Mountainburg, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.6 °F (low) to 71.4 °F (high). Annual precipitation averages 54.1 Inches. Mountainburg 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.9 °F | 49.1 °F | 3.71 in. |
| February | 31.2 °F | 53.9 °F | 2.94 in. |
| March | 38.9 °F | 62.1 °F | 4.53 in. |
| April | 47.5 °F | 72.0 °F | 5.14 in. |
| May | 56.9 °F | 79.1 °F | 6.11 in. |
| June | 65.3 °F | 86.9 °F | 4.48 in. |
| July | 69.0 °F | 91.7 °F | 4.12 in. |
| August | 67.8 °F | 91.6 °F | 3.85 in. |
| September | 60.5 °F | 84.3 °F | 4.98 in. |
| October | 48.8 °F | 73.6 °F | 4.9 in. |
| November | 38.6 °F | 61.1 °F | 5.44 in. |
| December | 30.7 °F | 51.3 °F | 3.87 in. |
| Annual | 48.6 °F | 71.4 °F | 54.07 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |