Palmyra, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.8 °C (low) to 18.3 °C (high). Annual precipitation averages 1208 Millimeters. Palmyra 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.9 °C | 5.3 °C | 89.92 mm |
| February | -2.1 °C | 6.9 °C | 71.12 mm |
| March | 1.6 °C | 11.2 °C | 112.52 mm |
| April | 7.2 °C | 17.8 °C | 91.19 mm |
| May | 12.6 °C | 22.9 °C | 100.08 mm |
| June | 17.9 °C | 28.1 °C | 108.46 mm |
| July | 20.9 °C | 30.6 °C | 119.13 mm |
| August | 20.2 °C | 29.7 °C | 123.7 mm |
| September | 16.1 °C | 26.2 °C | 105.66 mm |
| October | 9.7 °C | 19.4 °C | 97.79 mm |
| November | 4.1 °C | 13.4 °C | 79.5 mm |
| December | -0.1 °C | 7.9 °C | 108.97 mm |
| Annual | 8.8 °C | 18.3 °C | 1208.04 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |