Porterville, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.3 °F (low) to 75.5 °F (high). Annual precipitation averages 57 Inches. 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 | 34.1 °F | 56.0 °F | 5.44 in. |
| February | 37.3 °F | 60.5 °F | 5.41 in. |
| March | 43.8 °F | 68.6 °F | 5.58 in. |
| April | 51.3 °F | 76.2 °F | 5.5 in. |
| May | 60.1 °F | 83.0 °F | 4.2 in. |
| June | 67.9 °F | 89.2 °F | 4.71 in. |
| July | 70.8 °F | 91.5 °F | 5.2 in. |
| August | 69.9 °F | 91.3 °F | 4.41 in. |
| September | 64.0 °F | 87.2 °F | 3.37 in. |
| October | 51.6 °F | 77.7 °F | 3.59 in. |
| November | 40.9 °F | 66.3 °F | 4.31 in. |
| December | 36.2 °F | 58.3 °F | 5.27 in. |
| Annual | 52.3 °F | 75.5 °F | 56.99 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |