Marksboro, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 16.3 °C (high). Annual precipitation averages 1234.7 Millimeters. Marksboro 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.6 °C | 2.6 °C | 87.63 mm |
| February | -6.8 °C | 4.3 °C | 70.1 mm |
| March | -2.9 °C | 9 °C | 99.06 mm |
| April | 2.9 °C | 16.2 °C | 95 mm |
| May | 8.7 °C | 21.8 °C | 101.09 mm |
| June | 13.7 °C | 26.1 °C | 125.22 mm |
| July | 16.4 °C | 28.8 °C | 112.27 mm |
| August | 15.4 °C | 27.8 °C | 121.16 mm |
| September | 11.4 °C | 24.2 °C | 118.11 mm |
| October | 4.9 °C | 17.7 °C | 115.06 mm |
| November | -0.7 °C | 11.4 °C | 85.85 mm |
| December | -4.4 °C | 5.5 °C | 104.14 mm |
| Annual | 4.3 °C | 16.3 °C | 1234.69 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 | Dfb - Humid Continental Mild Summer, Wet All Year |