Quonochontaug, Rhode Island has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 7.2 °C (low) to 14.8 °C (high). Annual precipitation averages 1211.8 Millimeters. Quonochontaug is located in USDA Plant Hardiness Zone 7a. 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 | -4.2 °C | 3.7 °C | 101.6 mm |
| February | -3.6 °C | 4.4 °C | 89.66 mm |
| March | -0.3 °C | 7.5 °C | 129.54 mm |
| April | 4.7 °C | 12.4 °C | 114.55 mm |
| May | 9.6 °C | 17.4 °C | 86.36 mm |
| June | 14.9 °C | 22.4 °C | 92.46 mm |
| July | 18.5 °C | 25.9 °C | 74.68 mm |
| August | 18.3 °C | 25.4 °C | 91.44 mm |
| September | 15.1 °C | 22.5 °C | 89.41 mm |
| October | 9.4 °C | 17.1 °C | 117.09 mm |
| November | 3.9 °C | 11.8 °C | 103.38 mm |
| December | -0.4 °C | 6.9 °C | 121.67 mm |
| Annual | 7.2 °C | 14.8 °C | 1211.84 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |