Greenland, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.4 °F (low) to 58.2 °F (high). Annual precipitation averages 48.8 Inches. Greenland is located in USDA Plant Hardiness Zone 6a. 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 | 16.2 °F | 34.0 °F | 3.61 in. |
| February | 17.7 °F | 36.7 °F | 3.44 in. |
| March | 25.2 °F | 43.9 °F | 4.43 in. |
| April | 35.1 °F | 56.1 °F | 4.5 in. |
| May | 45.1 °F | 66.1 °F | 3.97 in. |
| June | 54.9 °F | 75.8 °F | 4.2 in. |
| July | 60.7 °F | 81.6 °F | 3.73 in. |
| August | 59.2 °F | 80.6 °F | 3.3 in. |
| September | 51.9 °F | 73.1 °F | 4.11 in. |
| October | 40.5 °F | 60.9 °F | 4.9 in. |
| November | 31.4 °F | 49.9 °F | 4.05 in. |
| December | 22.6 °F | 39.3 °F | 4.55 in. |
| Annual | 38.4 °F | 58.2 °F | 48.79 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |