Dumont, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.3 °C (low) to 17.1 °C (high). Annual precipitation averages 1186.4 Millimeters. Dumont is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.7 °C | 3.9 °C | 88.39 mm |
| February | -3.7 °C | 5.3 °C | 68.83 mm |
| March | 0.1 °C | 9.6 °C | 101.6 mm |
| April | 5.8 °C | 16.5 °C | 101.35 mm |
| May | 11.3 °C | 21.9 °C | 88.65 mm |
| June | 16.5 °C | 27.1 °C | 114.3 mm |
| July | 19.6 °C | 29.8 °C | 106.93 mm |
| August | 18.7 °C | 28.7 °C | 114.55 mm |
| September | 14.6 °C | 25 °C | 105.16 mm |
| October | 8.2 °C | 18.4 °C | 105.92 mm |
| November | 2.8 °C | 12.3 °C | 87.88 mm |
| December | -1.3 °C | 6.7 °C | 102.87 mm |
| Annual | 7.3 °C | 17.1 °C | 1186.43 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 |