West Greenwich, Rhode Island has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.1 °F (low) to 59.2 °F (high). Annual precipitation averages 50.3 Inches. West Greenwich 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.9 °F | 35.7 °F | 3.95 in. |
| February | 20.0 °F | 38.2 °F | 3.47 in. |
| March | 26.6 °F | 45.9 °F | 4.92 in. |
| April | 36.6 °F | 57.9 °F | 4.63 in. |
| May | 46.7 °F | 68.4 °F | 3.49 in. |
| June | 55.8 °F | 76.8 °F | 3.99 in. |
| July | 62.1 °F | 82.5 °F | 3.52 in. |
| August | 60.6 °F | 79.8 °F | 4.09 in. |
| September | 53.6 °F | 72.4 °F | 4.29 in. |
| October | 42.7 °F | 61.1 °F | 4.9 in. |
| November | 32.8 °F | 50.6 °F | 4.18 in. |
| December | 24.6 °F | 40.8 °F | 4.9 in. |
| Annual | 40.1 °F | 59.2 °F | 50.33 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |