Dunkirk, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 42 °F (low) to 56.2 °F (high). Annual precipitation averages 43.7 Inches. 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 | 20.6 °F | 33.2 °F | 2.99 in. |
| February | 20.5 °F | 33.8 °F | 2.2 in. |
| March | 26.3 °F | 41.0 °F | 2.99 in. |
| April | 36.5 °F | 53.2 °F | 3.29 in. |
| May | 48.0 °F | 64.7 °F | 3.59 in. |
| June | 58.9 °F | 74.0 °F | 3.52 in. |
| July | 64.0 °F | 78.2 °F | 4.07 in. |
| August | 62.7 °F | 77.3 °F | 3.73 in. |
| September | 56.4 °F | 71.5 °F | 4.41 in. |
| October | 45.9 °F | 59.9 °F | 4.79 in. |
| November | 36.4 °F | 48.4 °F | 4.21 in. |
| December | 27.8 °F | 38.9 °F | 3.88 in. |
| Annual | 42 °F | 56.2 °F | 43.67 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |