Leesburg, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.3 °C (low) to 17.9 °C (high). Annual precipitation averages 1168.7 Millimeters. Leesburg is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.2 °C | 5.8 °C | 84.58 mm |
| February | -2.8 °C | 6.8 °C | 76.45 mm |
| March | 0.9 °C | 10.7 °C | 111 mm |
| April | 6.4 °C | 17.1 °C | 88.65 mm |
| May | 11.7 °C | 22.1 °C | 89.66 mm |
| June | 17.1 °C | 27.2 °C | 99.06 mm |
| July | 20.1 °C | 29.7 °C | 115.06 mm |
| August | 19.2 °C | 28.6 °C | 117.86 mm |
| September | 16.1 °C | 25.5 °C | 98.3 mm |
| October | 9.9 °C | 19.4 °C | 102.62 mm |
| November | 4 °C | 13.6 °C | 81.28 mm |
| December | -0.3 °C | 8.6 °C | 104.14 mm |
| Annual | 8.3 °C | 17.9 °C | 1168.66 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |