Copenhagen, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.1 °C (low) to 11.6 °C (high). Annual precipitation averages 1299.5 Millimeters. Copenhagen is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.9 °C | -3.2 °C | 124.21 mm |
| February | -12.3 °C | -1.9 °C | 91.69 mm |
| March | -7.5 °C | 2.8 °C | 84.84 mm |
| April | -0.2 °C | 10.6 °C | 96.77 mm |
| May | 6.6 °C | 18.3 °C | 102.87 mm |
| June | 11.4 °C | 22.4 °C | 91.69 mm |
| July | 13.9 °C | 24.9 °C | 101.09 mm |
| August | 13.2 °C | 24.6 °C | 106.93 mm |
| September | 8.9 °C | 20.8 °C | 111 mm |
| October | 3.3 °C | 13.7 °C | 143 mm |
| November | -2.5 °C | 6.4 °C | 122.17 mm |
| December | -8.7 °C | 0.1 °C | 123.19 mm |
| Annual | 1.1 °C | 11.6 °C | 1299.45 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |