Frenchtown, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.8 °C (low) to 17.6 °C (high). Annual precipitation averages 1270.8 Millimeters. Frenchtown 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 | -5.8 °C | 4.1 °C | 90.68 mm |
| February | -5.1 °C | 5.6 °C | 75.95 mm |
| March | -1.2 °C | 10.3 °C | 105.92 mm |
| April | 4.2 °C | 17.3 °C | 100.84 mm |
| May | 9.8 °C | 22.6 °C | 107.44 mm |
| June | 15.2 °C | 27.6 °C | 117.86 mm |
| July | 17.9 °C | 30.2 °C | 129.79 mm |
| August | 16.8 °C | 29.1 °C | 116.33 mm |
| September | 12.7 °C | 25.5 °C | 116.33 mm |
| October | 6.5 °C | 18.9 °C | 111 mm |
| November | 1.1 °C | 12.6 °C | 86.61 mm |
| December | -2.8 °C | 6.8 °C | 112.01 mm |
| Annual | 5.8 °C | 17.6 °C | 1270.76 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |