Whippany, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 42.5 °F (low) to 62.7 °F (high). Annual precipitation averages 49.2 Inches. 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 | 21.4 °F | 38.6 °F | 3.68 in. |
| February | 22.6 °F | 41.1 °F | 2.79 in. |
| March | 29.8 °F | 49.4 °F | 4.18 in. |
| April | 40.3 °F | 61.7 °F | 4.04 in. |
| May | 50.1 °F | 71.8 °F | 4.09 in. |
| June | 59.3 °F | 80.6 °F | 4.83 in. |
| July | 64.4 °F | 85.7 °F | 4.48 in. |
| August | 62.5 °F | 83.9 °F | 4.56 in. |
| September | 55.4 °F | 77.1 °F | 4.31 in. |
| October | 43.4 °F | 65.0 °F | 4.43 in. |
| November | 34.0 °F | 53.7 °F | 3.57 in. |
| December | 27.0 °F | 43.5 °F | 4.27 in. |
| Annual | 42.5 °F | 62.7 °F | 49.23 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |