Castorland, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.5 °C (low) to 12.3 °C (high). Annual precipitation averages 1056.9 Millimeters. Castorland is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.1 °C | -2.7 °C | 88.14 mm |
| February | -12.4 °C | -1.4 °C | 64.52 mm |
| March | -7.1 °C | 3.4 °C | 65.53 mm |
| April | 0.2 °C | 11.3 °C | 80.26 mm |
| May | 6.8 °C | 18.9 °C | 89.15 mm |
| June | 12.1 °C | 23.5 °C | 95.76 mm |
| July | 15 °C | 25.9 °C | 89.92 mm |
| August | 14.1 °C | 25.4 °C | 92.71 mm |
| September | 9.4 °C | 21.3 °C | 92.71 mm |
| October | 3.5 °C | 14.1 °C | 115.57 mm |
| November | -2.2 °C | 7.1 °C | 93.22 mm |
| December | -7.9 °C | 0.7 °C | 89.41 mm |
| Annual | 1.5 °C | 12.3 °C | 1056.9 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |