Rosenhayn, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.6 °F (low) to 64.9 °F (high). Annual precipitation averages 46.1 Inches. Rosenhayn is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.9 °F | 41.9 °F | 3.41 in. |
| February | 26.2 °F | 44.4 °F | 2.91 in. |
| March | 32.9 °F | 52.0 °F | 4.29 in. |
| April | 42.9 °F | 64.0 °F | 3.43 in. |
| May | 52.6 °F | 73.5 °F | 3.52 in. |
| June | 62.1 °F | 82.3 °F | 4.26 in. |
| July | 67.5 °F | 86.8 °F | 4.65 in. |
| August | 65.5 °F | 84.5 °F | 4.56 in. |
| September | 58.8 °F | 78.9 °F | 3.95 in. |
| October | 46.9 °F | 67.3 °F | 3.86 in. |
| November | 37.0 °F | 56.4 °F | 3.1 in. |
| December | 29.9 °F | 46.7 °F | 4.11 in. |
| Annual | 45.6 °F | 64.9 °F | 46.05 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |