Glassboro, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.5 °F (low) to 64.6 °F (high). Annual precipitation averages 48.1 Inches. Glassboro 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 | 24.6 °F | 41.4 °F | 3.92 in. |
| February | 26.0 °F | 43.8 °F | 2.92 in. |
| March | 32.6 °F | 51.5 °F | 4.6 in. |
| April | 42.9 °F | 63.8 °F | 3.63 in. |
| May | 52.4 °F | 73.5 °F | 3.82 in. |
| June | 61.9 °F | 82.6 °F | 4.35 in. |
| July | 67.4 °F | 86.6 °F | 4.76 in. |
| August | 65.7 °F | 84.8 °F | 4.65 in. |
| September | 59.0 °F | 78.5 °F | 4.1 in. |
| October | 46.9 °F | 66.6 °F | 3.99 in. |
| November | 36.8 °F | 55.8 °F | 3.03 in. |
| December | 29.8 °F | 46.2 °F | 4.29 in. |
| Annual | 45.5 °F | 64.6 °F | 48.06 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 |