Arnold Line, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.3 °F (low) to 77.3 °F (high). Annual precipitation averages 61.4 Inches. Arnold 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 37.0 °F | 59.9 °F | 6.47 in. |
| February | 40.0 °F | 63.9 °F | 5.46 in. |
| March | 46.4 °F | 70.9 °F | 5.73 in. |
| April | 53.2 °F | 77.5 °F | 5.55 in. |
| May | 61.7 °F | 84.5 °F | 4.8 in. |
| June | 68.9 °F | 89.9 °F | 4.85 in. |
| July | 71.4 °F | 91.5 °F | 6.3 in. |
| August | 70.9 °F | 91.7 °F | 5.28 in. |
| September | 66.2 °F | 88.0 °F | 4.28 in. |
| October | 54.1 °F | 79.5 °F | 3.37 in. |
| November | 43.5 °F | 69.1 °F | 3.76 in. |
| December | 38.8 °F | 61.6 °F | 5.56 in. |
| Annual | 54.3 °F | 77.3 °F | 61.41 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |