New Ipswich, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 12.9 °C (high). Annual precipitation averages 1322.6 Millimeters. New Ipswich is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.7 °C | -1.2 °C | 97.28 mm |
| February | -10.1 °C | 0.7 °C | 90.17 mm |
| March | -5.9 °C | 4.8 °C | 113.54 mm |
| April | 0.3 °C | 12.2 °C | 110.24 mm |
| May | 6 °C | 18.6 °C | 101.6 mm |
| June | 11.3 °C | 23.3 °C | 116.59 mm |
| July | 14.4 °C | 26.1 °C | 111.76 mm |
| August | 13.2 °C | 25.2 °C | 105.16 mm |
| September | 9.3 °C | 21.3 °C | 111 mm |
| October | 3.5 °C | 14.1 °C | 135.64 mm |
| November | -1.8 °C | 7.7 °C | 108.71 mm |
| December | -6.9 °C | 1.8 °C | 120.9 mm |
| Annual | 1.9 °C | 12.9 °C | 1322.59 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |