Hammonton, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.9 °C (low) to 18.2 °C (high). Annual precipitation averages 1215.1 Millimeters. Hammonton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.5 °C | 5.6 °C | 92.46 mm |
| February | -3.8 °C | 6.9 °C | 73.91 mm |
| March | -0.1 °C | 11.1 °C | 115.82 mm |
| April | 5.4 °C | 17.6 °C | 89.15 mm |
| May | 10.8 °C | 22.7 °C | 90.42 mm |
| June | 15.9 °C | 27.8 °C | 105.41 mm |
| July | 18.9 °C | 30.2 °C | 123.19 mm |
| August | 17.9 °C | 29.2 °C | 120.9 mm |
| September | 14.2 °C | 25.8 °C | 106.17 mm |
| October | 7.5 °C | 19.3 °C | 103.89 mm |
| November | 1.9 °C | 13.5 °C | 83.82 mm |
| December | -1.8 °C | 8.3 °C | 109.98 mm |
| Annual | 6.9 °C | 18.2 °C | 1215.12 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |