Chappaqua, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 42.6 °F (low) to 61.6 °F (high). Annual precipitation averages 50.8 Inches. 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 | 21.1 °F | 37.1 °F | 3.87 in. |
| February | 22.6 °F | 40.2 °F | 2.8 in. |
| March | 29.4 °F | 48.2 °F | 4.08 in. |
| April | 39.9 °F | 61.2 °F | 3.96 in. |
| May | 49.5 °F | 71.4 °F | 3.68 in. |
| June | 58.9 °F | 79.7 °F | 4.73 in. |
| July | 64.1 °F | 84.6 °F | 4.57 in. |
| August | 63.0 °F | 82.6 °F | 4.97 in. |
| September | 55.6 °F | 75.7 °F | 4.83 in. |
| October | 44.4 °F | 64.0 °F | 4.74 in. |
| November | 35.1 °F | 52.7 °F | 4.26 in. |
| December | 27.2 °F | 42.1 °F | 4.29 in. |
| Annual | 42.6 °F | 61.6 °F | 50.78 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |