Harrisonville, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.5 °F (low) to 64.2 °F (high). Annual precipitation averages 47 Inches. Harrisonville is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.6 °F | 41.1 °F | 3.66 in. |
| February | 26.9 °F | 43.3 °F | 3.02 in. |
| March | 33.5 °F | 51.2 °F | 4.42 in. |
| April | 43.8 °F | 63.3 °F | 3.58 in. |
| May | 53.4 °F | 72.8 °F | 3.68 in. |
| June | 63.0 °F | 82.0 °F | 4.31 in. |
| July | 68.6 °F | 86.2 °F | 4.7 in. |
| August | 66.7 °F | 84.4 °F | 4.54 in. |
| September | 59.9 °F | 78.4 °F | 3.97 in. |
| October | 47.9 °F | 66.6 °F | 3.9 in. |
| November | 37.9 °F | 55.6 °F | 3.01 in. |
| December | 30.6 °F | 46.0 °F | 4.16 in. |
| Annual | 46.5 °F | 64.2 °F | 46.95 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |