Clayton, 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 18.2 °C (high). Annual precipitation averages 1230.6 Millimeters. Clayton 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 | -4 °C | 5.3 °C | 100.08 mm |
| February | -3.3 °C | 6.7 °C | 76.2 mm |
| March | 0.3 °C | 10.9 °C | 117.6 mm |
| April | 6.1 °C | 17.7 °C | 91.95 mm |
| May | 11.3 °C | 23.1 °C | 96.52 mm |
| June | 16.6 °C | 28.1 °C | 111.25 mm |
| July | 19.7 °C | 30.4 °C | 123.44 mm |
| August | 18.7 °C | 29.3 °C | 122.17 mm |
| September | 14.9 °C | 25.8 °C | 104.65 mm |
| October | 8.2 °C | 19.3 °C | 100.33 mm |
| November | 2.6 °C | 13.3 °C | 77.22 mm |
| December | -1.2 °C | 8 °C | 109.22 mm |
| Annual | 7.5 °C | 18.2 °C | 1230.63 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |