Princeton Junction, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.2 °F (low) to 63.9 °F (high). Annual precipitation averages 48.5 Inches. Princeton Junction 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 | 23.4 °F | 40.2 °F | 3.48 in. |
| February | 24.9 °F | 42.8 °F | 2.68 in. |
| March | 31.8 °F | 50.7 °F | 4.37 in. |
| April | 41.8 °F | 62.9 °F | 3.76 in. |
| May | 51.4 °F | 72.6 °F | 4.04 in. |
| June | 60.5 °F | 81.7 °F | 4.6 in. |
| July | 66.0 °F | 86.3 °F | 5.0 in. |
| August | 64.3 °F | 84.5 °F | 4.57 in. |
| September | 57.0 °F | 78.2 °F | 4.21 in. |
| October | 45.6 °F | 66.1 °F | 3.96 in. |
| November | 35.5 °F | 55.4 °F | 3.36 in. |
| December | 28.3 °F | 45.2 °F | 4.42 in. |
| Annual | 44.2 °F | 63.9 °F | 48.45 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |