Exeter, Rhode Island has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.2 °C (low) to 15.3 °C (high). Annual precipitation averages 1289.5 Millimeters. 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 | -6.6 °C | 2.9 °C | 105.66 mm |
| February | -5.9 °C | 4 °C | 92.96 mm |
| March | -2.1 °C | 8.3 °C | 136.65 mm |
| April | 3.2 °C | 13.8 °C | 121.16 mm |
| May | 8.8 °C | 19.3 °C | 90.42 mm |
| June | 14.1 °C | 24.4 °C | 100.84 mm |
| July | 17.3 °C | 27.2 °C | 83.31 mm |
| August | 16.5 °C | 26.6 °C | 98.04 mm |
| September | 12.7 °C | 23.1 °C | 102.11 mm |
| October | 6.6 °C | 16.8 °C | 121.16 mm |
| November | 1.1 °C | 11.1 °C | 109.98 mm |
| December | -3.4 °C | 5.9 °C | 127.25 mm |
| Annual | 5.2 °C | 15.3 °C | 1289.54 mm |
| 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 : -20.6°C to -17.8°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 |