Le Roy, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.5 °C (low) to 13.9 °C (high). Annual precipitation averages 921.5 Millimeters. Le Roy is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.8 °C | -0.1 °C | 61.98 mm |
| February | -8.5 °C | 0.9 °C | 47.24 mm |
| March | -4.6 °C | 5.5 °C | 65.28 mm |
| April | 1.4 °C | 12.9 °C | 77.47 mm |
| May | 7.9 °C | 20.1 °C | 80.26 mm |
| June | 13.2 °C | 24.8 °C | 91.44 mm |
| July | 15.6 °C | 26.9 °C | 95.76 mm |
| August | 14.7 °C | 26.3 °C | 87.88 mm |
| September | 10.8 °C | 22.7 °C | 85.34 mm |
| October | 5.2 °C | 15.7 °C | 90.68 mm |
| November | -0.2 °C | 8.8 °C | 70.87 mm |
| December | -4.9 °C | 2.8 °C | 67.31 mm |
| Annual | 3.5 °C | 13.9 °C | 921.51 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |