Haddonfield, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 8.5 °C (low) to 18.4 °C (high). Annual precipitation averages 1201.2 Millimeters. Haddonfield 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 | -3.1 °C | 5.3 °C | 90.42 mm |
| February | -2.3 °C | 7.1 °C | 70.87 mm |
| March | 1.4 °C | 11.6 °C | 113.79 mm |
| April | 7 °C | 18.1 °C | 89.15 mm |
| May | 12.3 °C | 23.4 °C | 98.81 mm |
| June | 17.6 °C | 28.4 °C | 107.95 mm |
| July | 20.7 °C | 30.9 °C | 120.14 mm |
| August | 19.7 °C | 29.7 °C | 124.46 mm |
| September | 16 °C | 25.9 °C | 102.62 mm |
| October | 9.5 °C | 19.3 °C | 97.54 mm |
| November | 3.9 °C | 13.3 °C | 78.74 mm |
| December | -0.2 °C | 7.9 °C | 106.68 mm |
| Annual | 8.5 °C | 18.4 °C | 1201.17 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 |