South Amboy, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.5 °C (low) to 17.6 °C (high). Annual precipitation averages 1227.6 Millimeters. South Amboy is located in USDA Plant Hardiness Zone 7b. 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 | 4.6 °C | 91.69 mm |
| February | -3.4 °C | 6.1 °C | 71.88 mm |
| March | 0.4 °C | 10.3 °C | 106.93 mm |
| April | 5.8 °C | 16.9 °C | 98.55 mm |
| May | 11.2 °C | 22.3 °C | 100.08 mm |
| June | 16.3 °C | 27.3 °C | 115.06 mm |
| July | 19.5 °C | 30.1 °C | 121.92 mm |
| August | 18.6 °C | 29 °C | 114.55 mm |
| September | 14.8 °C | 25.3 °C | 107.44 mm |
| October | 8.6 °C | 18.8 °C | 106.17 mm |
| November | 3.1 °C | 13.1 °C | 85.6 mm |
| December | -1.2 °C | 7.4 °C | 107.7 mm |
| Annual | 7.5 °C | 17.6 °C | 1227.57 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 7b : -15°C to -12.2°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 |