Hamilton, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.9 °F (low) to 56.8 °F (high). Annual precipitation averages 44.9 Inches. Hamilton 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 | 12.6 °F | 30.9 °F | 3.2 in. |
| February | 13.9 °F | 33.4 °F | 2.67 in. |
| March | 21.3 °F | 41.6 °F | 3.58 in. |
| April | 33.1 °F | 55.4 °F | 3.64 in. |
| May | 44.2 °F | 68.3 °F | 3.84 in. |
| June | 53.4 °F | 76.7 °F | 4.56 in. |
| July | 58.0 °F | 80.8 °F | 4.27 in. |
| August | 56.5 °F | 79.1 °F | 4.41 in. |
| September | 49.2 °F | 72.5 °F | 3.87 in. |
| October | 38.8 °F | 59.4 °F | 3.95 in. |
| November | 29.3 °F | 46.9 °F | 3.46 in. |
| December | 20.7 °F | 36.0 °F | 3.43 in. |
| Annual | 35.9 °F | 56.8 °F | 44.88 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 |