Gorham, New Hampshire has a Tundra Climate climate (Köppen classification: ET). Average annual temperatures range from 32.5 °F (low) to 54.3 °F (high). Annual precipitation averages 41.5 Inches. Gorham is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.1 °F | 27.2 °F | 2.54 in. |
| February | 8.0 °F | 30.4 °F | 2.36 in. |
| March | 17.9 °F | 39.2 °F | 2.86 in. |
| April | 30.6 °F | 52.7 °F | 3.25 in. |
| May | 41.8 °F | 65.9 °F | 3.55 in. |
| June | 51.0 °F | 74.4 °F | 4.02 in. |
| July | 55.9 °F | 79.2 °F | 3.97 in. |
| August | 54.2 °F | 77.6 °F | 3.96 in. |
| September | 46.0 °F | 70.7 °F | 3.21 in. |
| October | 35.7 °F | 57.2 °F | 4.82 in. |
| November | 26.4 °F | 44.2 °F | 3.34 in. |
| December | 15.6 °F | 32.7 °F | 3.57 in. |
| Annual | 32.5 °F | 54.3 °F | 41.45 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | ET - Tundra Climate |