Lewisboro, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.3 °C (low) to 16.1 °C (high). Annual precipitation averages 1273.6 Millimeters. Lewisboro is located in USDA Plant Hardiness Zone 6b. 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 | -6.8 °C | 2.6 °C | 97.79 mm |
| February | -5.8 °C | 4.2 °C | 69.34 mm |
| March | -1.9 °C | 8.5 °C | 101.09 mm |
| April | 3.8 °C | 15.8 °C | 101.09 mm |
| May | 9.2 °C | 21.6 °C | 91.95 mm |
| June | 14.4 °C | 26.1 °C | 109.98 mm |
| July | 17.4 °C | 28.9 °C | 115.82 mm |
| August | 16.7 °C | 27.8 °C | 128.78 mm |
| September | 12.6 °C | 23.9 °C | 120.4 mm |
| October | 6.3 °C | 17.4 °C | 124.71 mm |
| November | 1 °C | 11.2 °C | 107.19 mm |
| December | -3.3 °C | 5.3 °C | 105.41 mm |
| Annual | 5.3 °C | 16.1 °C | 1273.55 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |