Chappaqua, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 5.9 °C (low) to 16.5 °C (high). Annual precipitation averages 1289.8 Millimeters. Chappaqua 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 | -6.1 °C | 2.8 °C | 98.3 mm |
| February | -5.2 °C | 4.6 °C | 71.12 mm |
| March | -1.4 °C | 9 °C | 103.63 mm |
| April | 4.4 °C | 16.2 °C | 100.58 mm |
| May | 9.7 °C | 21.9 °C | 93.47 mm |
| June | 14.9 °C | 26.5 °C | 120.14 mm |
| July | 17.8 °C | 29.2 °C | 116.08 mm |
| August | 17.2 °C | 28.1 °C | 126.24 mm |
| September | 13.1 °C | 24.3 °C | 122.68 mm |
| October | 6.9 °C | 17.8 °C | 120.4 mm |
| November | 1.7 °C | 11.5 °C | 108.2 mm |
| December | -2.7 °C | 5.6 °C | 108.97 mm |
| Annual | 5.9 °C | 16.5 °C | 1289.81 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 |