Hainesburg, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.4 °F (low) to 62 °F (high). Annual precipitation averages 50.9 Inches. Hainesburg is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.2 °F | 37.3 °F | 3.6 in. |
| February | 20.7 °F | 40.4 °F | 2.9 in. |
| March | 27.4 °F | 48.8 °F | 3.95 in. |
| April | 37.7 °F | 61.8 °F | 4.05 in. |
| May | 48.1 °F | 71.8 °F | 4.2 in. |
| June | 57.2 °F | 79.8 °F | 4.9 in. |
| July | 62.2 °F | 84.6 °F | 4.69 in. |
| August | 60.4 °F | 82.7 °F | 4.78 in. |
| September | 53.2 °F | 76.4 °F | 4.99 in. |
| October | 41.7 °F | 64.6 °F | 4.95 in. |
| November | 31.4 °F | 53.1 °F | 3.53 in. |
| December | 25.0 °F | 42.8 °F | 4.36 in. |
| Annual | 40.4 °F | 62 °F | 50.9 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |