Greenwood Lake, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.5 °C (low) to 16.1 °C (high). Annual precipitation averages 1263.1 Millimeters. Greenwood Lake is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.5 °C | 2.3 °C | 91.19 mm |
| February | -6.9 °C | 4.1 °C | 69.85 mm |
| March | -2.7 °C | 8.4 °C | 111.51 mm |
| April | 3.4 °C | 15.8 °C | 98.04 mm |
| May | 8.7 °C | 21.7 °C | 96.52 mm |
| June | 13.9 °C | 26.3 °C | 122.68 mm |
| July | 16.4 °C | 29.1 °C | 108.71 mm |
| August | 15.6 °C | 28 °C | 125.22 mm |
| September | 11.6 °C | 24.3 °C | 119.89 mm |
| October | 5.4 °C | 17.5 °C | 112.78 mm |
| November | 0.1 °C | 11.1 °C | 97.28 mm |
| December | -4.1 °C | 5.1 °C | 109.47 mm |
| Annual | 4.5 °C | 16.1 °C | 1263.14 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |