Fairhaven, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.9 °C (low) to 15.5 °C (high). Annual precipitation averages 1312.9 Millimeters. Fairhaven is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °C | 3.8 °C | 113.54 mm |
| February | -3.9 °C | 4.4 °C | 96.77 mm |
| March | -0.8 °C | 7.5 °C | 142.24 mm |
| April | 4.3 °C | 13.2 °C | 115.06 mm |
| May | 9.6 °C | 18.7 °C | 91.44 mm |
| June | 14.9 °C | 24 °C | 99.82 mm |
| July | 18.7 °C | 27.6 °C | 84.07 mm |
| August | 17.9 °C | 27.1 °C | 99.06 mm |
| September | 14.6 °C | 23.4 °C | 101.85 mm |
| October | 8.9 °C | 17.4 °C | 119.38 mm |
| November | 3.8 °C | 11.8 °C | 116.59 mm |
| December | -0.8 °C | 7 °C | 133.1 mm |
| Annual | 6.9 °C | 15.5 °C | 1312.92 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |