Fieldsboro, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.3 °C (low) to 18 °C (high). Annual precipitation averages 1199.4 Millimeters. Fieldsboro 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 | -4.2 °C | 4.9 °C | 89.41 mm |
| February | -3.5 °C | 6.4 °C | 68.33 mm |
| March | 0.3 °C | 10.7 °C | 110.24 mm |
| April | 5.8 °C | 17.4 °C | 88.65 mm |
| May | 11.2 °C | 22.7 °C | 99.82 mm |
| June | 16.4 °C | 27.8 °C | 109.98 mm |
| July | 19.4 °C | 30.3 °C | 124.46 mm |
| August | 18.6 °C | 29.4 °C | 119.13 mm |
| September | 14.6 °C | 25.8 °C | 100.58 mm |
| October | 8.1 °C | 19.2 °C | 98.3 mm |
| November | 2.5 °C | 13.3 °C | 82.3 mm |
| December | -1.4 °C | 7.6 °C | 108.2 mm |
| Annual | 7.3 °C | 18 °C | 1199.4 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |