Blackgum, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.9 °F (low) to 70.8 °F (high). Annual precipitation averages 47.6 Inches. Blackgum 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 | 27.2 °F | 48.8 °F | 2.58 in. |
| February | 30.6 °F | 53.0 °F | 2.43 in. |
| March | 39.0 °F | 61.7 °F | 4.06 in. |
| April | 47.2 °F | 70.6 °F | 4.94 in. |
| May | 57.0 °F | 77.8 °F | 5.86 in. |
| June | 66.3 °F | 86.0 °F | 4.99 in. |
| July | 70.1 °F | 91.9 °F | 3.34 in. |
| August | 68.8 °F | 91.5 °F | 3.19 in. |
| September | 61.3 °F | 83.9 °F | 4.64 in. |
| October | 49.7 °F | 72.6 °F | 5.09 in. |
| November | 39.0 °F | 61.6 °F | 3.69 in. |
| December | 30.1 °F | 50.6 °F | 2.76 in. |
| Annual | 48.9 °F | 70.8 °F | 47.57 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |