Mount Ephraim, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.5 °F (low) to 65.2 °F (high). Annual precipitation averages 47.2 Inches. Mount Ephraim 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 | 26.5 °F | 41.8 °F | 3.55 in. |
| February | 27.9 °F | 44.5 °F | 2.79 in. |
| March | 34.6 °F | 52.3 °F | 4.46 in. |
| April | 44.8 °F | 64.5 °F | 3.51 in. |
| May | 54.3 °F | 74.0 °F | 3.86 in. |
| June | 63.7 °F | 83.2 °F | 4.26 in. |
| July | 69.2 °F | 87.6 °F | 4.69 in. |
| August | 67.6 °F | 85.6 °F | 4.87 in. |
| September | 60.9 °F | 78.9 °F | 4.06 in. |
| October | 49.3 °F | 67.0 °F | 3.83 in. |
| November | 39.1 °F | 56.2 °F | 3.09 in. |
| December | 31.8 °F | 46.5 °F | 4.2 in. |
| Annual | 47.5 °F | 65.2 °F | 47.17 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |