Hightstown, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.8 °C (low) to 17.7 °C (high). Annual precipitation averages 1205.7 Millimeters. Hightstown is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 4.6 °C | 88.9 mm |
| February | -3.9 °C | 6.1 °C | 65.53 mm |
| March | -0.1 °C | 10.3 °C | 109.47 mm |
| April | 5.4 °C | 17.1 °C | 93.98 mm |
| May | 10.8 °C | 22.4 °C | 99.31 mm |
| June | 15.8 °C | 27.5 °C | 117.6 mm |
| July | 18.9 °C | 30.1 °C | 121.67 mm |
| August | 17.9 °C | 29.1 °C | 116.33 mm |
| September | 13.9 °C | 25.6 °C | 106.68 mm |
| October | 7.5 °C | 18.9 °C | 95.76 mm |
| November | 2 °C | 13.1 °C | 82.8 mm |
| December | -2 °C | 7.4 °C | 107.7 mm |
| Annual | 6.8 °C | 17.7 °C | 1205.73 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |