Wesson, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.1 °C (low) to 24.7 °C (high). Annual precipitation averages 1550.9 Millimeters. Wesson 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 | 14.7 °C | 152.4 mm |
| February | 4.2 °C | 17.1 °C | 148.34 mm |
| March | 7.7 °C | 21.1 °C | 146.81 mm |
| April | 11.4 °C | 24.8 °C | 139.7 mm |
| May | 16.2 °C | 28.6 °C | 114.05 mm |
| June | 20.2 °C | 31.8 °C | 125.22 mm |
| July | 21.4 °C | 32.8 °C | 141.48 mm |
| August | 21.1 °C | 33.1 °C | 129.29 mm |
| September | 18.1 °C | 30.8 °C | 102.62 mm |
| October | 11.7 °C | 26 °C | 94.74 mm |
| November | 6.7 °C | 20.1 °C | 114.55 mm |
| December | 3.8 °C | 15.8 °C | 141.73 mm |
| Annual | 12.1 °C | 24.7 °C | 1550.93 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 |