Fair Lawn, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 17.2 °C (high). Annual precipitation averages 1244.6 Millimeters. Fair Lawn is located in USDA Plant Hardiness Zone 7a. 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 | -5.3 °C | 3.7 °C | 90.17 mm |
| February | -4.2 °C | 5.3 °C | 70.36 mm |
| March | -0.3 °C | 9.7 °C | 109.22 mm |
| April | 5.4 °C | 16.6 °C | 103.12 mm |
| May | 10.9 °C | 22.1 °C | 101.09 mm |
| June | 16.2 °C | 27.2 °C | 122.43 mm |
| July | 19.1 °C | 30 °C | 111 mm |
| August | 18.1 °C | 28.9 °C | 115.06 mm |
| September | 13.9 °C | 25.1 °C | 109.73 mm |
| October | 7.4 °C | 18.6 °C | 110.74 mm |
| November | 2.1 °C | 12.3 °C | 93.73 mm |
| December | -1.9 °C | 6.5 °C | 107.95 mm |
| Annual | 6.8 °C | 17.2 °C | 1244.6 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |