Leon, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.3 °C (low) to 13.1 °C (high). Annual precipitation averages 1229.4 Millimeters. Leon is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.4 °C | -0.9 °C | 99.06 mm |
| February | -9.4 °C | 0.3 °C | 70.61 mm |
| March | -5.8 °C | 5.1 °C | 87.38 mm |
| April | 0.3 °C | 12.6 °C | 96.77 mm |
| May | 6.6 °C | 19.3 °C | 96.27 mm |
| June | 11.6 °C | 23.7 °C | 113.28 mm |
| July | 13.8 °C | 25.8 °C | 124.71 mm |
| August | 13.2 °C | 25 °C | 112.01 mm |
| September | 9.6 °C | 21.5 °C | 111.76 mm |
| October | 3.8 °C | 14.6 °C | 111.51 mm |
| November | -1.4 °C | 7.7 °C | 102.62 mm |
| December | -5.6 °C | 1.9 °C | 103.38 mm |
| Annual | 2.3 °C | 13.1 °C | 1229.36 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |