Keyport, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.9 °C (low) to 17.6 °C (high). Annual precipitation averages 1221 Millimeters. Keyport 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 | -3.9 °C | 4.8 °C | 93.47 mm |
| February | -3 °C | 6.2 °C | 73.41 mm |
| March | 0.7 °C | 10.2 °C | 107.95 mm |
| April | 6.2 °C | 16.8 °C | 98.81 mm |
| May | 11.6 °C | 22.1 °C | 96.77 mm |
| June | 16.7 °C | 27.2 °C | 113.79 mm |
| July | 19.9 °C | 29.8 °C | 115.82 mm |
| August | 18.9 °C | 28.9 °C | 112.78 mm |
| September | 15.5 °C | 25.2 °C | 105.16 mm |
| October | 9.2 °C | 19 °C | 107.19 mm |
| November | 3.7 °C | 12.9 °C | 85.6 mm |
| December | -0.7 °C | 7.7 °C | 110.24 mm |
| Annual | 7.9 °C | 17.6 °C | 1220.99 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |