Mendon, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.2 °C (low) to 14.2 °C (high). Annual precipitation averages 903.7 Millimeters. Mendon is located in USDA Plant Hardiness Zone 6b. 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 °C | 0.3 °C | 64.26 mm |
| February | -7.8 °C | 1.2 °C | 51.05 mm |
| March | -3.8 °C | 5.7 °C | 68.58 mm |
| April | 2.1 °C | 13.2 °C | 74.17 mm |
| May | 8.5 °C | 20.3 °C | 72.9 mm |
| June | 13.8 °C | 25 °C | 86.87 mm |
| July | 16.3 °C | 27.3 °C | 103.12 mm |
| August | 15.4 °C | 26.5 °C | 83.06 mm |
| September | 11.5 °C | 22.8 °C | 76.2 mm |
| October | 5.8 °C | 15.9 °C | 86.61 mm |
| November | 0.4 °C | 9.1 °C | 71.63 mm |
| December | -4.3 °C | 3.3 °C | 65.28 mm |
| Annual | 4.2 °C | 14.2 °C | 903.73 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 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 |