North Castle, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 6 °C (low) to 16.2 °C (high). Annual precipitation averages 1283.7 Millimeters. North Castle 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 °C | 2.8 °C | 99.57 mm |
| February | -5.2 °C | 4.3 °C | 71.88 mm |
| March | -1.3 °C | 8.7 °C | 104.65 mm |
| April | 4.3 °C | 15.8 °C | 101.6 mm |
| May | 9.7 °C | 21.5 °C | 93.98 mm |
| June | 15.1 °C | 26.1 °C | 116.59 mm |
| July | 18.1 °C | 29 °C | 109.98 mm |
| August | 17.4 °C | 27.8 °C | 125.48 mm |
| September | 13.3 °C | 23.9 °C | 123.7 mm |
| October | 7.1 °C | 17.4 °C | 120.4 mm |
| November | 1.7 °C | 11.3 °C | 106.43 mm |
| December | -2.6 °C | 5.6 °C | 109.47 mm |
| Annual | 6 °C | 16.2 °C | 1283.73 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 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |