Ipswich, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 14.8 °C (high). Annual precipitation averages 1259.1 Millimeters. Ipswich is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.6 °C | 2 °C | 99.06 mm |
| February | -6.7 °C | 3.3 °C | 94.74 mm |
| March | -2.7 °C | 7 °C | 126.24 mm |
| April | 2.6 °C | 13.5 °C | 109.22 mm |
| May | 8.1 °C | 18.8 °C | 93.47 mm |
| June | 13.5 °C | 24 °C | 111 mm |
| July | 16.7 °C | 27.4 °C | 90.42 mm |
| August | 16.1 °C | 26.7 °C | 86.11 mm |
| September | 12.1 °C | 22.7 °C | 97.54 mm |
| October | 5.8 °C | 16.3 °C | 122.17 mm |
| November | 0.7 °C | 10.4 °C | 102.87 mm |
| December | -3.9 °C | 5.1 °C | 126.24 mm |
| Annual | 4.6 °C | 14.8 °C | 1259.08 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |