Marshfield, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 15.4 °C (high). Annual precipitation averages 1322.9 Millimeters. Marshfield is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.7 °C | 3.5 °C | 111.51 mm |
| February | -4.9 °C | 4.6 °C | 101.35 mm |
| March | -1.3 °C | 7.7 °C | 140.72 mm |
| April | 3.8 °C | 13.3 °C | 117.6 mm |
| May | 9.2 °C | 19 °C | 93.73 mm |
| June | 14.4 °C | 24.1 °C | 98.81 mm |
| July | 18 °C | 27.5 °C | 87.38 mm |
| August | 17.3 °C | 26.4 °C | 92.96 mm |
| September | 13.7 °C | 22.9 °C | 103.89 mm |
| October | 7.6 °C | 17.2 °C | 128.52 mm |
| November | 2.3 °C | 11.6 °C | 116.59 mm |
| December | -2.2 °C | 6.6 °C | 129.79 mm |
| Annual | 6 °C | 15.4 °C | 1322.85 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°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 |