West Wareham, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 15.5 °C (high). Annual precipitation averages 1297.9 Millimeters. West Wareham 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 | -6.2 °C | 3.4 °C | 108.71 mm |
| February | -5.5 °C | 4.4 °C | 93.47 mm |
| March | -1.9 °C | 7.8 °C | 139.19 mm |
| April | 3.2 °C | 13.6 °C | 115.06 mm |
| May | 8.7 °C | 19.2 °C | 92.71 mm |
| June | 13.8 °C | 24.2 °C | 97.54 mm |
| July | 17.5 °C | 27.6 °C | 83.57 mm |
| August | 16.7 °C | 26.9 °C | 93.73 mm |
| September | 12.8 °C | 23.2 °C | 107.19 mm |
| October | 6.7 °C | 17.1 °C | 124.71 mm |
| November | 1.6 °C | 11.6 °C | 112.27 mm |
| December | -2.9 °C | 6.5 °C | 129.79 mm |
| Annual | 5.4 °C | 15.5 °C | 1297.94 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 |