Hopkinton, Rhode Island has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.8 °F (low) to 60 °F (high). Annual precipitation averages 49.5 Inches. Hopkinton 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 | 20.4 °F | 37.9 °F | 3.99 in. |
| February | 22.1 °F | 39.9 °F | 3.5 in. |
| March | 29.0 °F | 47.4 °F | 5.07 in. |
| April | 38.4 °F | 57.4 °F | 4.63 in. |
| May | 48.3 °F | 67.1 °F | 3.53 in. |
| June | 57.8 °F | 76.3 °F | 3.85 in. |
| July | 63.8 °F | 81.4 °F | 3.24 in. |
| August | 62.3 °F | 80.4 °F | 3.89 in. |
| September | 55.0 °F | 73.8 °F | 4.01 in. |
| October | 44.1 °F | 62.7 °F | 4.76 in. |
| November | 34.3 °F | 52.7 °F | 4.14 in. |
| December | 26.5 °F | 43.4 °F | 4.88 in. |
| Annual | 41.8 °F | 60 °F | 49.49 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 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |