Forestport, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.5 °F (low) to 52.9 °F (high). Annual precipitation averages 52.9 Inches. Forestport is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.1 °F | 26.7 °F | 4.25 in. |
| February | 8.1 °F | 29.4 °F | 3.48 in. |
| March | 16.6 °F | 37.7 °F | 3.71 in. |
| April | 29.8 °F | 51.4 °F | 4.0 in. |
| May | 41.8 °F | 65.0 °F | 4.52 in. |
| June | 51.2 °F | 72.8 °F | 4.76 in. |
| July | 55.7 °F | 77.0 °F | 4.71 in. |
| August | 54.2 °F | 75.7 °F | 4.36 in. |
| September | 46.9 °F | 68.7 °F | 4.69 in. |
| October | 36.4 °F | 55.8 °F | 5.36 in. |
| November | 26.4 °F | 43.2 °F | 4.37 in. |
| December | 15.7 °F | 31.9 °F | 4.69 in. |
| Annual | 32.5 °F | 52.9 °F | 52.9 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |