Port Jervis, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.5 °F (low) to 60.5 °F (high). Annual precipitation averages 45.9 Inches. Port Jervis is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.6 °F | 35.2 °F | 3.24 in. |
| February | 18.1 °F | 38.6 °F | 2.47 in. |
| March | 25.4 °F | 47.1 °F | 3.79 in. |
| April | 36.0 °F | 60.5 °F | 3.75 in. |
| May | 46.4 °F | 71.1 °F | 3.49 in. |
| June | 55.8 °F | 79.0 °F | 4.87 in. |
| July | 60.4 °F | 83.7 °F | 4.17 in. |
| August | 58.8 °F | 81.8 °F | 4.27 in. |
| September | 51.7 °F | 75.1 °F | 4.48 in. |
| October | 40.2 °F | 63.0 °F | 4.25 in. |
| November | 30.2 °F | 51.2 °F | 3.21 in. |
| December | 22.7 °F | 40.1 °F | 3.93 in. |
| Annual | 38.5 °F | 60.5 °F | 45.92 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 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 |