Cape Vincent, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.6 °C (low) to 12.1 °C (high). Annual precipitation averages 1004.1 Millimeters. Cape Vincent is located in USDA Plant Hardiness Zone 5b. 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 | -10.6 °C | -2.1 °C | 86.36 mm |
| February | -10.1 °C | -1.4 °C | 66.29 mm |
| March | -5.1 °C | 3.1 °C | 67.56 mm |
| April | 1.6 °C | 10.7 °C | 83.57 mm |
| May | 7.8 °C | 17.2 °C | 80.77 mm |
| June | 13.4 °C | 22.2 °C | 85.09 mm |
| July | 16.8 °C | 25.6 °C | 78.23 mm |
| August | 16.2 °C | 25.2 °C | 80.52 mm |
| September | 12.1 °C | 21.4 °C | 87.88 mm |
| October | 6.2 °C | 14.2 °C | 105.41 mm |
| November | 0.2 °C | 7.7 °C | 92.71 mm |
| December | -5.7 °C | 1.6 °C | 89.66 mm |
| Annual | 3.6 °C | 12.1 °C | 1004.05 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |