Lanesborough, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.5 °C (low) to 12.9 °C (high). Annual precipitation averages 1323.6 Millimeters. Lanesborough is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.1 °C | -0.8 °C | 93.47 mm |
| February | -10.6 °C | 0.7 °C | 72.39 mm |
| March | -6.2 °C | 4.8 °C | 91.44 mm |
| April | -0.1 °C | 12 °C | 90.42 mm |
| May | 5.8 °C | 18.8 °C | 111.25 mm |
| June | 11.1 °C | 23.3 °C | 144.27 mm |
| July | 13.8 °C | 25.8 °C | 152.65 mm |
| August | 13.2 °C | 24.7 °C | 128.02 mm |
| September | 8.8 °C | 20.9 °C | 127.25 mm |
| October | 2.9 °C | 14.3 °C | 117.09 mm |
| November | -2.4 °C | 7.9 °C | 89.15 mm |
| December | -7.3 °C | 2 °C | 106.17 mm |
| Annual | 1.5 °C | 12.9 °C | 1323.57 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |