Arnold Line, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.4 °C (low) to 25.2 °C (high). Annual precipitation averages 1559.8 Millimeters. 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 | 2.8 °C | 15.5 °C | 164.34 mm |
| February | 4.4 °C | 17.7 °C | 138.68 mm |
| March | 8 °C | 21.6 °C | 145.54 mm |
| April | 11.8 °C | 25.3 °C | 140.97 mm |
| May | 16.5 °C | 29.2 °C | 121.92 mm |
| June | 20.5 °C | 32.2 °C | 123.19 mm |
| July | 21.9 °C | 33.1 °C | 160.02 mm |
| August | 21.6 °C | 33.2 °C | 134.11 mm |
| September | 19 °C | 31.1 °C | 108.71 mm |
| October | 12.3 °C | 26.4 °C | 85.6 mm |
| November | 6.4 °C | 20.6 °C | 95.5 mm |
| December | 3.8 °C | 16.4 °C | 141.22 mm |
| Annual | 12.4 °C | 25.2 °C | 1559.8 mm |
| 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 : -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 |