Fair Lawn, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.2 °F (low) to 62.9 °F (high). Annual precipitation averages 49 Inches. 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 | 22.5 °F | 38.7 °F | 3.55 in. |
| February | 24.4 °F | 41.5 °F | 2.77 in. |
| March | 31.4 °F | 49.5 °F | 4.3 in. |
| April | 41.8 °F | 61.9 °F | 4.06 in. |
| May | 51.7 °F | 71.8 °F | 3.98 in. |
| June | 61.2 °F | 81.0 °F | 4.82 in. |
| July | 66.3 °F | 86.0 °F | 4.37 in. |
| August | 64.6 °F | 84.0 °F | 4.53 in. |
| September | 57.1 °F | 77.2 °F | 4.32 in. |
| October | 45.3 °F | 65.4 °F | 4.36 in. |
| November | 35.8 °F | 54.1 °F | 3.69 in. |
| December | 28.5 °F | 43.7 °F | 4.25 in. |
| Annual | 44.2 °F | 62.9 °F | 49 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |