Holley, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.6 °C (low) to 14.2 °C (high). Annual precipitation averages 809.5 Millimeters. Holley is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | 0.5 °C | 55.63 mm |
| February | -7.4 °C | 1.3 °C | 45.47 mm |
| March | -3.4 °C | 5.7 °C | 58.67 mm |
| April | 2.3 °C | 13.3 °C | 73.15 mm |
| May | 8.6 °C | 20.1 °C | 74.93 mm |
| June | 14.1 °C | 25 °C | 76.96 mm |
| July | 16.8 °C | 27.2 °C | 77.47 mm |
| August | 16 °C | 26.4 °C | 68.33 mm |
| September | 12.2 °C | 22.8 °C | 76.45 mm |
| October | 6.3 °C | 15.9 °C | 81.03 mm |
| November | 0.8 °C | 9.2 °C | 60.71 mm |
| December | -3.9 °C | 3.3 °C | 60.71 mm |
| Annual | 4.6 °C | 14.2 °C | 809.51 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |