Northfield, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.9 °F (low) to 63.6 °F (high). Annual precipitation averages 47.4 Inches. Northfield is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.2 °F | 42.6 °F | 3.54 in. |
| February | 27.2 °F | 44.3 °F | 3.17 in. |
| March | 33.7 °F | 50.7 °F | 4.74 in. |
| April | 43.3 °F | 61.1 °F | 3.61 in. |
| May | 52.8 °F | 69.9 °F | 3.48 in. |
| June | 62.6 °F | 79.6 °F | 3.74 in. |
| July | 68.3 °F | 84.3 °F | 4.54 in. |
| August | 67.0 °F | 82.9 °F | 4.32 in. |
| September | 61.2 °F | 77.4 °F | 3.74 in. |
| October | 49.5 °F | 66.6 °F | 4.31 in. |
| November | 39.6 °F | 56.6 °F | 3.67 in. |
| December | 31.9 °F | 47.7 °F | 4.5 in. |
| Annual | 46.9 °F | 63.6 °F | 47.36 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |