New Vernon, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.7 °C (low) to 16.7 °C (high). Annual precipitation averages 1280.9 Millimeters. New Vernon is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.1 °C | 3.3 °C | 96.27 mm |
| February | -5.4 °C | 4.8 °C | 74.68 mm |
| March | -1.4 °C | 9.4 °C | 111.76 mm |
| April | 4.5 °C | 16.3 °C | 103.63 mm |
| May | 9.9 °C | 21.8 °C | 104.65 mm |
| June | 15.1 °C | 26.7 °C | 123.95 mm |
| July | 17.8 °C | 29.5 °C | 120.14 mm |
| August | 16.9 °C | 28.4 °C | 118.36 mm |
| September | 12.8 °C | 24.7 °C | 110.24 mm |
| October | 6.3 °C | 18.1 °C | 112.52 mm |
| November | 1.1 °C | 11.8 °C | 92.2 mm |
| December | -2.9 °C | 6.1 °C | 112.52 mm |
| Annual | 5.7 °C | 16.7 °C | 1280.92 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |