Rockaway, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.7 °C (low) to 16.3 °C (high). Annual precipitation averages 1305.6 Millimeters. Rockaway is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.4 °C | 2.8 °C | 95.76 mm |
| February | -5.8 °C | 4 °C | 75.69 mm |
| March | -1.7 °C | 8.7 °C | 111.25 mm |
| April | 4.4 °C | 15.8 °C | 100.58 mm |
| May | 9.8 °C | 21.4 °C | 101.6 mm |
| June | 15.2 °C | 26.3 °C | 143.26 mm |
| July | 17.8 °C | 29.6 °C | 115.57 mm |
| August | 17 °C | 28.3 °C | 120.9 mm |
| September | 12.8 °C | 24.5 °C | 122.43 mm |
| October | 6.4 °C | 17.8 °C | 112.01 mm |
| November | 1.2 °C | 11.3 °C | 91.69 mm |
| December | -2.9 °C | 5.5 °C | 114.81 mm |
| Annual | 5.7 °C | 16.3 °C | 1305.55 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |