Sulphur Springs, Arkansas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11 °C (low) to 22.9 °C (high). Annual precipitation averages 1369.1 Millimeters. 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 | 0 °C | 11.2 °C | 106.68 mm |
| February | 1.7 °C | 13.8 °C | 114.05 mm |
| March | 5.7 °C | 18.4 °C | 133.6 mm |
| April | 10.4 °C | 23.1 °C | 146.81 mm |
| May | 15.9 °C | 27.3 °C | 127.76 mm |
| June | 20.2 °C | 31.4 °C | 91.19 mm |
| July | 22 °C | 33.1 °C | 93.98 mm |
| August | 21.2 °C | 32.8 °C | 87.38 mm |
| September | 17.3 °C | 29.8 °C | 91.44 mm |
| October | 10.6 °C | 24 °C | 116.84 mm |
| November | 5 °C | 17.7 °C | 113.79 mm |
| December | 1.4 °C | 12.7 °C | 145.54 mm |
| Annual | 11 °C | 22.9 °C | 1369.06 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |