Dunkirk, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.6 °C (low) to 13.4 °C (high). Annual precipitation averages 1109.2 Millimeters. Dunkirk is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.3 °C | 0.7 °C | 75.95 mm |
| February | -6.4 °C | 1 °C | 55.88 mm |
| March | -3.2 °C | 5 °C | 75.95 mm |
| April | 2.5 °C | 11.8 °C | 83.57 mm |
| May | 8.9 °C | 18.2 °C | 91.19 mm |
| June | 14.9 °C | 23.3 °C | 89.41 mm |
| July | 17.8 °C | 25.7 °C | 103.38 mm |
| August | 17.1 °C | 25.2 °C | 94.74 mm |
| September | 13.6 °C | 21.9 °C | 112.01 mm |
| October | 7.7 °C | 15.5 °C | 121.67 mm |
| November | 2.4 °C | 9.1 °C | 106.93 mm |
| December | -2.3 °C | 3.8 °C | 98.55 mm |
| Annual | 5.6 °C | 13.4 °C | 1109.23 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |