Union City, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 48.1 °F (low) to 62.6 °F (high). Annual precipitation averages 47.4 Inches. Union City is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.7 °F | 39.2 °F | 3.55 in. |
| February | 28.0 °F | 41.7 °F | 2.81 in. |
| March | 34.5 °F | 49.1 °F | 4.26 in. |
| April | 44.8 °F | 60.9 °F | 4.07 in. |
| May | 54.2 °F | 70.8 °F | 3.87 in. |
| June | 63.8 °F | 80.2 °F | 4.36 in. |
| July | 70.1 °F | 85.3 °F | 4.38 in. |
| August | 68.6 °F | 83.4 °F | 4.41 in. |
| September | 62.1 °F | 76.9 °F | 4.04 in. |
| October | 50.7 °F | 65.1 °F | 4.11 in. |
| November | 40.5 °F | 54.2 °F | 3.41 in. |
| December | 32.7 °F | 44.5 °F | 4.14 in. |
| Annual | 48.1 °F | 62.6 °F | 47.41 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |