Clayville, 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 13.3 °C (high). Annual precipitation averages 1234.7 Millimeters. Clayville 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 | -10.9 °C | -1.6 °C | 78.23 mm |
| February | -9.3 °C | 0.1 °C | 71.12 mm |
| March | -5.9 °C | 4.3 °C | 88.9 mm |
| April | 1.1 °C | 12.6 °C | 106.17 mm |
| May | 7.4 °C | 19.8 °C | 101.85 mm |
| June | 12.3 °C | 24.7 °C | 123.7 mm |
| July | 14.9 °C | 27.1 °C | 123.95 mm |
| August | 14 °C | 26.2 °C | 114.05 mm |
| September | 9.9 °C | 22.3 °C | 110.24 mm |
| October | 4.1 °C | 15.1 °C | 119.89 mm |
| November | -1.3 °C | 7.6 °C | 101.6 mm |
| December | -6.4 °C | 1.4 °C | 95 mm |
| Annual | 2.5 °C | 13.3 °C | 1234.7 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |