Cumberland, Rhode Island has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.8 °C (low) to 15.5 °C (high). Annual precipitation averages 1297.9 Millimeters. Cumberland 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 | -7.2 °C | 2.6 °C | 104.9 mm |
| February | -6.5 °C | 3.8 °C | 90.68 mm |
| March | -2.5 °C | 7.9 °C | 123.7 mm |
| April | 3.1 °C | 14.5 °C | 118.11 mm |
| May | 8.6 °C | 20.3 °C | 91.19 mm |
| June | 13.7 °C | 24.8 °C | 109.22 mm |
| July | 17.1 °C | 27.9 °C | 91.69 mm |
| August | 16.3 °C | 27.2 °C | 101.85 mm |
| September | 12.3 °C | 23.3 °C | 104.14 mm |
| October | 5.9 °C | 16.9 °C | 128.27 mm |
| November | 0.7 °C | 11 °C | 106.17 mm |
| December | -3.9 °C | 5.4 °C | 128.02 mm |
| Annual | 4.8 °C | 15.5 °C | 1297.94 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |