Porterville, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.3 °C (low) to 24.2 °C (high). Annual precipitation averages 1447.5 Millimeters. Porterville 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 | 1.2 °C | 13.3 °C | 138.18 mm |
| February | 2.9 °C | 15.8 °C | 137.41 mm |
| March | 6.6 °C | 20.3 °C | 141.73 mm |
| April | 10.7 °C | 24.6 °C | 139.7 mm |
| May | 15.6 °C | 28.3 °C | 106.68 mm |
| June | 19.9 °C | 31.8 °C | 119.63 mm |
| July | 21.6 °C | 33.1 °C | 132.08 mm |
| August | 21.1 °C | 32.9 °C | 112.01 mm |
| September | 17.8 °C | 30.7 °C | 85.6 mm |
| October | 10.9 °C | 25.4 °C | 91.19 mm |
| November | 4.9 °C | 19.1 °C | 109.47 mm |
| December | 2.3 °C | 14.6 °C | 133.86 mm |
| Annual | 11.3 °C | 24.2 °C | 1447.54 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 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 |