Chester, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.6 °C (low) to 15.6 °C (high). Annual precipitation averages 1339.9 Millimeters. Chester is located in USDA Plant Hardiness Zone 6b. 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 | -6.4 °C | 2.3 °C | 98.3 mm |
| February | -5.9 °C | 3.6 °C | 77.72 mm |
| March | -1.9 °C | 8.2 °C | 109.73 mm |
| April | 4.3 °C | 15.3 °C | 105.41 mm |
| May | 9.7 °C | 20.8 °C | 106.43 mm |
| June | 15.3 °C | 25.4 °C | 135.13 mm |
| July | 17.5 °C | 28.2 °C | 122.68 mm |
| August | 16.8 °C | 27.2 °C | 125.48 mm |
| September | 12.9 °C | 23.3 °C | 124.46 mm |
| October | 6.6 °C | 16.9 °C | 121.16 mm |
| November | 1.2 °C | 10.7 °C | 95.5 mm |
| December | -2.9 °C | 4.9 °C | 117.86 mm |
| Annual | 5.6 °C | 15.6 °C | 1339.86 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 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |