Hagaman, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.4 °C (low) to 13.4 °C (high). Annual precipitation averages 1169.4 Millimeters. Hagaman 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 | -10.9 °C | -1.4 °C | 89.66 mm |
| February | -10.2 °C | 0.2 °C | 70.1 mm |
| March | -5.7 °C | 4.9 °C | 87.88 mm |
| April | 0.9 °C | 13.1 °C | 94.49 mm |
| May | 7.4 °C | 19.9 °C | 102.62 mm |
| June | 12.4 °C | 24.4 °C | 118.11 mm |
| July | 15.3 °C | 26.9 °C | 112.52 mm |
| August | 14.3 °C | 26.1 °C | 103.12 mm |
| September | 10.3 °C | 22.1 °C | 103.12 mm |
| October | 3.9 °C | 15.2 °C | 108.2 mm |
| November | -1.8 °C | 7.8 °C | 86.61 mm |
| December | -6.8 °C | 1.6 °C | 92.96 mm |
| Annual | 2.4 °C | 13.4 °C | 1169.39 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |