Greentree, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8 °C (low) to 18.1 °C (high). Annual precipitation averages 1203.2 Millimeters. Greentree is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 5.1 °C | 91.95 mm |
| February | -2.8 °C | 6.6 °C | 71.63 mm |
| March | 0.9 °C | 10.9 °C | 114.81 mm |
| April | 6.5 °C | 17.7 °C | 88.65 mm |
| May | 11.8 °C | 22.9 °C | 98.3 mm |
| June | 17 °C | 28.1 °C | 107.19 mm |
| July | 20.1 °C | 30.4 °C | 121.67 mm |
| August | 19.2 °C | 29.4 °C | 123.44 mm |
| September | 15.4 °C | 25.8 °C | 101.6 mm |
| October | 8.9 °C | 19 °C | 98.04 mm |
| November | 3.3 °C | 13.2 °C | 79.25 mm |
| December | -0.8 °C | 7.7 °C | 106.68 mm |
| Annual | 8 °C | 18.1 °C | 1203.21 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |