Ashaway, Rhode Island has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.6 °C (low) to 15.5 °C (high). Annual precipitation averages 1242.6 Millimeters. Ashaway 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 | -6.1 °C | 3.6 °C | 101.09 mm |
| February | -5.3 °C | 4.5 °C | 88.39 mm |
| March | -1.4 °C | 8.1 °C | 128.52 mm |
| April | 3.7 °C | 13.8 °C | 116.84 mm |
| May | 9.1 °C | 19.2 °C | 89.66 mm |
| June | 14.3 °C | 24.2 °C | 97.03 mm |
| July | 17.7 °C | 27.2 °C | 80.01 mm |
| August | 16.8 °C | 26.6 °C | 96.52 mm |
| September | 12.9 °C | 23.2 °C | 97.54 mm |
| October | 6.9 °C | 17.3 °C | 119.89 mm |
| November | 1.5 °C | 11.7 °C | 104.14 mm |
| December | -2.8 °C | 6.6 °C | 122.94 mm |
| Annual | 5.6 °C | 15.5 °C | 1242.57 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |