Newfield, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.3 °C (low) to 18.2 °C (high). Annual precipitation averages 1217.9 Millimeters. Newfield 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °C | 5.6 °C | 93.47 mm |
| February | -3.5 °C | 6.8 °C | 77.22 mm |
| March | 0.3 °C | 11.1 °C | 114.81 mm |
| April | 5.9 °C | 17.7 °C | 88.65 mm |
| May | 11.2 °C | 23.1 °C | 91.19 mm |
| June | 16.4 °C | 28 °C | 109.98 mm |
| July | 19.4 °C | 30.4 °C | 124.46 mm |
| August | 18.4 °C | 29.3 °C | 124.97 mm |
| September | 14.7 °C | 25.9 °C | 104.9 mm |
| October | 8 °C | 19.4 °C | 99.31 mm |
| November | 2.4 °C | 13.4 °C | 80.52 mm |
| December | -1.5 °C | 8.2 °C | 108.46 mm |
| Annual | 7.3 °C | 18.2 °C | 1217.94 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |