Sheldon, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 12.8 °C (high). Annual precipitation averages 1212.9 Millimeters. Sheldon 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.4 °C | -1.2 °C | 95.5 mm |
| February | -9.4 °C | 0.1 °C | 71.37 mm |
| March | -6.3 °C | 4.4 °C | 94.74 mm |
| April | -0.1 °C | 11.8 °C | 101.35 mm |
| May | 6.6 °C | 18.9 °C | 95.76 mm |
| June | 11.6 °C | 23.4 °C | 112.78 mm |
| July | 13.9 °C | 25.5 °C | 110.24 mm |
| August | 12.4 °C | 25.3 °C | 103.12 mm |
| September | 8.8 °C | 21.8 °C | 105.92 mm |
| October | 3.6 °C | 14.6 °C | 111 mm |
| November | -1.7 °C | 7.5 °C | 112.01 mm |
| December | -6.6 °C | 1.6 °C | 99.06 mm |
| Annual | 1.9 °C | 12.8 °C | 1212.85 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 5b : -26.1°C to -23.3°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 |