Phillipsburg, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.4 °C (low) to 17 °C (high). Annual precipitation averages 1283.2 Millimeters. Phillipsburg 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 | -6.3 °C | 3.3 °C | 90.68 mm |
| February | -5.5 °C | 5 °C | 73.41 mm |
| March | -1.6 °C | 9.7 °C | 102.36 mm |
| April | 4.1 °C | 16.8 °C | 103.63 mm |
| May | 9.7 °C | 22.3 °C | 108.97 mm |
| June | 14.9 °C | 27.1 °C | 121.67 mm |
| July | 17.5 °C | 29.7 °C | 121.67 mm |
| August | 16.5 °C | 28.6 °C | 127.51 mm |
| September | 12.4 °C | 24.9 °C | 120.14 mm |
| October | 6.1 °C | 18.5 °C | 115.57 mm |
| November | 0.7 °C | 12.1 °C | 89.15 mm |
| December | -3.3 °C | 6.1 °C | 108.46 mm |
| Annual | 5.4 °C | 17 °C | 1283.22 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |