Katonah, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6 °C (low) to 16.7 °C (high). Annual precipitation averages 1234.7 Millimeters. Katonah 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 | 3.1 °C | 92.71 mm |
| February | -5.1 °C | 4.7 °C | 64.52 mm |
| March | -1.2 °C | 9.1 °C | 95.5 mm |
| April | 4.5 °C | 16.4 °C | 98.55 mm |
| May | 9.8 °C | 22.2 °C | 86.87 mm |
| June | 15 °C | 26.9 °C | 105.92 mm |
| July | 18.1 °C | 29.7 °C | 120.9 mm |
| August | 17.3 °C | 28.6 °C | 130.05 mm |
| September | 13.2 °C | 24.6 °C | 116.59 mm |
| October | 6.9 °C | 18.1 °C | 120.14 mm |
| November | 1.6 °C | 11.6 °C | 104.65 mm |
| December | -2.6 °C | 5.7 °C | 98.3 mm |
| Annual | 6 °C | 16.7 °C | 1234.7 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |