Harperville, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11 °C (low) to 24.4 °C (high). Annual precipitation averages 1532.1 Millimeters. Harperville 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 | 1.3 °C | 13.8 °C | 147.07 mm |
| February | 2.9 °C | 16.3 °C | 150.62 mm |
| March | 6.6 °C | 20.6 °C | 146.3 mm |
| April | 10.4 °C | 24.6 °C | 159.77 mm |
| May | 15.2 °C | 28.4 °C | 112.78 mm |
| June | 19.4 °C | 31.9 °C | 110.24 mm |
| July | 20.9 °C | 33.1 °C | 139.7 mm |
| August | 20.4 °C | 33 °C | 114.55 mm |
| September | 17.3 °C | 30.8 °C | 92.71 mm |
| October | 10.7 °C | 25.7 °C | 97.54 mm |
| November | 5 °C | 19.4 °C | 120.65 mm |
| December | 2.4 °C | 15.1 °C | 140.21 mm |
| Annual | 11 °C | 24.4 °C | 1532.14 mm |
| 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 : -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 |