Lawrenceville, Pennsylvania has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.4 °F (low) to 58.6 °F (high). Annual precipitation averages 35.6 Inches. Lawrenceville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.9 °F | 33.0 °F | 2.17 in. |
| February | 15.7 °F | 35.5 °F | 1.77 in. |
| March | 22.7 °F | 44.2 °F | 2.53 in. |
| April | 33.0 °F | 57.8 °F | 3.04 in. |
| May | 44.1 °F | 70.1 °F | 3.11 in. |
| June | 53.5 °F | 78.2 °F | 3.86 in. |
| July | 57.7 °F | 82.6 °F | 3.34 in. |
| August | 56.4 °F | 81.1 °F | 3.52 in. |
| September | 49.6 °F | 73.8 °F | 3.98 in. |
| October | 38.6 °F | 61.2 °F | 3.36 in. |
| November | 29.2 °F | 48.4 °F | 2.55 in. |
| December | 21.9 °F | 37.8 °F | 2.41 in. |
| Annual | 36.4 °F | 58.6 °F | 35.64 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |