Plattsburgh, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3 °C (low) to 12.9 °C (high). Annual precipitation averages 890.5 Millimeters. Plattsburgh is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12 °C | -2.6 °C | 55.63 mm |
| February | -11.2 °C | -0.9 °C | 48.26 mm |
| March | -5.7 °C | 4 °C | 57.4 mm |
| April | 1.6 °C | 11.9 °C | 75.69 mm |
| May | 8.3 °C | 19.6 °C | 78.74 mm |
| June | 13.7 °C | 24.2 °C | 96.01 mm |
| July | 16.6 °C | 26.8 °C | 82.3 mm |
| August | 15.6 °C | 26.2 °C | 91.69 mm |
| September | 11.3 °C | 22 °C | 71.63 mm |
| October | 5.1 °C | 14.4 °C | 95.76 mm |
| November | -0.7 °C | 7.6 °C | 70.1 mm |
| December | -6.9 °C | 1.2 °C | 67.31 mm |
| Annual | 3 °C | 12.9 °C | 890.52 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |