Greigsville, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.7 °C (low) to 14.1 °C (high). Annual precipitation averages 887 Millimeters. Greigsville is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.6 °C | 0.2 °C | 55.37 mm |
| February | -8.3 °C | 1.2 °C | 43.69 mm |
| March | -4.3 °C | 5.7 °C | 58.67 mm |
| April | 1.7 °C | 13.2 °C | 73.15 mm |
| May | 8.1 °C | 20.3 °C | 78.49 mm |
| June | 13.3 °C | 24.9 °C | 91.19 mm |
| July | 15.8 °C | 27.2 °C | 100.84 mm |
| August | 14.9 °C | 26.3 °C | 88.14 mm |
| September | 11 °C | 22.8 °C | 81.03 mm |
| October | 5.3 °C | 15.8 °C | 87.12 mm |
| November | 0.1 °C | 8.9 °C | 68.33 mm |
| December | -4.7 °C | 3.1 °C | 60.96 mm |
| Annual | 3.7 °C | 14.1 °C | 886.98 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |