Mullica Hill, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.1 °C (low) to 17.9 °C (high). Annual precipitation averages 1198.9 Millimeters. Mullica Hill 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 | -3.5 °C | 5 °C | 94.23 mm |
| February | -2.7 °C | 6.3 °C | 73.91 mm |
| March | 0.9 °C | 10.7 °C | 113.28 mm |
| April | 6.7 °C | 17.4 °C | 90.93 mm |
| May | 12 °C | 22.8 °C | 94.49 mm |
| June | 17.2 °C | 27.9 °C | 109.47 mm |
| July | 20.3 °C | 30.3 °C | 118.87 mm |
| August | 19.4 °C | 29.2 °C | 116.08 mm |
| September | 15.7 °C | 25.7 °C | 103.89 mm |
| October | 9 °C | 19.1 °C | 99.57 mm |
| November | 3.4 °C | 13.1 °C | 77.22 mm |
| December | -0.7 °C | 7.7 °C | 106.93 mm |
| Annual | 8.1 °C | 17.9 °C | 1198.87 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |