Lanesborough, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.7 °F (low) to 55.2 °F (high). Annual precipitation averages 52.1 Inches. 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 | 12.1 °F | 30.5 °F | 3.68 in. |
| February | 12.9 °F | 33.2 °F | 2.85 in. |
| March | 20.8 °F | 40.7 °F | 3.6 in. |
| April | 31.9 °F | 53.6 °F | 3.56 in. |
| May | 42.5 °F | 65.8 °F | 4.38 in. |
| June | 51.9 °F | 73.9 °F | 5.68 in. |
| July | 56.8 °F | 78.4 °F | 6.01 in. |
| August | 55.8 °F | 76.5 °F | 5.04 in. |
| September | 47.8 °F | 69.7 °F | 5.01 in. |
| October | 37.2 °F | 57.7 °F | 4.61 in. |
| November | 27.6 °F | 46.3 °F | 3.51 in. |
| December | 18.8 °F | 35.6 °F | 4.18 in. |
| Annual | 34.7 °F | 55.2 °F | 52.11 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |