Fortescue, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.5 °F (low) to 62.7 °F (high). Annual precipitation averages 43.9 Inches. Fortescue is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.9 °F | 41.6 °F | 3.2 in. |
| February | 28.5 °F | 42.5 °F | 2.88 in. |
| March | 35.0 °F | 49.8 °F | 4.05 in. |
| April | 45.2 °F | 60.2 °F | 3.37 in. |
| May | 54.8 °F | 69.0 °F | 3.71 in. |
| June | 64.3 °F | 79.2 °F | 3.92 in. |
| July | 70.1 °F | 83.4 °F | 4.26 in. |
| August | 68.4 °F | 82.3 °F | 4.25 in. |
| September | 62.4 °F | 76.8 °F | 3.72 in. |
| October | 51.2 °F | 65.9 °F | 3.72 in. |
| November | 40.9 °F | 55.5 °F | 2.98 in. |
| December | 32.8 °F | 46.4 °F | 3.79 in. |
| Annual | 48.5 °F | 62.7 °F | 43.85 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 |