Flemington, 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 17.2 °C (high). Annual precipitation averages 1278.4 Millimeters. Flemington 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 | -5.9 °C | 3.9 °C | 93.47 mm |
| February | -5.2 °C | 5.3 °C | 74.93 mm |
| March | -1.2 °C | 10 °C | 110.24 mm |
| April | 4.4 °C | 16.9 °C | 103.63 mm |
| May | 10 °C | 22.3 °C | 108.71 mm |
| June | 15.1 °C | 27.2 °C | 118.36 mm |
| July | 17.9 °C | 29.9 °C | 132.33 mm |
| August | 17.1 °C | 28.8 °C | 114.81 mm |
| September | 12.9 °C | 25.2 °C | 111.25 mm |
| October | 6.6 °C | 18.4 °C | 108.71 mm |
| November | 0.9 °C | 12.3 °C | 86.87 mm |
| December | -2.9 °C | 6.6 °C | 115.06 mm |
| Annual | 5.8 °C | 17.2 °C | 1278.37 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |