Plattekill, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.6 °C (low) to 15.5 °C (high). Annual precipitation averages 1236 Millimeters. Plattekill is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | 1.4 °C | 87.63 mm |
| February | -7.1 °C | 3.3 °C | 70.87 mm |
| March | -2.9 °C | 7.9 °C | 97.79 mm |
| April | 3.3 °C | 15.4 °C | 95.76 mm |
| May | 9.2 °C | 21.3 °C | 95 mm |
| June | 14.2 °C | 25.8 °C | 119.38 mm |
| July | 17.1 °C | 28.6 °C | 115.32 mm |
| August | 16.1 °C | 27.7 °C | 115.82 mm |
| September | 12.2 °C | 23.7 °C | 120.4 mm |
| October | 5.8 °C | 16.9 °C | 119.38 mm |
| November | 0.4 °C | 10.2 °C | 92.46 mm |
| December | -4.6 °C | 4.1 °C | 106.17 mm |
| Annual | 4.6 °C | 15.5 °C | 1235.98 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |