Exeter, Rhode Island has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.3 °F (low) to 59.5 °F (high). Annual precipitation averages 50.8 Inches. Exeter is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.1 °F | 37.3 °F | 4.16 in. |
| February | 21.3 °F | 39.2 °F | 3.66 in. |
| March | 28.3 °F | 46.9 °F | 5.38 in. |
| April | 37.7 °F | 56.9 °F | 4.77 in. |
| May | 47.8 °F | 66.7 °F | 3.56 in. |
| June | 57.4 °F | 75.9 °F | 3.97 in. |
| July | 63.2 °F | 81.0 °F | 3.28 in. |
| August | 61.7 °F | 79.9 °F | 3.86 in. |
| September | 54.8 °F | 73.5 °F | 4.02 in. |
| October | 43.8 °F | 62.2 °F | 4.77 in. |
| November | 33.9 °F | 52.0 °F | 4.33 in. |
| December | 25.9 °F | 42.7 °F | 5.01 in. |
| Annual | 41.3 °F | 59.5 °F | 50.77 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |