Greenfield, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.8 °F (low) to 56.6 °F (high). Annual precipitation averages 47 Inches. Greenfield 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 | 12.3 °F | 30.1 °F | 3.47 in. |
| February | 13.4 °F | 32.9 °F | 2.74 in. |
| March | 22.1 °F | 41.6 °F | 3.69 in. |
| April | 34.1 °F | 56.4 °F | 3.92 in. |
| May | 45.9 °F | 68.6 °F | 3.85 in. |
| June | 55.1 °F | 76.5 °F | 4.71 in. |
| July | 60.0 °F | 81.1 °F | 4.73 in. |
| August | 58.4 °F | 79.2 °F | 4.13 in. |
| September | 50.9 °F | 72.1 °F | 3.87 in. |
| October | 39.8 °F | 59.4 °F | 4.39 in. |
| November | 29.7 °F | 46.3 °F | 3.53 in. |
| December | 20.1 °F | 35.2 °F | 3.94 in. |
| Annual | 36.8 °F | 56.6 °F | 46.97 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |