Brockton, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.8 °C (low) to 15.9 °C (high). Annual precipitation averages 1286.8 Millimeters. Brockton 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7 °C | 3 °C | 106.43 mm |
| February | -6.4 °C | 4.2 °C | 91.69 mm |
| March | -2.3 °C | 8.1 °C | 133.35 mm |
| April | 3.1 °C | 14.6 °C | 117.6 mm |
| May | 8.4 °C | 20.3 °C | 90.17 mm |
| June | 13.7 °C | 25.3 °C | 99.82 mm |
| July | 17.1 °C | 28.5 °C | 87.38 mm |
| August | 16.2 °C | 27.8 °C | 93.73 mm |
| September | 12.2 °C | 23.8 °C | 99.31 mm |
| October | 5.9 °C | 17.3 °C | 128.27 mm |
| November | 0.8 °C | 11.4 °C | 111.76 mm |
| December | -3.8 °C | 5.9 °C | 127.25 mm |
| Annual | 4.8 °C | 15.9 °C | 1286.76 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 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 | Dfb - Humid Continental Mild Summer, Wet All Year |