Trenton, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45 °F (low) to 64.2 °F (high). Annual precipitation averages 47.8 Inches. Trenton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.1 °F | 40.6 °F | 3.55 in. |
| February | 25.5 °F | 43.3 °F | 2.76 in. |
| March | 32.6 °F | 51.1 °F | 4.35 in. |
| April | 42.5 °F | 63.2 °F | 3.58 in. |
| May | 52.2 °F | 72.7 °F | 4.0 in. |
| June | 61.5 °F | 81.8 °F | 4.44 in. |
| July | 66.9 °F | 86.4 °F | 5.01 in. |
| August | 65.2 °F | 84.7 °F | 4.47 in. |
| September | 58.1 °F | 78.4 °F | 3.99 in. |
| October | 46.4 °F | 66.4 °F | 3.95 in. |
| November | 36.4 °F | 55.7 °F | 3.35 in. |
| December | 29.0 °F | 45.6 °F | 4.36 in. |
| Annual | 45 °F | 64.2 °F | 47.81 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |