Hornby, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.9 °F (low) to 56.2 °F (high). Annual precipitation averages 38 Inches. Hornby is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.4 °F | 30.6 °F | 2.29 in. |
| February | 16.4 °F | 33.1 °F | 1.85 in. |
| March | 22.2 °F | 41.4 °F | 2.79 in. |
| April | 32.8 °F | 55.4 °F | 3.23 in. |
| May | 44.0 °F | 67.7 °F | 3.3 in. |
| June | 53.6 °F | 75.4 °F | 4.18 in. |
| July | 57.5 °F | 79.6 °F | 3.8 in. |
| August | 56.2 °F | 78.1 °F | 3.91 in. |
| September | 49.7 °F | 71.4 °F | 3.96 in. |
| October | 40.6 °F | 59.2 °F | 3.57 in. |
| November | 31.6 °F | 46.3 °F | 2.7 in. |
| December | 22.5 °F | 35.7 °F | 2.46 in. |
| Annual | 36.9 °F | 56.2 °F | 38.04 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 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 |