Greenville, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.3 °F (low) to 56.7 °F (high). Annual precipitation averages 51.7 Inches. Greenville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.5 °F | 31.5 °F | 3.78 in. |
| February | 14.8 °F | 34.5 °F | 3.49 in. |
| March | 22.5 °F | 42.2 °F | 4.48 in. |
| April | 33.4 °F | 55.5 °F | 4.33 in. |
| May | 44.1 °F | 66.7 °F | 4.04 in. |
| June | 53.4 °F | 75.5 °F | 4.49 in. |
| July | 58.9 °F | 80.6 °F | 4.34 in. |
| August | 57.1 °F | 78.9 °F | 4.06 in. |
| September | 49.7 °F | 71.9 °F | 4.27 in. |
| October | 38.5 °F | 59.0 °F | 5.38 in. |
| November | 29.2 °F | 47.6 °F | 4.3 in. |
| December | 20.0 °F | 36.9 °F | 4.72 in. |
| Annual | 36.3 °F | 56.7 °F | 51.68 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |