Andover, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 40.5 °F (low) to 60.5 °F (high). Annual precipitation averages 48.4 Inches. Andover 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. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.1 °F | 35.9 °F | 3.45 in. |
| February | 19.7 °F | 38.9 °F | 2.77 in. |
| March | 27.4 °F | 47.1 °F | 3.95 in. |
| April | 38.6 °F | 59.8 °F | 3.61 in. |
| May | 48.5 °F | 70.1 °F | 4.01 in. |
| June | 57.9 °F | 78.7 °F | 4.99 in. |
| July | 62.5 °F | 83.6 °F | 4.25 in. |
| August | 60.9 °F | 81.6 °F | 4.76 in. |
| September | 53.3 °F | 74.9 °F | 4.63 in. |
| October | 41.9 °F | 63.0 °F | 4.53 in. |
| November | 32.1 °F | 51.6 °F | 3.43 in. |
| December | 24.7 °F | 40.9 °F | 4.03 in. |
| Annual | 40.5 °F | 60.5 °F | 48.41 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 |