Adams, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.6 °C (low) to 13.6 °C (high). Annual precipitation averages 1223.5 Millimeters. Adams is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.1 °C | -0.5 °C | 74.68 mm |
| February | -9.4 °C | 0.9 °C | 59.94 mm |
| March | -4.9 °C | 5.5 °C | 73.41 mm |
| April | 1.3 °C | 13.1 °C | 107.7 mm |
| May | 7.2 °C | 19.6 °C | 109.22 mm |
| June | 12.1 °C | 24.3 °C | 115.32 mm |
| July | 14.7 °C | 26.7 °C | 140.21 mm |
| August | 13.9 °C | 25.7 °C | 125.48 mm |
| September | 9.9 °C | 21.9 °C | 129.03 mm |
| October | 3.8 °C | 15.2 °C | 113.03 mm |
| November | -1.3 °C | 8.6 °C | 89.66 mm |
| December | -6.1 °C | 2.4 °C | 85.85 mm |
| Annual | 2.6 °C | 13.6 °C | 1223.53 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |