Delmont, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.3 °F (low) to 63.6 °F (high). Annual precipitation averages 46.6 Inches. Delmont 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 | 26.6 °F | 42.0 °F | 3.34 in. |
| February | 27.4 °F | 43.5 °F | 3.04 in. |
| March | 34.2 °F | 50.4 °F | 4.44 in. |
| April | 44.1 °F | 61.8 °F | 3.56 in. |
| May | 53.4 °F | 70.9 °F | 3.52 in. |
| June | 63.1 °F | 80.2 °F | 3.83 in. |
| July | 68.7 °F | 84.7 °F | 4.55 in. |
| August | 66.9 °F | 83.1 °F | 4.7 in. |
| September | 61.2 °F | 77.4 °F | 3.98 in. |
| October | 50.1 °F | 66.9 °F | 4.18 in. |
| November | 39.6 °F | 55.9 °F | 3.29 in. |
| December | 31.7 °F | 46.8 °F | 4.13 in. |
| Annual | 47.3 °F | 63.6 °F | 46.56 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 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |