Kingston, Rhode Island has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.5 °C (low) to 15.2 °C (high). Annual precipitation averages 1317.5 Millimeters. Kingston is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.8 °C | 3.2 °C | 106.68 mm |
| February | -5.2 °C | 4.1 °C | 94.74 mm |
| March | -1.9 °C | 7.9 °C | 139.95 mm |
| April | 3 °C | 13.7 °C | 122.94 mm |
| May | 8.4 °C | 19.2 °C | 94.23 mm |
| June | 13.6 °C | 24.3 °C | 102.36 mm |
| July | 16.8 °C | 26.8 °C | 82.8 mm |
| August | 16.4 °C | 26.2 °C | 103.63 mm |
| September | 13.3 °C | 22.8 °C | 104.14 mm |
| October | 7.7 °C | 16.7 °C | 124.97 mm |
| November | 2.4 °C | 11.2 °C | 111.51 mm |
| December | -2.2 °C | 6.2 °C | 129.54 mm |
| Annual | 5.5 °C | 15.2 °C | 1317.49 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |