State Line, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.7 °F (low) to 77 °F (high). Annual precipitation averages 60.8 Inches. State Line is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.9 °F | 59.2 °F | 6.27 in. |
| February | 39.4 °F | 63.8 °F | 5.26 in. |
| March | 45.5 °F | 71.1 °F | 5.61 in. |
| April | 52.3 °F | 77.5 °F | 4.51 in. |
| May | 61.0 °F | 84.3 °F | 4.44 in. |
| June | 68.2 °F | 89.6 °F | 6.02 in. |
| July | 70.6 °F | 91.6 °F | 5.53 in. |
| August | 70.6 °F | 91.3 °F | 5.36 in. |
| September | 65.6 °F | 87.3 °F | 4.36 in. |
| October | 53.6 °F | 78.5 °F | 3.14 in. |
| November | 43.3 °F | 68.7 °F | 4.61 in. |
| December | 38.2 °F | 61.4 °F | 5.69 in. |
| Annual | 53.7 °F | 77 °F | 60.8 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |