Highland Lakes, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 14.5 °C (high). Annual precipitation averages 1300.5 Millimeters. Highland Lakes is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.3 °C | 0.6 °C | 96.52 mm |
| February | -7.4 °C | 2.3 °C | 75.69 mm |
| March | -3.4 °C | 6.4 °C | 115.06 mm |
| April | 3.1 °C | 14.1 °C | 98.55 mm |
| May | 8.7 °C | 20.2 °C | 99.57 mm |
| June | 13.8 °C | 24.7 °C | 128.02 mm |
| July | 16.4 °C | 27.4 °C | 112.27 mm |
| August | 15.8 °C | 26.4 °C | 126.75 mm |
| September | 11.6 °C | 22.8 °C | 123.7 mm |
| October | 5.7 °C | 16.2 °C | 114.3 mm |
| November | 0 °C | 9.6 °C | 94.23 mm |
| December | -4.7 °C | 3.4 °C | 115.82 mm |
| Annual | 4.3 °C | 14.5 °C | 1300.48 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |