Smithfield, North Carolina has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.1 °F (low) to 72.2 °F (high). Annual precipitation averages 48.9 Inches. Smithfield is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.0 °F | 52.6 °F | 3.53 in. |
| February | 32.9 °F | 56.3 °F | 3.02 in. |
| March | 39.3 °F | 63.7 °F | 4.0 in. |
| April | 48.5 °F | 72.9 °F | 3.49 in. |
| May | 57.9 °F | 79.8 °F | 3.96 in. |
| June | 66.5 °F | 86.9 °F | 4.5 in. |
| July | 70.4 °F | 90.1 °F | 5.68 in. |
| August | 68.6 °F | 88.3 °F | 5.15 in. |
| September | 63.0 °F | 82.8 °F | 5.7 in. |
| October | 50.1 °F | 73.5 °F | 3.3 in. |
| November | 39.1 °F | 63.6 °F | 3.25 in. |
| December | 33.8 °F | 55.6 °F | 3.27 in. |
| Annual | 50.1 °F | 72.2 °F | 48.85 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |