Whippany, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.8 °C (low) to 17.1 °C (high). Annual precipitation averages 1250.4 Millimeters. Whippany 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 | -5.9 °C | 3.7 °C | 93.47 mm |
| February | -5.2 °C | 5.1 °C | 70.87 mm |
| March | -1.2 °C | 9.7 °C | 106.17 mm |
| April | 4.6 °C | 16.5 °C | 102.62 mm |
| May | 10.1 °C | 22.1 °C | 103.89 mm |
| June | 15.2 °C | 27 °C | 122.68 mm |
| July | 18 °C | 29.8 °C | 113.79 mm |
| August | 16.9 °C | 28.8 °C | 115.82 mm |
| September | 13 °C | 25.1 °C | 109.47 mm |
| October | 6.3 °C | 18.3 °C | 112.52 mm |
| November | 1.1 °C | 12.1 °C | 90.68 mm |
| December | -2.8 °C | 6.4 °C | 108.46 mm |
| Annual | 5.8 °C | 17.1 °C | 1250.44 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |