Long Valley, New Jersey has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.2 °F (low) to 61 °F (high). Annual precipitation averages 52.7 Inches. Long Valley is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.8 °F | 37.1 °F | 3.93 in. |
| February | 21.0 °F | 39.7 °F | 3.13 in. |
| March | 28.2 °F | 48.0 °F | 4.18 in. |
| April | 38.9 °F | 60.9 °F | 4.13 in. |
| May | 48.9 °F | 70.4 °F | 4.14 in. |
| June | 58.0 °F | 78.7 °F | 5.11 in. |
| July | 62.9 °F | 83.3 °F | 4.77 in. |
| August | 61.4 °F | 81.6 °F | 5.16 in. |
| September | 54.0 °F | 74.8 °F | 4.99 in. |
| October | 42.4 °F | 63.4 °F | 4.93 in. |
| November | 32.6 °F | 52.3 °F | 3.69 in. |
| December | 25.7 °F | 42.1 °F | 4.57 in. |
| Annual | 41.2 °F | 61 °F | 52.73 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |