Clay, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.1 °F (low) to 57 °F (high). Annual precipitation averages 45.4 Inches. Clay is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.0 °F | 31.0 °F | 3.67 in. |
| February | 15.7 °F | 33.2 °F | 3.09 in. |
| March | 23.4 °F | 40.9 °F | 3.42 in. |
| April | 34.8 °F | 55.6 °F | 3.54 in. |
| May | 46.3 °F | 68.4 °F | 3.7 in. |
| June | 55.3 °F | 76.5 °F | 4.03 in. |
| July | 60.0 °F | 81.1 °F | 3.92 in. |
| August | 58.6 °F | 79.8 °F | 3.79 in. |
| September | 51.6 °F | 72.9 °F | 3.78 in. |
| October | 41.6 °F | 59.7 °F | 4.63 in. |
| November | 32.4 °F | 47.7 °F | 3.86 in. |
| December | 22.7 °F | 36.6 °F | 3.94 in. |
| Annual | 38.1 °F | 57 °F | 45.37 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |