Gorham, New Hampshire has a Tundra Climate climate (Köppen classification: ET). Average annual temperatures range from 0.3 °C (low) to 12.4 °C (high). Annual precipitation averages 1052.8 Millimeters. 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 | -13.8 °C | -2.7 °C | 64.52 mm |
| February | -13.3 °C | -0.9 °C | 59.94 mm |
| March | -7.8 °C | 4 °C | 72.64 mm |
| April | -0.8 °C | 11.5 °C | 82.55 mm |
| May | 5.4 °C | 18.8 °C | 90.17 mm |
| June | 10.6 °C | 23.6 °C | 102.11 mm |
| July | 13.3 °C | 26.2 °C | 100.84 mm |
| August | 12.3 °C | 25.3 °C | 100.58 mm |
| September | 7.8 °C | 21.5 °C | 81.53 mm |
| October | 2.1 °C | 14 °C | 122.43 mm |
| November | -3.1 °C | 6.8 °C | 84.84 mm |
| December | -9.1 °C | 0.4 °C | 90.68 mm |
| Annual | 0.3 °C | 12.4 °C | 1052.83 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | ET - Tundra Climate |