Richwood, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.9 °F (low) to 64.6 °F (high). Annual precipitation averages 47.6 Inches. Richwood 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 | 25.0 °F | 41.3 °F | 3.81 in. |
| February | 26.4 °F | 43.7 °F | 2.88 in. |
| March | 32.9 °F | 51.6 °F | 4.53 in. |
| April | 43.3 °F | 63.8 °F | 3.6 in. |
| May | 52.9 °F | 73.4 °F | 3.77 in. |
| June | 62.4 °F | 82.5 °F | 4.34 in. |
| July | 67.9 °F | 86.7 °F | 4.7 in. |
| August | 66.2 °F | 84.8 °F | 4.58 in. |
| September | 59.5 °F | 78.4 °F | 4.1 in. |
| October | 47.3 °F | 66.6 °F | 3.99 in. |
| November | 37.2 °F | 55.7 °F | 3.05 in. |
| December | 30.3 °F | 46.2 °F | 4.26 in. |
| Annual | 45.9 °F | 64.6 °F | 47.61 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 |