Sulphur Springs, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.7 °F (low) to 73.3 °F (high). Annual precipitation averages 53.9 Inches. Sulphur Springs is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.0 °F | 52.1 °F | 4.2 in. |
| February | 35.1 °F | 56.8 °F | 4.49 in. |
| March | 42.3 °F | 65.2 °F | 5.26 in. |
| April | 50.8 °F | 73.5 °F | 5.78 in. |
| May | 60.6 °F | 81.1 °F | 5.03 in. |
| June | 68.4 °F | 88.5 °F | 3.59 in. |
| July | 71.6 °F | 91.5 °F | 3.7 in. |
| August | 70.2 °F | 91.0 °F | 3.44 in. |
| September | 63.1 °F | 85.6 °F | 3.6 in. |
| October | 51.1 °F | 75.2 °F | 4.6 in. |
| November | 41.0 °F | 63.8 °F | 4.48 in. |
| December | 34.6 °F | 54.9 °F | 5.73 in. |
| Annual | 51.7 °F | 73.3 °F | 53.9 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |