Perth Amboy, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.8 °C (low) to 17.7 °C (high). Annual precipitation averages 1223.8 Millimeters. Perth Amboy 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4 °C | 4.6 °C | 90.68 mm |
| February | -3.1 °C | 6.1 °C | 71.63 mm |
| March | 0.7 °C | 10.4 °C | 106.43 mm |
| April | 6.1 °C | 17.1 °C | 98.81 mm |
| May | 11.6 °C | 22.5 °C | 99.31 mm |
| June | 16.7 °C | 27.5 °C | 115.57 mm |
| July | 19.8 °C | 30.2 °C | 122.68 mm |
| August | 18.9 °C | 29.3 °C | 114.05 mm |
| September | 15.3 °C | 25.5 °C | 107.44 mm |
| October | 8.8 °C | 18.9 °C | 106.17 mm |
| November | 3.4 °C | 13 °C | 85.09 mm |
| December | -0.8 °C | 7.5 °C | 105.92 mm |
| Annual | 7.8 °C | 17.7 °C | 1223.78 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |