Dumont, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.2 °F (low) to 62.8 °F (high). Annual precipitation averages 46.7 Inches. 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 | 23.6 °F | 39.0 °F | 3.48 in. |
| February | 25.4 °F | 41.6 °F | 2.71 in. |
| March | 32.2 °F | 49.3 °F | 4.0 in. |
| April | 42.5 °F | 61.7 °F | 3.99 in. |
| May | 52.4 °F | 71.4 °F | 3.49 in. |
| June | 61.7 °F | 80.7 °F | 4.5 in. |
| July | 67.2 °F | 85.6 °F | 4.21 in. |
| August | 65.6 °F | 83.7 °F | 4.51 in. |
| September | 58.3 °F | 77.0 °F | 4.14 in. |
| October | 46.7 °F | 65.2 °F | 4.17 in. |
| November | 37.0 °F | 54.2 °F | 3.46 in. |
| December | 29.6 °F | 44.1 °F | 4.05 in. |
| Annual | 45.2 °F | 62.8 °F | 46.71 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |