Sumrall, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.4 °C (low) to 25.1 °C (high). Annual precipitation averages 1547.4 Millimeters. Sumrall is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.8 °C | 15.3 °C | 158.5 mm |
| February | 4.6 °C | 17.6 °C | 133.35 mm |
| March | 8.1 °C | 21.5 °C | 151.38 mm |
| April | 11.8 °C | 25.2 °C | 131.57 mm |
| May | 16.4 °C | 29 °C | 111 mm |
| June | 20.4 °C | 32.1 °C | 137.67 mm |
| July | 21.8 °C | 33.1 °C | 145.29 mm |
| August | 21.4 °C | 33.1 °C | 138.68 mm |
| September | 18.9 °C | 30.9 °C | 108.71 mm |
| October | 12.3 °C | 26.2 °C | 84.33 mm |
| November | 6.6 °C | 20.4 °C | 102.36 mm |
| December | 3.9 °C | 16.3 °C | 144.53 mm |
| Annual | 12.4 °C | 25.1 °C | 1547.37 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |