Brimfield, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.2 °C (low) to 14.5 °C (high). Annual precipitation averages 1251.5 Millimeters. Brimfield is located in USDA Plant Hardiness Zone 6a. 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 | -9.1 °C | 0.9 °C | 93.98 mm |
| February | -8.8 °C | 2.3 °C | 83.06 mm |
| March | -4.4 °C | 6.6 °C | 107.19 mm |
| April | 1.4 °C | 13.9 °C | 105.16 mm |
| May | 7.4 °C | 19.9 °C | 91.95 mm |
| June | 12.6 °C | 24.6 °C | 108.2 mm |
| July | 15.8 °C | 27.3 °C | 104.14 mm |
| August | 14.8 °C | 26.4 °C | 113.79 mm |
| September | 10.6 °C | 22.5 °C | 112.01 mm |
| October | 4.2 °C | 16.1 °C | 122.68 mm |
| November | -1 °C | 9.6 °C | 96.77 mm |
| December | -5.5 °C | 3.9 °C | 112.52 mm |
| Annual | 3.2 °C | 14.5 °C | 1251.45 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |