Stillwater, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.3 °C (low) to 15 °C (high). Annual precipitation averages 1083.3 Millimeters. Stillwater is located in USDA Plant Hardiness Zone 6a. 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 | -9 °C | 0.3 °C | 76.45 mm |
| February | -8.3 °C | 1.9 °C | 55.63 mm |
| March | -3.4 °C | 6.9 °C | 73.66 mm |
| April | 2.9 °C | 14.8 °C | 86.36 mm |
| May | 9.3 °C | 21.3 °C | 89.92 mm |
| June | 14.3 °C | 25.9 °C | 121.16 mm |
| July | 16.7 °C | 29.1 °C | 115.06 mm |
| August | 16.1 °C | 27.5 °C | 106.17 mm |
| September | 11.7 °C | 23.4 °C | 96.52 mm |
| October | 5.5 °C | 16.3 °C | 102.11 mm |
| November | 0.1 °C | 9.3 °C | 76.96 mm |
| December | -4.8 °C | 3.2 °C | 83.31 mm |
| Annual | 4.3 °C | 15 °C | 1083.31 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 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |