Wenham, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.2 °C (low) to 14.9 °C (high). Annual precipitation averages 1221.2 Millimeters. Wenham is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.9 °C | 2.3 °C | 96.27 mm |
| February | -6 °C | 3.5 °C | 88.14 mm |
| March | -2.1 °C | 7.1 °C | 120.14 mm |
| April | 3.4 °C | 13.6 °C | 106.68 mm |
| May | 8.8 °C | 18.9 °C | 91.19 mm |
| June | 14.2 °C | 24.2 °C | 106.43 mm |
| July | 17.3 °C | 27.5 °C | 88.39 mm |
| August | 16.7 °C | 26.7 °C | 86.61 mm |
| September | 12.7 °C | 22.8 °C | 95.25 mm |
| October | 6.6 °C | 16.4 °C | 120.65 mm |
| November | 1.4 °C | 10.7 °C | 100.08 mm |
| December | -3.3 °C | 5.3 °C | 121.41 mm |
| Annual | 5.2 °C | 14.9 °C | 1221.24 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |