 °C | 65.28 mm |
| May | 13.7 °C | 28.3 °C | 104.9 mm |
| June | 19.2 °C | 33.1 °C | 87.12 mm |
| July | 21.1 °C | 35.6 °C | 63.25 mm |
| August | 20.4 °C | 35.2 °C | 78.23 mm |
| September | 16.2 °C | 30.8 °C | 69.09 mm |
| October | 9.2 °C | 24.5 °C | 62.99 mm |
| November | 2.4 °C | 17.4 °C | 35.56 mm |
| December | -2.7 °C | 11.6 °C | 27.69 mm |
| Annual | 8.7 °C | 23.6 °C | 686.31 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 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 | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |