Clayton, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.3 °C (low) to 12.2 °C (high). Annual precipitation averages 997.5 Millimeters. Clayton is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.3 °C | -2.4 °C | 80.01 mm |
| February | -10.9 °C | -1.3 °C | 62.23 mm |
| March | -5.6 °C | 3.4 °C | 66.29 mm |
| April | 1.6 °C | 10.9 °C | 82.55 mm |
| May | 8.1 °C | 17.8 °C | 81.79 mm |
| June | 13.5 °C | 22.6 °C | 87.12 mm |
| July | 16.7 °C | 25.4 °C | 80.52 mm |
| August | 15.9 °C | 25.2 °C | 83.82 mm |
| September | 11.6 °C | 21.3 °C | 89.92 mm |
| October | 5.8 °C | 14.2 °C | 109.47 mm |
| November | -0.1 °C | 7.6 °C | 89.41 mm |
| December | -6.2 °C | 1.2 °C | 84.33 mm |
| Annual | 3.3 °C | 12.2 °C | 997.46 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |