Lawrenceville, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 6.7 °C (low) to 17.5 °C (high). Annual precipitation averages 1232.9 Millimeters. Lawrenceville is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 4.4 °C | 89.92 mm |
| February | -4.2 °C | 5.9 °C | 71.37 mm |
| March | -0.3 °C | 10.3 °C | 108.97 mm |
| April | 5.3 °C | 17 °C | 93.98 mm |
| May | 10.8 °C | 22.3 °C | 104.14 mm |
| June | 15.8 °C | 27.3 °C | 115.06 mm |
| July | 18.8 °C | 29.9 °C | 129.03 mm |
| August | 17.9 °C | 28.9 °C | 114.05 mm |
| September | 13.8 °C | 25.3 °C | 103.89 mm |
| October | 7.4 °C | 18.7 °C | 102.36 mm |
| November | 1.8 °C | 12.8 °C | 86.87 mm |
| December | -2.2 °C | 7.1 °C | 113.28 mm |
| Annual | 6.7 °C | 17.5 °C | 1232.92 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |