Sherman, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 13.4 °C (high). Annual precipitation averages 1204.5 Millimeters. Sherman is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.2 °C | -0.6 °C | 89.41 mm |
| February | -8.9 °C | 0.7 °C | 66.04 mm |
| March | -5.1 °C | 5.7 °C | 66.55 mm |
| April | 0.8 °C | 13.1 °C | 86.61 mm |
| May | 6.7 °C | 19.7 °C | 113.03 mm |
| June | 11.6 °C | 24 °C | 112.01 mm |
| July | 13.8 °C | 26.2 °C | 127.51 mm |
| August | 13.1 °C | 25.3 °C | 99.82 mm |
| September | 9.5 °C | 21.8 °C | 121.41 mm |
| October | 3.8 °C | 14.9 °C | 140.21 mm |
| November | -1.2 °C | 8 °C | 91.69 mm |
| December | -5.2 °C | 2.2 °C | 90.17 mm |
| Annual | 2.5 °C | 13.4 °C | 1204.46 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |