Gloucester, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.2 °C (low) to 14 °C (high). Annual precipitation averages 1265.7 Millimeters. Gloucester 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.3 °C | 2.5 °C | 106.68 mm |
| February | -4.7 °C | 3.4 °C | 100.84 mm |
| March | -1.2 °C | 6.5 °C | 130.56 mm |
| April | 3.9 °C | 12.2 °C | 110.74 mm |
| May | 9.1 °C | 17.5 °C | 96.52 mm |
| June | 14.2 °C | 22.6 °C | 103.63 mm |
| July | 17.7 °C | 25.6 °C | 88.9 mm |
| August | 17.2 °C | 25.1 °C | 84.33 mm |
| September | 13.8 °C | 21.3 °C | 95.25 mm |
| October | 8.2 °C | 15.8 °C | 121.41 mm |
| November | 2.9 °C | 10.4 °C | 100.58 mm |
| December | -1.9 °C | 5.6 °C | 126.24 mm |
| Annual | 6.2 °C | 14 °C | 1265.68 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 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 |