Belleplain, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.4 °F (low) to 64.8 °F (high). Annual precipitation averages 47.5 Inches. Belleplain is located in USDA Plant Hardiness Zone 7a. 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 | 24.7 °F | 43.0 °F | 3.36 in. |
| February | 25.5 °F | 45.1 °F | 3.12 in. |
| March | 32.4 °F | 52.0 °F | 4.58 in. |
| April | 42.5 °F | 63.2 °F | 3.64 in. |
| May | 51.9 °F | 72.1 °F | 3.49 in. |
| June | 61.4 °F | 81.2 °F | 3.81 in. |
| July | 66.9 °F | 85.8 °F | 4.68 in. |
| August | 65.3 °F | 84.1 °F | 4.8 in. |
| September | 59.1 °F | 78.4 °F | 4.07 in. |
| October | 48.0 °F | 67.5 °F | 4.33 in. |
| November | 37.5 °F | 57.1 °F | 3.4 in. |
| December | 29.7 °F | 47.8 °F | 4.26 in. |
| Annual | 45.4 °F | 64.8 °F | 47.54 in. |
| 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 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |