Millport, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.9 °C (low) to 14.8 °C (high). Annual precipitation averages 906 Millimeters. Millport is located in USDA Plant Hardiness Zone 6a. 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 | -9 °C | 0.6 °C | 51.31 mm |
| February | -8.6 °C | 2 °C | 43.94 mm |
| March | -4.7 °C | 6.6 °C | 65.28 mm |
| April | 0.9 °C | 14.3 °C | 79.5 mm |
| May | 7.1 °C | 21.1 °C | 75.95 mm |
| June | 12.2 °C | 25.6 °C | 97.79 mm |
| July | 14.7 °C | 28.2 °C | 93.73 mm |
| August | 14.1 °C | 27.4 °C | 90.93 mm |
| September | 10.1 °C | 23.3 °C | 95.25 mm |
| October | 4.1 °C | 16.3 °C | 87.88 mm |
| November | -1 °C | 9.4 °C | 64.52 mm |
| December | -5.2 °C | 3.3 °C | 59.94 mm |
| Annual | 2.9 °C | 14.8 °C | 906.02 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |