Groveton, New Hampshire has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -0.9 °C (low) to 12.1 °C (high). Annual precipitation averages 1025.9 Millimeters. Groveton is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.9 °C | -3.6 °C | 58.42 mm |
| February | -15.4 °C | -1.5 °C | 52.58 mm |
| March | -9.5 °C | 3.7 °C | 57.15 mm |
| April | -1.8 °C | 11.4 °C | 81.53 mm |
| May | 4.5 °C | 19.2 °C | 95.25 mm |
| June | 9.7 °C | 23.8 °C | 114.55 mm |
| July | 12.4 °C | 26.4 °C | 111 mm |
| August | 11.4 °C | 25.6 °C | 108.71 mm |
| September | 7.2 °C | 21.4 °C | 88.14 mm |
| October | 1.2 °C | 13.6 °C | 107.7 mm |
| November | -4.1 °C | 6.1 °C | 71.12 mm |
| December | -10.7 °C | -0.4 °C | 79.76 mm |
| Annual | -0.9 °C | 12.1 °C | 1025.91 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |