Hadley, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.1 °F (low) to 56.4 °F (high). Annual precipitation averages 46.6 Inches. Hadley is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.2 °F | 30.0 °F | 3.47 in. |
| February | 12.4 °F | 33.0 °F | 2.82 in. |
| March | 21.5 °F | 41.6 °F | 3.76 in. |
| April | 33.4 °F | 55.9 °F | 4.07 in. |
| May | 45.4 °F | 68.3 °F | 3.85 in. |
| June | 54.4 °F | 76.1 °F | 4.75 in. |
| July | 59.6 °F | 80.7 °F | 4.15 in. |
| August | 57.8 °F | 78.8 °F | 4.06 in. |
| September | 50.3 °F | 71.8 °F | 3.45 in. |
| October | 38.9 °F | 59.1 °F | 4.49 in. |
| November | 28.9 °F | 46.2 °F | 3.63 in. |
| December | 19.3 °F | 35.2 °F | 4.05 in. |
| Annual | 36.1 °F | 56.4 °F | 46.55 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 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 |