Boston, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.8 °C (low) to 13.4 °C (high). Annual precipitation averages 1287 Millimeters. Boston is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.2 °C | -0.4 °C | 115.57 mm |
| February | -8.9 °C | 0.7 °C | 80.77 mm |
| March | -5.3 °C | 5.4 °C | 97.03 mm |
| April | 0.8 °C | 12.6 °C | 98.81 mm |
| May | 7.2 °C | 19.3 °C | 96.52 mm |
| June | 12.3 °C | 23.9 °C | 111.76 mm |
| July | 14.7 °C | 26.1 °C | 109.22 mm |
| August | 13.9 °C | 25.6 °C | 102.87 mm |
| September | 10.2 °C | 21.9 °C | 116.84 mm |
| October | 4.4 °C | 15.2 °C | 117.35 mm |
| November | -0.7 °C | 8.3 °C | 120.65 mm |
| December | -5.3 °C | 2.4 °C | 119.63 mm |
| Annual | 2.8 °C | 13.4 °C | 1287.02 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |