Hopewell, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43 °F (low) to 63.1 °F (high). Annual precipitation averages 49.7 Inches. Hopewell is located in USDA Plant Hardiness Zone 7a. 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 | 22.1 °F | 39.2 °F | 3.62 in. |
| February | 23.3 °F | 41.7 °F | 2.85 in. |
| March | 30.3 °F | 50.0 °F | 4.24 in. |
| April | 40.6 °F | 62.4 °F | 3.93 in. |
| May | 50.5 °F | 71.9 °F | 4.2 in. |
| June | 59.6 °F | 81.0 °F | 4.61 in. |
| July | 64.7 °F | 85.8 °F | 5.22 in. |
| August | 63.1 °F | 83.8 °F | 4.6 in. |
| September | 55.8 °F | 77.4 °F | 4.28 in. |
| October | 44.3 °F | 65.3 °F | 4.17 in. |
| November | 34.4 °F | 54.5 °F | 3.46 in. |
| December | 27.2 °F | 44.1 °F | 4.48 in. |
| Annual | 43 °F | 63.1 °F | 49.66 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |