Mammoth Spring, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.6 °F (low) to 69.4 °F (high). Annual precipitation averages 48.4 Inches. Mammoth Spring is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.3 °F | 46.2 °F | 3.16 in. |
| February | 27.7 °F | 51.0 °F | 3.44 in. |
| March | 35.7 °F | 60.3 °F | 4.59 in. |
| April | 44.9 °F | 70.8 °F | 5.38 in. |
| May | 54.7 °F | 77.8 °F | 5.36 in. |
| June | 63.2 °F | 85.9 °F | 3.53 in. |
| July | 66.9 °F | 89.7 °F | 3.8 in. |
| August | 65.5 °F | 89.3 °F | 3.6 in. |
| September | 57.1 °F | 82.2 °F | 3.69 in. |
| October | 44.9 °F | 71.8 °F | 3.77 in. |
| November | 35.1 °F | 59.3 °F | 4.61 in. |
| December | 27.7 °F | 48.8 °F | 3.51 in. |
| Annual | 45.6 °F | 69.4 °F | 48.44 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |