Elwood, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.7 °C (low) to 18.1 °C (high). Annual precipitation averages 1214.1 Millimeters. Elwood is located in USDA Plant Hardiness Zone 7a. 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 | -4.6 °C | 5.7 °C | 92.2 mm |
| February | -4 °C | 7.1 °C | 74.93 mm |
| March | -0.1 °C | 11.1 °C | 116.84 mm |
| April | 5.3 °C | 17.3 °C | 89.66 mm |
| May | 10.7 °C | 22.5 °C | 89.66 mm |
| June | 15.8 °C | 27.6 °C | 102.62 mm |
| July | 18.7 °C | 30 °C | 122.94 mm |
| August | 17.8 °C | 29 °C | 120.9 mm |
| September | 14.1 °C | 25.6 °C | 103.63 mm |
| October | 7.3 °C | 19.3 °C | 104.14 mm |
| November | 1.8 °C | 13.7 °C | 85.34 mm |
| December | -1.9 °C | 8.3 °C | 111.25 mm |
| Annual | 6.7 °C | 18.1 °C | 1214.11 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |