Hamlin, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.9 °C (low) to 14.1 °C (high). Annual precipitation averages 811.5 Millimeters. Hamlin is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.2 °C | 0.7 °C | 56.64 mm |
| February | -6.9 °C | 1.3 °C | 46.74 mm |
| March | -3.2 °C | 5.6 °C | 58.67 mm |
| April | 2.5 °C | 12.9 °C | 71.63 mm |
| May | 8.3 °C | 19.7 °C | 72.39 mm |
| June | 14 °C | 24.4 °C | 77.22 mm |
| July | 17.3 °C | 27 °C | 78.23 mm |
| August | 16.6 °C | 26.4 °C | 69.85 mm |
| September | 12.8 °C | 22.7 °C | 75.95 mm |
| October | 6.7 °C | 15.9 °C | 80.26 mm |
| November | 1.2 °C | 9.4 °C | 62.23 mm |
| December | -3.6 °C | 3.7 °C | 61.72 mm |
| Annual | 4.9 °C | 14.1 °C | 811.53 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |