Flagtown, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.9 °C (low) to 17.3 °C (high). Annual precipitation averages 1244.4 Millimeters. Flagtown 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 | -5.8 °C | 3.9 °C | 91.44 mm |
| February | -5.1 °C | 5.4 °C | 71.63 mm |
| March | -1.1 °C | 10 °C | 106.93 mm |
| April | 4.5 °C | 16.9 °C | 99.57 mm |
| May | 10 °C | 22.3 °C | 104.39 mm |
| June | 15 °C | 27.2 °C | 116.08 mm |
| July | 17.9 °C | 29.9 °C | 127.25 mm |
| August | 17.1 °C | 28.8 °C | 116.33 mm |
| September | 13 °C | 25.2 °C | 107.7 mm |
| October | 6.7 °C | 18.4 °C | 107.7 mm |
| November | 0.9 °C | 12.6 °C | 85.6 mm |
| December | -2.8 °C | 6.7 °C | 109.73 mm |
| Annual | 5.9 °C | 17.3 °C | 1244.35 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |