Hancock, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.7 °C (low) to 13.6 °C (high). Annual precipitation averages 1268.5 Millimeters. Hancock is located in USDA Plant Hardiness Zone 5b. 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 | -11.1 °C | -0.7 °C | 92.96 mm |
| February | -10.3 °C | 1.1 °C | 85.85 mm |
| March | -6 °C | 5.4 °C | 103.89 mm |
| April | 0.2 °C | 13.1 °C | 99.57 mm |
| May | 6.2 °C | 19.3 °C | 100.33 mm |
| June | 11.5 °C | 24.2 °C | 114.05 mm |
| July | 14.3 °C | 26.9 °C | 106.68 mm |
| August | 13.3 °C | 26.1 °C | 105.66 mm |
| September | 9.1 °C | 22.1 °C | 107.95 mm |
| October | 3.1 °C | 14.8 °C | 134.11 mm |
| November | -2.1 °C | 8.3 °C | 101.85 mm |
| December | -7.3 °C | 2.3 °C | 115.57 mm |
| Annual | 1.7 °C | 13.6 °C | 1268.47 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |