Olivet, New Jersey has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.6 °C (low) to 18.2 °C (high). Annual precipitation averages 1185.4 Millimeters. Olivet 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 | -3.9 °C | 5.4 °C | 89.15 mm |
| February | -3.1 °C | 6.7 °C | 73.66 mm |
| March | 0.6 °C | 11 °C | 109.98 mm |
| April | 6.2 °C | 17.8 °C | 89.15 mm |
| May | 11.6 °C | 23.1 °C | 90.68 mm |
| June | 16.8 °C | 28.1 °C | 110.49 mm |
| July | 19.8 °C | 30.4 °C | 119.63 mm |
| August | 18.7 °C | 29.2 °C | 115.82 mm |
| September | 14.9 °C | 26 °C | 103.38 mm |
| October | 8.3 °C | 19.6 °C | 99.06 mm |
| November | 2.8 °C | 13.4 °C | 79.5 mm |
| December | -1.2 °C | 8.1 °C | 104.9 mm |
| Annual | 7.6 °C | 18.2 °C | 1185.4 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 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |