Sidney, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 14.5 °C (high). Annual precipitation averages 1104.6 Millimeters. Sidney 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 | -10.3 °C | 0 °C | 73.91 mm |
| February | -9.7 °C | 1.7 °C | 62.99 mm |
| March | -5.9 °C | 6.2 °C | 80.26 mm |
| April | 0.3 °C | 14.3 °C | 90.68 mm |
| May | 6.6 °C | 21.3 °C | 94.49 mm |
| June | 11.6 °C | 25.7 °C | 119.38 mm |
| July | 14.2 °C | 27.9 °C | 109.47 mm |
| August | 13.4 °C | 26.8 °C | 109.98 mm |
| September | 9.6 °C | 22.9 °C | 101.35 mm |
| October | 3.8 °C | 16.1 °C | 100.84 mm |
| November | -1.6 °C | 8.8 °C | 80.52 mm |
| December | -5.9 °C | 2.7 °C | 80.77 mm |
| Annual | 2.2 °C | 14.5 °C | 1104.64 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 |