Armonk, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 6.2 °C (low) to 16.4 °C (high). Annual precipitation averages 1283.5 Millimeters. Armonk 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 | -5.7 °C | 2.9 °C | 99.06 mm |
| February | -4.9 °C | 4.6 °C | 71.37 mm |
| March | -1.1 °C | 8.9 °C | 104.65 mm |
| April | 4.6 °C | 15.9 °C | 100.58 mm |
| May | 9.8 °C | 21.6 °C | 93.73 mm |
| June | 15.2 °C | 26.3 °C | 118.87 mm |
| July | 18.2 °C | 29.1 °C | 110.74 mm |
| August | 17.4 °C | 27.9 °C | 124.97 mm |
| September | 13.5 °C | 24 °C | 122.94 mm |
| October | 7.2 °C | 17.6 °C | 120.4 mm |
| November | 1.9 °C | 11.6 °C | 106.93 mm |
| December | -2.2 °C | 5.8 °C | 109.22 mm |
| Annual | 6.2 °C | 16.4 °C | 1283.46 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 | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |