Lake Hiawatha, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.8 °F (low) to 62.4 °F (high). Annual precipitation averages 48.7 Inches. Lake Hiawatha 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.3 °F | 38.2 °F | 3.66 in. |
| February | 22.5 °F | 40.8 °F | 2.73 in. |
| March | 30.0 °F | 49.1 °F | 4.05 in. |
| April | 40.6 °F | 61.4 °F | 3.98 in. |
| May | 50.3 °F | 71.5 °F | 4.05 in. |
| June | 59.7 °F | 80.3 °F | 4.9 in. |
| July | 64.7 °F | 85.5 °F | 4.34 in. |
| August | 62.9 °F | 83.6 °F | 4.6 in. |
| September | 55.5 °F | 76.8 °F | 4.2 in. |
| October | 43.8 °F | 64.7 °F | 4.4 in. |
| November | 34.5 °F | 53.4 °F | 3.59 in. |
| December | 27.2 °F | 43.2 °F | 4.21 in. |
| Annual | 42.8 °F | 62.4 °F | 48.71 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |