Deferiet, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.6 °F (low) to 54.5 °F (high). Annual precipitation averages 43.7 Inches. Deferiet is located in USDA Plant Hardiness Zone 5a. 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 | 9.3 °F | 27.8 °F | 3.77 in. |
| February | 10.4 °F | 29.5 °F | 2.64 in. |
| March | 20.1 °F | 38.3 °F | 2.8 in. |
| April | 33.1 °F | 52.8 °F | 3.41 in. |
| May | 45.2 °F | 66.1 °F | 3.53 in. |
| June | 54.7 °F | 74.4 °F | 3.7 in. |
| July | 59.9 °F | 79.0 °F | 3.44 in. |
| August | 58.2 °F | 78.1 °F | 3.62 in. |
| September | 50.2 °F | 71.1 °F | 3.76 in. |
| October | 39.1 °F | 58.0 °F | 4.98 in. |
| November | 28.8 °F | 45.3 °F | 4.06 in. |
| December | 18.0 °F | 33.6 °F | 4.01 in. |
| Annual | 35.6 °F | 54.5 °F | 43.72 in. |
| 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |