Salem, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.6 °F (low) to 64 °F (high). Annual precipitation averages 45.5 Inches. Salem 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 | 25.4 °F | 41.0 °F | 3.38 in. |
| February | 26.7 °F | 43.3 °F | 2.92 in. |
| March | 33.7 °F | 51.0 °F | 4.12 in. |
| April | 44.1 °F | 63.0 °F | 3.53 in. |
| May | 53.9 °F | 72.5 °F | 3.64 in. |
| June | 63.5 °F | 81.4 °F | 4.43 in. |
| July | 68.5 °F | 85.7 °F | 4.51 in. |
| August | 67.1 °F | 84.0 °F | 4.21 in. |
| September | 60.2 °F | 78.1 °F | 4.04 in. |
| October | 48.3 °F | 66.5 °F | 3.77 in. |
| November | 37.6 °F | 55.3 °F | 3.0 in. |
| December | 30.4 °F | 45.6 °F | 3.93 in. |
| Annual | 46.6 °F | 64 °F | 45.48 in. |
| 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 : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |