Mendenhall, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.7 °C (low) to 24.7 °C (high). Annual precipitation averages 1481.1 Millimeters. Mendenhall 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 | 1.9 °C | 14.4 °C | 146.3 mm |
| February | 3.4 °C | 16.8 °C | 140.72 mm |
| March | 7.1 °C | 20.9 °C | 143.76 mm |
| April | 11.2 °C | 24.8 °C | 142.24 mm |
| May | 16 °C | 28.6 °C | 98.04 mm |
| June | 20.1 °C | 32 °C | 119.63 mm |
| July | 21.4 °C | 33.2 °C | 135.89 mm |
| August | 21.1 °C | 33.1 °C | 121.16 mm |
| September | 17.9 °C | 30.8 °C | 95 mm |
| October | 11.3 °C | 25.8 °C | 79.25 mm |
| November | 5.8 °C | 19.8 °C | 116.59 mm |
| December | 3.1 °C | 15.6 °C | 142.49 mm |
| Annual | 11.7 °C | 24.7 °C | 1481.07 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 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |