Ossining, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 6 °C (low) to 16.6 °C (high). Annual precipitation averages 1244.6 Millimeters. Ossining is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 3.2 °C | 92.96 mm |
| February | -5 °C | 4.8 °C | 67.56 mm |
| March | -1.1 °C | 9.2 °C | 101.85 mm |
| April | 4.6 °C | 16.2 °C | 98.3 mm |
| May | 9.9 °C | 21.9 °C | 89.92 mm |
| June | 15.2 °C | 26.7 °C | 112.27 mm |
| July | 18.2 °C | 29.3 °C | 115.57 mm |
| August | 17.3 °C | 28.3 °C | 124.71 mm |
| September | 13.3 °C | 24.6 °C | 119.13 mm |
| October | 7 °C | 17.9 °C | 116.08 mm |
| November | 1.6 °C | 11.8 °C | 102.87 mm |
| December | -2.6 °C | 5.8 °C | 103.38 mm |
| Annual | 6 °C | 16.6 °C | 1244.6 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |