Sutton, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 12.9 °C (high). Annual precipitation averages 1256 Millimeters. Sutton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11 °C | -1.5 °C | 85.85 mm |
| February | -10.2 °C | 0.2 °C | 78.49 mm |
| March | -5.9 °C | 4.8 °C | 95.5 mm |
| April | 0.4 °C | 12.2 °C | 100.84 mm |
| May | 6.6 °C | 18.9 °C | 99.82 mm |
| June | 12.1 °C | 23.7 °C | 117.09 mm |
| July | 15 °C | 26.3 °C | 115.06 mm |
| August | 13.8 °C | 25.4 °C | 106.17 mm |
| September | 9.7 °C | 21.5 °C | 103.89 mm |
| October | 3.8 °C | 14.2 °C | 136.91 mm |
| November | -1.7 °C | 7.7 °C | 101.35 mm |
| December | -6.8 °C | 1.6 °C | 115.06 mm |
| Annual | 2.2 °C | 12.9 °C | 1256.03 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |