Henderson, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.8 °F (low) to 54.4 °F (high). Annual precipitation averages 44.9 Inches. Henderson 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 | 14.1 °F | 29.1 °F | 4.12 in. |
| February | 15.0 °F | 30.7 °F | 3.13 in. |
| March | 23.1 °F | 38.7 °F | 3.06 in. |
| April | 35.0 °F | 51.6 °F | 3.54 in. |
| May | 46.4 °F | 63.9 °F | 3.44 in. |
| June | 56.1 °F | 72.8 °F | 3.56 in. |
| July | 62.2 °F | 77.8 °F | 3.37 in. |
| August | 61.1 °F | 77.8 °F | 3.6 in. |
| September | 53.7 °F | 71.1 °F | 3.84 in. |
| October | 43.1 °F | 57.8 °F | 4.81 in. |
| November | 32.8 °F | 46.3 °F | 4.17 in. |
| December | 22.4 °F | 35.3 °F | 4.24 in. |
| Annual | 38.8 °F | 54.4 °F | 44.88 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 |