Wenham, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.4 °F (low) to 58.8 °F (high). Annual precipitation averages 48.1 Inches. 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 | 19.6 °F | 36.1 °F | 3.79 in. |
| February | 21.2 °F | 38.3 °F | 3.47 in. |
| March | 28.2 °F | 44.8 °F | 4.73 in. |
| April | 38.1 °F | 56.4 °F | 4.2 in. |
| May | 47.8 °F | 66.0 °F | 3.59 in. |
| June | 57.5 °F | 75.5 °F | 4.19 in. |
| July | 63.2 °F | 81.5 °F | 3.48 in. |
| August | 62.1 °F | 80.1 °F | 3.41 in. |
| September | 54.9 °F | 73.0 °F | 3.75 in. |
| October | 43.8 °F | 61.6 °F | 4.75 in. |
| November | 34.6 °F | 51.2 °F | 3.94 in. |
| December | 26.0 °F | 41.5 °F | 4.78 in. |
| Annual | 41.4 °F | 58.8 °F | 48.08 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |