Smithfield, Rhode Island has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.7 °F (low) to 60 °F (high). Annual precipitation averages 51.8 Inches. Smithfield is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.0 °F | 36.6 °F | 3.87 in. |
| February | 20.3 °F | 38.9 °F | 3.48 in. |
| March | 27.4 °F | 46.3 °F | 4.94 in. |
| April | 37.5 °F | 58.3 °F | 4.66 in. |
| May | 47.5 °F | 68.8 °F | 3.68 in. |
| June | 56.7 °F | 77.0 °F | 4.31 in. |
| July | 62.9 °F | 82.6 °F | 3.82 in. |
| August | 61.3 °F | 81.1 °F | 4.25 in. |
| September | 54.2 °F | 74.0 °F | 4.04 in. |
| October | 42.9 °F | 62.6 °F | 5.3 in. |
| November | 33.3 °F | 51.8 °F | 4.33 in. |
| December | 24.9 °F | 41.7 °F | 5.08 in. |
| Annual | 40.7 °F | 60 °F | 51.76 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |