Leicester, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4 °C (low) to 14.5 °C (high). Annual precipitation averages 846.1 Millimeters. Leicester 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 | -8.3 °C | 0.4 °C | 48.26 mm |
| February | -7.9 °C | 1.4 °C | 38.86 mm |
| March | -3.9 °C | 6 °C | 52.32 mm |
| April | 2.1 °C | 13.6 °C | 69.09 mm |
| May | 8.5 °C | 20.7 °C | 76.45 mm |
| June | 13.6 °C | 25.4 °C | 89.92 mm |
| July | 15.9 °C | 27.6 °C | 105.92 mm |
| August | 15.2 °C | 26.8 °C | 87.63 mm |
| September | 11.1 °C | 23.2 °C | 76.71 mm |
| October | 5.4 °C | 16.2 °C | 82.8 mm |
| November | 0.2 °C | 9.2 °C | 64.01 mm |
| December | -4.4 °C | 3.4 °C | 54.1 mm |
| Annual | 4 °C | 14.5 °C | 846.07 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 |